<PAGE>
EXHIBIT 23.3
Consent of Ernst & Young LLP, Independent Auditors
We consent to the incorporation by reference in the Registration Statement on
Form S-8 pertaining to the Insmed Incorporated Employee Stock Purchase Plan of
Insmed Incorporated of our report dated May 28, 1999, with respect to the
consolidated financial statements of Celtrix Pharmaceuticals, Inc. included in
the Registration Statement on Form S-4 (No. 333-30098) and Prospectus of Insmed
Incorporated, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Palo Alto, California
June 7, 2000