UNITED HEALTHCARE CORP
S-3, 1997-12-05
HOSPITAL & MEDICAL SERVICE PLANS
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<PAGE>
 
    As filed with the Securities and Exchange Commission on December 5, 1997

                                                   Registration No. 333-________
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                        

                                    FORM S-3
                             REGISTRATION STATEMENT
                                     Under
                           The Securities Act of 1933
                                        

                         UNITED HEALTHCARE CORPORATION
             (Exact name of registrant as specified in its charter)

           Minnesota                                 41-1321939
(State or other jurisdiction of          (I.R.S Employer Identification No.)
incorporation or organization)

                                300 Opus Center
                              9900 Bren Road East
                          Minnetonka, Minnesota 55343
                                 (612) 936-1300
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

 
         David J. Lubben               Copy to:       James D. Alt
  United HealthCare Corporation                   Dorsey & Whitney LLP
         300 Opus Center                         Pillsbury Center South
       9900 Bren Road East                        220 South Sixth Street
    Minnetonka, Minnesota 55343                   Minneapolis, MN 55402
         (612) 936-1300                               (612) 340-6323

 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                                        

  Approximate date of commencement of proposed sale to the public:  From time to
time after the effective date of this Registration Statement.

  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / /

  If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  /x/

  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.   / /

  If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
========================================================================================== 
                                               Proposed       Proposed
        Title of Each          Amount          Maximum         Maximum        Amount of
      Class of Securities      to be        Offering Price    Aggregate     Registration
       to be Registered     Registered(#)      Per Share*   Offering Price*      Fee
      <S>                    <C>            <C>             <C>              <C>
- ------------------------------------------------------------------------------------------
      Common Stock
      ($.01 par value)        263,032       $52.8125        $13,891,377.50     $4,097.96
========================================================================================== 
</TABLE> 
 
*    Estimated solely for purposes of computing the registration fee and based
     upon the average of the high and low sales prices for such Common Stock on
     December 2, 1997, as reported on the New York Stock Exchange.
 

  THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT
SHALL HEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF THE
SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.
<PAGE>
 
                             SUBJECT TO COMPLETION

                 PRELIMINARY PROSPECTUS DATED DECEMBER 5, 1997
                                        

                        UNITED HEALTHCARE CORPORATION
                                  __________
                                        
                                263,032 Shares
                                      OF
                                 COMMON STOCK
                               ($.01 PAR VALUE)
                                  __________


     This Prospectus relates to an aggregate of 263,032 shares (the "Shares") of
Common Stock, par value $.01 per share (the "Common Stock"), of United
HealthCare Corporation, a Minnesota corporation ("United HealthCare"), that may
be sold from time to time by the shareholders named herein (the "Selling
Shareholders").  See "SELLING SHAREHOLDERS."  United HealthCare will not receive
any proceeds from the sale of the Shares.  United HealthCare has agreed to pay
the expenses of registration of the Shares, including legal and accounting fees.

     Any or all of the Shares may be offered from time to time in transactions
on the New York Stock Exchange in brokerage transactions at prevailing market
prices or in transactions at negotiated prices.  See "PLAN OF DISTRIBUTION."

     The Common Stock is traded on the New York Stock Exchange.  On December 2,
1997, the last sale price of the Common Stock as reported on the New York Stock
Exchange was $52.875 per share.

                                  __________

        SEE "RISK FACTORS" ON PAGE 4 FOR A DISCUSSION OF CERTAIN RISKS
     PROSPECTIVE PURCHASERS OF THE SHARES OFFERED HEREBY SHOULD CONSIDER.
                                  __________

   THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED  BY THE SECURITIES
         AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR
            HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE
               SECURITIES COMMISSION PASSED UPON THE ACCURACY OR
                ADEQUACY OF THIS PROSPECTUS.  ANY REPRESENTATION
                     TO THE CONTRARY IS A CRIMINAL OFFENSE.
                                  __________

     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH
THE OFFER CONTAINED HEREIN, AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY UNITED
HEALTHCARE.  THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A
SOLICITATION OF AN OFFER TO BUY, ANY SECURITIES OFFERED HEREBY IN ANY
JURISDICTION IN WHICH IT IS NOT LAWFUL OR TO ANY PERSON TO WHOM IT IS NOT LAWFUL
TO MAKE ANY SUCH OFFER OR SOLICITATION.  NEITHER THE DELIVERY OF THIS PROSPECTUS
NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT INFORMATION HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE
DATE HEREOF.

               The date of this Prospectus is ____________, 1997.

                                        
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL NOR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
 
                             AVAILABLE INFORMATION

     United HealthCare is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information
with the Securities and Exchange Commission (the "Commission"). Such reports,
proxy statements and other information filed by United HealthCare can be
inspected and copied at the public reference facilities of the Commission at
450 Fifth Street, N.W., Washington, D.C. 20549, and at the Commission's
regional offices at 7 World Trade Center, Suite 1300, New York, New York 10048
and CitiCorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661. Copies of such materials can be obtained from the Public Reference
Section of the Commission at 450 Fifth Street, N.W., Washington, D.C. 20549,
at prescribed rates. In addition, the Common Stock of United HealthCare is
listed on the New York Stock Exchange, and reports, proxy statements and other
information concerning United HealthCare can also be inspected at such
exchange. This Prospectus does not contain all the information set forth in
the Registration Statement and exhibits thereto which United HealthCare has
filed with the Commission under the Securities Act of 1933, as amended (the
"Securities Act"), and to which reference is hereby made. The Commission
maintains a site on the World Wide Web that contains reports, proxy and
information statements and other information regarding issuers that file
electronically with the Commission. The address of such site is
http://www.sec.gov.


                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents of United HealthCare which have been filed with the
Commission are hereby incorporated by reference in this Prospectus:

          (a) the Annual Report on Form 10-K for the year ended December 31,
     1996, as amended by Form 10-K/A filed on June 16, 1997;

          (b) the Quarterly Reports on Form 10-Q for the quarters ended March
     31, 1997, June 30, 1997 and September 30, 1997; and

          (c) the description of the Common Stock contained in the Registration
     Statement on Form 8-A dated September 20, 1992, and any amendment or report
     filed for the purpose of updating such description filed subsequent to the
     date of this Prospectus and prior to the termination of the offering
     described herein.

     All documents filed by United HealthCare pursuant to Section 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the termination of the offering of the Common Stock shall be deemed to
be incorporated by reference into this Prospectus and to be a part hereof from
the respective dates of filing of such documents.  Any statement contained
herein or in a document all or part of which is incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement.  Any
such statement so modified or superseded shall not be deemed, except as so
modified or superseded, to constitute a part of this Prospectus.

     United HealthCare will provide without charge to any person to whom this
Prospectus is delivered, upon the written or oral request of such person, a copy
of any or all of the foregoing documents incorporated herein by reference (other
than certain exhibits to such documents).  Requests for such copies should be
directed to David J. Lubben, Secretary and General Counsel, United HealthCare
Corporation, 300 Opus Center, 9900 Bren Road East, Minnetonka, Minnesota 55343,
telephone number (612) 936-1300.

                                      -2-
<PAGE>
 
                         UNITED HEALTHCARE CORPORATION


     United HealthCare is a leader in offering health care coverage and related
services through a broad continuum of products and services nationwide.  United
HealthCare's products and services reflect a number of core capabilities,
including medical information management, health benefit administration, risk
assessment and pricing, health benefit design and provider contracting and risk
sharing.  With these capabilities, United HealthCare's operating subsidiaries
are able to provide comprehensive managed care services, such as health
maintenance organizations, preferred provider organizations, and insured and
self-funded health care coverage products.  United HealthCare also offers
unbundled health care management and cost containment products such as
behavioral health services, utilization review services, specialized provider
networks and employee assistance programs.
 
   The principal executive offices of United HealthCare are located at 300 Opus
Center, 9900 Bren Road East, Minnetonka, Minnesota 55343, and the telephone
number is (612) 936-1300.

                                      -3-
<PAGE>
 
                                  RISK FACTORS

     The statements contained in this Prospectus include forward-looking
statements within the meaning of the Private Securities Litigation Reform Act of
1995 (the "PSLRA").  When used in this Prospectus, in filings by United
HealthCare with the Commission, in United HealthCare's press releases,
presentations to securities analysts and investors, and in oral statements made
by or with the approval of an executive officer of United HealthCare, the words
or phrases "believes," "anticipates," "intends," "will likely result,"
"estimates," "projects" or similar expressions are intended to identify such
forward-looking statements.  Any of these forward-looking statements involve
risks and uncertainties that may cause United HealthCare's actual results to
differ materially from the results discussed in the forward-looking statements.

     The following discussion contains certain cautionary statements regarding
United HealthCare's business and results of operations.  These statements
discuss matters which may in part be discussed elsewhere in this Prospectus and
which may have been discussed in other documents prepared by United HealthCare
pursuant to federal or state securities laws.  This discussion is intended to
take advantage of the "safe harbor" provisions of the PSLRA.  In making these
cautionary statements, United HealthCare is not undertaking to address or update
each factor in future filings with the Commission or communications regarding
United HealthCare's business or results, and is not undertaking to address how
any of these factors may have caused results to differ from discussions or
information contained in previous filings or communications.  In addition, any
of the matters discussed below may have affected United HealthCare's past, as
well as current, forward-looking statements about future results, so that United
HealthCare's actual results in the future may differ materially from those
expressed in prior communications.

HEALTH CARE COSTS

     A large portion of the revenue received by United HealthCare is used to pay
the costs of health care services or supplies delivered to its enrollees.  The
total health care costs incurred by United HealthCare are affected by the number
of individual services rendered and the cost of each service.  Much of United
HealthCare's premium revenue is set in advance of the actual delivery of
services and the related incurrence of the cost, usually on a prospective annual
basis.  While United HealthCare attempts to base the premiums it charges at
least in part on its estimate of future health care costs over the fixed premium
period, competition, regulations and other circumstances may limit United
HealthCare's ability to fully base premiums on estimated costs.  In addition,
many factors may and often do cause actual health care costs to exceed that
estimated and reflected in premiums.  These factors may include increased
utilization of services, increased cost of individual services, catastrophes,
epidemics, the introduction of new or costly treatments, general inflation, new
mandated benefits or other regulatory changes and insured population
characteristics.  In addition, United HealthCare's earnings as reported for any
particular quarter include estimates of covered services incurred by United
HealthCare's enrollees during that period but for which a claim has not been
received or processed.  These are estimates and therefore, United HealthCare's
earnings may be subject to later adjustment based on the actual costs.

     In addition, as a result of changes in the level of health care utilization
during the calendar year, United HealthCare's operating results may be affected
by the seasonal nature of medical costs.  Although there are no assurances, per-
member medical costs generally have been higher in the first half of a year than
the second half.

INDUSTRY FACTORS

     The managed care industry has recently received significant amounts of
negative publicity.  This publicity, in turn, has contributed to increased
legislative activity, regulation and review of industry practices.  These
factors may adversely affect United HealthCare's ability to market its

                                      -4-
<PAGE>
 
products or services, could necessitate changes in United HealthCare's products
and services, and may increase the regulatory burdens under which United
HealthCare operates, further increasing the costs of doing business and
adversely affecting profitability.

COMPETITION

     In any of its geographic or product markets United HealthCare competes with
a number of other entities, some of which may have certain characteristics or
capabilities which give them an advantage in competing with United HealthCare.
United HealthCare believes the barriers to entry in these markets are not
substantial, so that the addition of new competitors can occur relatively
easily.  Certain of United HealthCare's customers may decide to perform for
themselves functions or services formerly provided by United HealthCare, which
would result in a decrease in United HealthCare's revenues.  Certain of United
HealthCare's providers may decide to market products and services to United
HealthCare customers in competition with United HealthCare.  In addition,
significant merger and acquisition activity has occurred in the industry in
which United HealthCare operates as well as in industries which act as suppliers
to United HealthCare, such as the hospital, physician, pharmaceutical and
medical device industries.  This activity may create stronger competitors or
result in higher health care costs.  To the extent that there is strong
competition or that competition intensifies in any market, United HealthCare's
ability to retain or increase customers, its revenue growth, its pricing
flexibility, its control over medical cost trends and its marketing expenses may
all be adversely affected.

AARP CONTRACT

     In early 1997, United HealthCare finalized its contract arrangements with
the American Association of Retired Persons ("AARP") under which United
HealthCare will provide Medicare supplement and hospital indemnity health
insurance products to AARP members, effective January1, 1998.  As a result of
this agreement, United HealthCare will significantly expand the number of
members served, the products offered and the services provided.  The success of
the AARP arrangement will depend, in part, on United HealthCare's ability to
service these new members, develop additional products and services and price
the products and services competitively.

GOVERNMENT PROGRAMS AND REGULATION

     United HealthCare's business is heavily regulated on a federal, state and
local level.  The laws and rules governing United HealthCare's business and
interpretations of those laws and rules are subject to frequent change and broad
latitude is given to the agencies administering those regulations.  Existing or
future laws and rules could force United HealthCare to change how it does
business, may restrict United HealthCare's revenue and enrollment growth,
increase its health care and administrative costs, and increase United
HealthCare's liability for medical malpractice or other actions.  Regulatory
approvals must be obtained and maintained to market many of United HealthCare's
products and services.  Delays in obtaining or failure to obtain or maintain
such approvals could adversely affect United HealthCare's revenue or the number
of covered lives, or could increase costs.  A significant portion of United
HealthCare's revenues relate to federal, state and local government health care
coverage programs.  These types of programs, such as the federal Medicare
program and the federal and state Medicaid program, are generally subject to
frequent change, including changes which may reduce the number of persons
enrolled or eligible, reduce the revenue received by United HealthCare or
increase United HealthCare's administrative or health care costs under such
programs.  Such changes have in the past and may in the future adversely affect
United HealthCare's results and its willingness to participate in such programs.

     United HealthCare is also subject to various governmental audits and
investigations.  Such activities could result in the loss of licensure or the
right to participate in certain programs, or the imposition of fines, penalties
and other sanctions.  In addition, disclosure of any adverse investigation

                                      -5-
<PAGE>
 
or audit results or sanctions could negatively affect United HealthCare's
reputation in various markets and make it more difficult for United HealthCare
to sell its products and services.

     The National Association of Insurance Commissioners (the "NAIC") has an
effort underway that would impose new minimum capitalization requirements for
health care coverage provided by insurance companies, HMOs and other risk
bearing health care entities.  The requirements would take the form of risk-
based capital rules.  Currently, similar rules apply only to insurance
companies.  There could be an increase in the capital required for certain of
United HealthCare's subsidiaries and there may be some potential for disparate
treatment relative to competing products.  Failure of the NAIC to act may result
in some form of federal solvency regulation of companies providing Medicare-
related benefit programs.

PROVIDER RELATIONS

     One of the significant techniques United HealthCare uses to manage health
care costs and utilization and monitor the quality of care being delivered is
contracting with physicians, hospitals and other providers.  Because of the
geographic diversity of its health plans and the large number of providers with
which most of those health plans contract, United HealthCare currently believes
it has a limited exposure to provider relations issues.  In any particular
market, however, providers could refuse to contract with United HealthCare,
demand higher payments or take other actions which could result in higher health
care costs, less desirable products for customers and members or difficulty
meeting regulatory or accreditation requirements.

     In some markets, certain providers, particularly hospitals,
physician/hospital organizations or multi-specialty physician groups, may have
significant market positions or near monopolies.  In addition, physician or
practice management companies which aggregate physician practices for purposes
of administrative efficiency and marketing leverage, continue to expand.  These
providers may compete directly with United HealthCare.  If such providers refuse
to contract with United HealthCare, use their market position to negotiate
favorable contracts, or place United HealthCare at a competitive disadvantage,
United HealthCare's ability to market products or to be profitable in those
areas could be adversely affected.

LITIGATION AND INSURANCE

     United HealthCare may be a party to a variety of legal actions to which any
corporation may be subject, including employment and employment discrimination-
related suits, employee benefit claims, breach of contract actions, tort claims,
stockholder suits (including for securities fraud), and intellectual property
related litigation.  In addition, because of the nature of its business, United
HealthCare is subject to a variety of legal actions relating to its business
operations, such as claims relating to the denial of health care benefits,
medical malpractice actions, provider disputes, including disputes over withheld
compensation and termination of provider contracts disputes related to self-
funded business, including actions alleging claim administration errors and the
failure to disclose network rate discounts and other fee and rebate
arrangements, disputes over copayment calculations, and claims relating to
customer audits and contract performance.  Recent court decisions and
legislative activity may have the effect of increasing United HealthCare's
exposure for any of these types of claims.  In some cases, substantial non-
economic or punitive damages may be sought.  While United HealthCare currently
has insurance coverage for some of these potential liabilities, others may not
be covered by insurance, the insurers may dispute coverage or the amount of
insurance may not be enough to cover the damages awarded.  In addition, certain
types of damages, such as punitive damages, may not be covered by insurance and
insurance coverage for all or certain forms of liability may become unavailable
or prohibitively expensive in the future.

                                      -6-
<PAGE>
 
INFORMATION SYSTEMS

     United HealthCare's business is significantly dependent on effective
information systems, and United HealthCare has many different information
systems for its various businesses. United HealthCare's information systems
require an ongoing commitment of resources to maintain and enhance existing
systems and develop new systems. As a result of United HealthCare's acquisition
activities, United HealthCare is in the process of attempting to reduce the
number of systems and also to upgrade and expand its information systems
capabilities. Failure to maintain effective and efficient information systems
could result in loss of existing customers, difficulty in attracting new
customers, customer and provider disputes, regulatory problems, increases in
administrative expenses or other adverse consequences. In addition, United
HealthCare may from time to time obtain significant portions of its systems-
related or other services or facilities from independent third parties, which
may make United HealthCare's operations vulnerable to such third parties'
failure to perform adequately.

THE YEAR 2000

     United HealthCare is in the process of modifying its computer systems to
accommodate the year 2000 so as not adversely to affect its operations.  United
HealthCare is expensing the costs incurred to make these modifications.  The
inability of United HealthCare to complete timely its year 2000 modifications or
the inability of other companies with which United HealthCare does business to
complete timely their year 2000 modifications could adversely affect United
HealthCare's business.

ADMINISTRATION AND MANAGEMENT

     Efficient and cost-effective administration of United HealthCare's
operations is integral to United HealthCare's profitability and competitive
positioning.  While United HealthCare attempts to effectively manage such
expenses, increases in staff-related and other administrative expenses may occur
from time-to-time due to business or product start-ups or expansions, growth or
changes in business, acquisitions, regulatory requirements or other reasons.
United HealthCare recently announced a reorganization of its operations into six
business units, which reorganization could impose additional administrative
expenses.  Such expense increases are not clearly predictable and increases in
administrative expenses may adversely affect results.

     United HealthCare currently believes it has a relatively experienced,
capable management staff.  The market for management personnel in the healthcare
industry is very competitive.  Loss of certain managers or a number of such
managers could adversely affect United HealthCare's ability to administer and
manage its business.

MARKETING

     United HealthCare markets its products and services through both employed
sales people and independent sales agents.  Although United HealthCare has a
number of such sales employees and agents, if certain key sales employees or
agents or a large subset of such individuals were to leave United HealthCare,
its ability to retain existing customers and members could be impaired.  In
addition, certain of United HealthCare's customers or potential customers
consider rating, accreditation or certification of United HealthCare by various
private or governmental bodies or rating agencies necessary or important.
Certain of United HealthCare's health plans or other business units may not have
obtained or may not desire or be able to obtain or to maintain such
accreditation or certification which could adversely affect United HealthCare's
ability to obtain or retain business with such customers.

                                      -7-
<PAGE>
 
ACQUISITIONS

     United HealthCare has made several large acquisitions in recent years and
has an active, ongoing acquisition program.  These acquisitions may entail
certain risks and uncertainties in addition to those present in its ongoing
business operations, unknown liabilities, unforseen administrative needs, or
increased efforts to integrate the acquired operations.  Failure to identify
liabilities, to anticipate additional administrative needs or to integrate
effectively acquired operations could result in reduced revenues, increased
administrative and other costs, or customer confusion or dissatisfaction.

STOCK MARKET


     The market prices of the securities of certain of the publicly-held
companies in the industry in which United HealthCare operates have shown
volatility and sensitivity in response to many factors, including general market
trends, public communications regarding managed care, legislative or regulatory
actions, health care cost trends, pricing trends, competition, earnings or
membership reports of particular industry participants, and acquisition
activity. There can be no assurances regarding the level or stability of United
HealthCare's share price at any time or of the impact of these or any other
factors on the share price.

                                        

                                      -8-
<PAGE>
 
                              SELLING SHAREHOLDERS

     The following table sets forth certain information as to the maximum number
of Shares that may be sold by each of the Selling Shareholders pursuant to this
Prospectus.

<TABLE>
<CAPTION>
 
                                                   Number         Maximum           Number
                                                  of Shares        Number         of Shares
                                                Beneficially   of Shares to be   Beneficially
                                                 Owned Prior  Sold Pursuant to   Owned After
                Name                             to Offering   this Prospectus    Offering(1)
- -------------------------------------------     ------------  ----------------   ------------
<S>                                             <C>           <C>                <C>
 
Reden & Anders Data Systems
 Limited Partnership                               131,040         131,040            0
Jonathan C. Javitt                                  99,664          99,664            0
Lisa Kolker Max                                     13,634          13,634            0
Michael Shulman                                      2,070           2,070            0
Graham, Hamilton & Company, Inc.                     1,873           1,873            0
David & Susan Greenberg (as joint tenants)           1,189           1,189            0
Peter Bruck                                          1,189           1,189            0
Dr. Richard Gerber                                   1,189           1,189            0
Greenspring Fund                                       804             804            0
James H. S. Cooper, Esq.                               727             727            0
Lee Kolker Crippen & Danny L. Crippen                                        
 (as joint tenants)                                    594             594            0
Drs. Travers, Lazarus, Levitt & Burke                                        
 Employee Benefit Trust                                594             594            0
Irvin Kolker                                           594             594            0
Robert D. Lerner                                       594             594            0
Robert Knoll                                           594             594            0
Mel Katten                                             594             594            0
Dr. William B. Wolf, III                               594             594            0
Nick Ryan                                              594             594            0
Dr. Allen Cohen                                        594             594            0
Franky Myers, AVP Trust Services,                                            
 Chevy Chase FSB c/f IRA Susan Segal                   527             527            0
Steven Smith                                           504             504            0
Dr. Allan M. Lazarus & Judith E.                                             
 Sprei (as joint tenants)                              479             479            0
Dr. Ann B. Burke                                       359             359            0
Dr. Kenneth Travers                                    359             359            0
John F. Dini & Leila A. Dini (as joint tenants)        299             299            0
Frances Kolker                                         299             299            0
Dr. Robert H. Levitt                                   268             268            0
Mara K. Gandal Trust                                                         
 Larry N. Gandal, Esq., Trustee                        150             150            0
Michael J. Gandal Trust                                                      
 Larry N. Gandal, Esq., Trustee                        150             150            0
Lisa Guyer                                              90              90            0
Geoffrey T. Galbraith                                   90              90            0
Allison Loughlin                                        90              90            0
Sara Mettrick                                           90              90            0
Daniel Javitt                                           90              90            0
Fang Wang                                               90              90            0
Qin Wang                                                90              90            0

</TABLE>

                                      -9-
<PAGE>
 
<TABLE>
<CAPTION>
 
                                                   Number         Maximum           Number
                                                  of Shares        Number         of Shares
                                                Beneficially   of Shares to be   Beneficially
                                                 Owned Prior  Sold Pursuant to   Owned After
       Name                                      to Offering   this Prospectus    Offering(1)
- -------------------------------------------     ------------  ----------------   ------------
<S>                                             <C>           <C>                <C>

Gail Javitt                                             90              90            0
Joel Javitt                                             90              90            0
Peter J. McDonnell                                      90              90            0
John Costello                                           13              13            0
- -------------------------------
</TABLE>

(1) Assumes the sale of all Shares covered by this Prospectus.


                              PLAN OF DISTRIBUTION

     The Shares will be offered and sold by the Selling Shareholders for their
own accounts.  United HealthCare will not receive any proceeds from the sale of
the Shares pursuant to this Prospectus.  United HealthCare is registering the
Shares pursuant to its obligations under a registration rights agreement, but
the registration of the Shares does not necessarily mean that any of the Shares
will be offered or sold by the Selling Shareholders.  United HealthCare has
agreed to pay the expenses of registration of the Shares, including legal and
accounting fees.

     The Selling Shareholders, or their pledgees, donees, transferees or other
successors in interest, may offer and sell the Shares from time to time in
transactions on the New York Stock Exchange or other exchanges on which the
Common Stock is then traded or in the over-the-counter market, in brokerage
transactions at prevailing market prices or in transactions at negotiated
prices.  Sales may be made to or through brokers or dealers who may receive
compensation in the form of discounts, concessions or commissions from the
Selling Shareholders or the purchasers of Shares for whom such brokers or
dealers may act as agent or to whom they may sell as principal, or both.  As of
the date of this Prospectus, United HealthCare is not aware of any agreement,
arrangement or understanding between any broker or dealer and the Selling
Shareholders.  In addition, any securities covered by this Prospectus which
qualify for sale pursuant to Rule 144 may be sold under Rule 144 rather than
pursuant to this Prospectus.

     Whenever a particular offering of Shares is to be made pursuant to this
Prospectus, to the extent required, this Prospectus will be updated to reflect
the name of the Selling Shareholders for whose account Shares are to be so
offered, the number of Shares so offered for such Selling Shareholder's account
and, if such offering is to be made by or through underwriters or dealers, the
names of such underwriters or dealers and the principal terms of the
arrangements between the underwriters or dealers and those Selling Shareholders
for whose account such offering is being made.

     The Selling Shareholders and any brokers or dealers acting in connection
with the sale of the Shares hereunder may be deemed to be "underwriters" within
the meaning of Section 2(11) of the Securities Act, and any commissions received
by them and any profit realized by them on the resale of Shares as principals
may be deemed underwriting compensation under the Securities Act.

                                      -10-
<PAGE>
 
                                    EXPERTS

     The consolidated balance sheets as of December 31, 1996 and 1995, and the
consolidated statements of operations, shareholders' equity and cash flows for
each of the three years in the period ended December 31, 1996, of United
HealthCare Corporation incorporated by reference in this Prospectus have been
audited by Arthur Andersen LLP, independent public accountants, as indicated in
their report with respect thereto, which is incorporated herein by reference in
reliance upon the authority of said firm as experts in giving said report.

     With respect to the unaudited interim financial information of United
HealthCare Corporation for the quarters ended March 31, 1997, June 30, 1997 and
September 30, 1997 incorporated by reference in this Prospectus, Arthur Andersen
LLP has applied limited procedures in accordance with professional standards for
a review of that information. However, their separate report thereon states that
they did not audit and they do not express an opinion on that interim financial
information. Accordingly, the degree of reliance on their reports on that
information should be restricted in light of the limited nature of the review
procedures applied. In addition, the accountants are not subject to the
liability provisions of Section 11 of the Securities Act for their reports on
the unaudited interim financial information because these reports are not
"reports" or "parts" of the Prospectus prepared or certified by the accountants
within the meaning of Sections 7 and 11 of the Securities Act.


                                 LEGAL MATTERS

    The validity of the Shares offered hereby has been passed upon for United
HealthCare by the General Counsel of United HealthCare.

                                      -11-
<PAGE>
 
                                    PART II.
                                        
                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

<TABLE>
<CAPTION>
 
<S>                                  <C>
     SEC Registration Fee..........  $ 4,098
     Accounting Fees and Expenses..  $10,000
     Legal Fees and Expenses.......  $20,000
                                     -------
          Total....................  $34,098
</TABLE>

     All fees and expenses other than the Commission registration fee are
estimated.  The expenses listed above will be paid by United HealthCare.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 302A.521 of the Minnesota Business Corporation Act provides that a
corporation shall indemnify any person who was or is made or is threatened to be
made a party to any proceeding, by reason of the former or present official
capacity (as defined) of such person, against judgments, penalties, fines,
settlements and reasonable expenses, including attorneys' fees and
disbursements, incurred by such person in connection with the proceeding if
certain statutory standards are met.  "Proceeding" means a threatened, pending
or complete civil, criminal, administrative, arbitration or investigative
proceeding, including one by or in the right of the corporation.  Section
302A.521 contains detailed terms regarding such right of indemnification and
reference is made thereto for a complete statement of such indemnification
rights.

     United HealthCare's Bylaws provide for the indemnification of such persons,
for such expenses and liabilities, in such manner, under such circumstances and
to such extent of permitted by Section 302A.521 of the Minnesota Business
Corporation Act.

     United HealthCare  maintains a standard policy of officers' and directors'
insurance.

ITEM 16.  LIST OF EXHIBITS

     5     Opinion of the General Counsel of United HealthCare.

     23.1  Consent of Arthur Andersen  LLP

     23.2  Consent of the General Counsel of United HealthCare (included in
           Exhibit 5 to this Registration Statement)

     24    Power of Attorney

ITEM 17.  UNDERTAKINGS

     The undersigned registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
     made, a post-effective amendment to this registration statement:

               (i) To include any prospectus required by section 10(a)(3) of the
          Securities Act of 1933;

                                      II-1
<PAGE>
 
               (ii) To reflect in the prospectus any facts or events arising
          after the effective date of the registration statement (or most recent
          post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the registration statement.  Notwithstanding the foregoing, any
          increase or decrease in volume of securities offered (if the total
          dollar value of securities offered would not exceed that which was
          registered) and any deviation from the low or high end of the
          estimated maximum offering range may be reflected in the form of
          prospectus filed with the Commission pursuant to Rule 424(b) if, in
          the aggregate, the changes in volume and price represent no more than
          a 20% change in the maximum aggregate offering price set forth in the
          "Calculation of Registration Fee" table in the effective registration
          statement;

               (iii)  To include any material information with respect to the
          plan of distribution not previously disclosed in the registration
          statement or any material change to such information in the
          registration statement;

          Provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if
          the information required to be included in a post-effective amendment
          by those paragraphs is contained in periodic reports filed by the
          registrant pursuant to section 13 or section 15(d) of the Securities
          Exchange Act of 1934 that are incorporated by reference in the
          registration statement.

          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in the registration statement shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers, and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that, in the opinion of the Securities and Exchange Commission,
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
liabilities (other than the payment by the registrant of expenses incurred or
paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

                                      II-2
<PAGE>
 
                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Minnetonka, State of Minnesota, on December 5, 1997.

                                    UNITED HEALTHCARE CORPORATION


                                    By   /s/ David J. Lubben
                                       -------------------------------------
                                       David J. Lubben, Secretary

     Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities indicated on December 5, 1997.

          Signature                       Title
          ---------                       -----

  /s/ William W. McGuire        President, Chief Executive Officer and Director
- -----------------------------   (principal executive officer)
  William W. McGuire, M.D. 


   /s/ David P. Koppe           Chief Financial Officer (principal financial
- -----------------------------   officer and principal accounting officer)
      David P. Koppe       


            *                    Director
- -----------------------------
    William C. Ballard, Jr.


            *                    Director
- -----------------------------
      Richard T. Burke


            *                    Director
- -----------------------------
      James A. Johnson


                                 Director
- -----------------------------
       Thomas H. Kean


            *                    Director
- -----------------------------
    Douglas W. Leatherdale


            *                    Director
- -----------------------------
     Walter F. Mondale


            *                    Director
- -----------------------------
     Mary O. Mundinger



            *                    Director
- -----------------------------
       Robert L. Ryan


            *                    Director
- -----------------------------
     Kennett L. Simmons


            *                    Director
- -----------------------------
     William G. Spears


            *                    Director
- -----------------------------
      Gail R. Wilensky


*By   /s/ David J. Lubben
- -----------------------------
       David J. Lubben
     As Attorney-In-Fact

                                      II-3

<PAGE>
 
                                                                       Exhibit 5


                   [United HealthCare Corporation Letterhead]



     Re:  Registration Statement on Form S-3

Ladies and Gentlemen:

     As General Counsel of United HealthCare Corporation, a Minnesota
corporation (the "Company"), I am familiar with the affairs of the Company.
This opinion is being delivered in connection with a Registration Statement on
Form S-3 (the "Registration Statement") to be filed with the Securities and
Exchange Commission under the Securities Act of 1933, as amended, relating to
the sale of 263,032 shares (the "Shares") of common stock of the Company, par
value $.01 per share, which will be sold from time to time by the persons named
in the Registration Statement (the "Selling Shareholders"), on the New York
Stock Exchange or otherwise, directly or through underwriters, brokers or
dealers.

     In connection with this opinion, I or my staff have examined such documents
and have reviewed such questions of law as we have considered necessary and
appropriate for the purposes of our opinions set forth below.  In rendering our
opinions set forth below, we have assumed the legal capacity for all purposes
relevant hereto of all natural persons and, with respect to all parties to
agreements or instruments relevant hereto other than the Company, that such
parties had the requisite power and authority (corporate or otherwise) to
execute, deliver and perform such agreements or instruments, that such
agreements or instruments have been duly authorized by all requisite action
(corporate or otherwise), executed and delivered by such parties and that such
agreements or instruments are the valid, binding and enforceable obligations of
such parties.

     Based on the foregoing, I am are of the opinion that the Shares to be sold
by the Selling Shareholders pursuant to the Registration Statement are duly
authorized by all requisite corporate action, validly issued, fully paid and
nonassessable.

     My opinions expressed above are limited to the laws of the State of
Minnesota.

     I hereby consent to the filing of this opinion as an exhibit to the
Registration Statement, and to the reference to this opinion under the heading
"Legal Matters" in the Prospectus constituting part of the Registration
Statement.

Dated: December 5, 1997


                                    Very truly yours,



                                    /s/ David J. Lubben

<PAGE>
 
                                                                    Exhibit 23.1


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

     As independent public accountants, we hereby consent to the incorporation
by reference in this Registration Statement on Form S-3 of our report dated
February 28, 1997 incorporated by reference in United HealthCare Corporation's
Annual Report on Form 10-K for the year ended December 31, 1996 and to all
references to our firm included in this Registration Statement.

                                    ARTHUR ANDERSEN LLP


Minneapolis, Minnesota
December 4, 1997

<PAGE>
 
                                                                      Exhibit 24


                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben, his true and
lawful attorneys-in-fact and agents, with full powers of substitution and
resubstitution, for him and in his name, place and stead, in any and all
capacities to execute a Registration Statement on Form S-3 to be filed under the
Securities Act of 1933, as amended, for the registration of the resale by
certain shareholders of United HealthCare as expressly named in such
Registration Statement of 263,032 shares of Common Stock of United HealthCare
Corporation, and any and all post-effective amendments thereto, and to file the
same, with all exhibits thereto, and other documents in connection therewith,
with the Securities and Exchange Commission, granting unto said attorneys-in-
fact and agents full power and authority to do and perform to all intents and
purposes as he might or could do in person, hereby ratifying and confirming all
that said attorneys-in-fact and agents, or their substitutes, may lawfully do or
cause to be done by virtue hereof.

Dated: December 5, 1997
       

                                                   /s/ William W. McGuire
                                                ------------------------------
                                                   William W. McGuire, M.D.
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ David P. Koppe
                                                ---------------------------
                                                       David P. Koppe
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ William C. Ballard, Jr.
                                                -------------------------------
                                                       William C. Ballard, Jr.
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ Richard T. Burke
                                                ----------------------------
                                                       Richard T. Burke
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ James A. Johnson
                                                ------------------------------
                                                       James A. Johnson
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ Douglas W. Leatherdale
                                                -------------------------------
                                                       Douglas W. Leatherdale
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 3, 1997


                                                   /s/ Walter F. Mondale
                                                ----------------------------
                                                       Walter F. Mondale
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ Mary O. Mundinger
                                                -----------------------------
                                                       Mary O. Mundinger
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ Robert L. Ryan
                                                ----------------------------
                                                       Robert L. Ryan
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 4, 1997


                                                   /s/ Kennett L. Simmons
                                                ------------------------------
                                                       Kennett L. Simmons
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


                                                   /s/ William G. Spears
                                                ------------------------------
                                                       William G. Spears
<PAGE>
 
                                                                      Exhibit 24

                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below hereby constitutes and appoints David J. Lubben and William W.
McGuire, M.D., his true and lawful attorneys-in-fact and agents, with full
powers of substitution and resubstitution, for him and in his name, place and
stead, in any and all capacities to execute a Registration Statement on Form S-3
to be filed under the Securities Act of 1933, as amended, for the registration
of the resale by certain shareholders of United HealthCare as expressly named in
such Registration Statement of 263,032 shares of Common Stock of United
HealthCare Corporation, and any and all post-effective amendments thereto, and
to file the same, with all exhibits thereto, and other documents in connection
therewith, with the Securities and Exchange Commission, granting unto said
attorneys-in-fact and agents full power and authority to do and perform to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, or their substitutes, may
lawfully do or cause to be done by virtue hereof.

Dated: December 5, 1997


       
                                               /s/ Gail R. Wilensky
                                              ------------------------------
                                                   Gail R. Wilensky


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