UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

IntegraMed America, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

45810N302

(CUSIP Number)

September 24, 2012

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

¨ Rule 13d-1(b)

x Rule 13d-1(c)

¨ Rule 13d-1(d)

The information required in the remainder of this cover page shall not be deemed to be “filed” for purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 1 of 10 Pages

Item 1.

IntegraMed America, Inc. (the “Company”)

Two Manhattanville Road

Purchase, NY 10577

Diamondback Master Fund, Ltd.

c/o Ogier Fiduciary Services (Cayman) Ltd.

89 Nexus Way, Camana Bay

Grand Cayman KY1-9007

Citizenship: Cayman Islands, British West Indies

Diamondback Capital Management, LLC

One Landmark Square, 15th Floor

Stamford, CT 06901

Citizenship: State of Delaware

DBCM Partners, LLC

One Landmark Square, 15th Floor

Stamford, CT 06901

Citizenship: State of Delaware

Common Stock, $0.01 par value (“Common Stock”)

45810N302

If this statement is filed pursuant to Rule 13d-1(c), check this box.  x

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

This Amendment No. 1 (this “Amendment”) relates to the beneficial ownership of the Common Stock of the Company. This Amendment is being filed on behalf of the Reporting Persons and amends and supplements in their entirety the Schedule 13G filed by the Reporting Persons on January 9, 2012. Capitalized terms used herein and not otherwise defined in this Amendment have the respective meanings given such terms set forth in the Schedule 13G and the Company’s initial Schedule 13D.

As of the date of this filing, (i) Diamondback Master Fund, Ltd. no longer beneficially owns any shares of Common Stock and (ii) each of Diamondback Capital Management, LLC and DBCM Partners, LLC no longer may be deemed beneficial owner of any shares of Common Stock.

Diamondback Capital Management, LLC is the investment manager of Diamondback Master Fund, Ltd. DBCM Partners, LLC is the managing member of Diamondback Capital Management, LLC. Each of Lawrence Sapanski and Richard H. Schimel (the “Diamondback Principals”) serve as managing members of DBCM Partners, LLC. The foregoing should not be construed in and of itself as an admission by any Reporting Person or the Diamondback Principals as to beneficial ownership of the shares of Common Stock owned by another Reporting Person. In addition, each of Diamondback Capital Management, LLC, DBCM Partners, LLC and the Diamondback Principals disclaims beneficial ownership of the shares of Common Stock owned by Diamondback Master Fund, Ltd.

(b) Percent of class:

The Company’s Schedule 13D/A filed on September 24, 2012, indicates that pursuant to the Merger Agreement, at the effective time of the Merger, the Certificate of Incorporation of the Company was amended, and such amended Certificate of Incorporation became the Certificate of Incorporation of the Company as the surviving corporation of the Merger. By virtue of the Merger, all of the outstanding shares of the Company’s Common Stock issued and outstanding as of the effective time of the Merger were cancelled and converted into the right to receive $14.05 in cash without interest or were otherwise cancelled for no consideration. Accordingly, following the effective time of the Merger, none of Diamondback Master Fund, Ltd., Diamondback Capital Management, LLC and DBCM Partners, LLC could be deemed to beneficially own any outstanding shares of

Common Stock. The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of shares of Common Stock owned by another Reporting Person.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities check the following  x.

Not applicable.

Not applicable.

See Exhibit I.

Not applicable.

By signing below each of the undersigned certifies that, to the best of its knowledge and belief, the securities referred to above were not acquired and were not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and were not held in connection with or as a participant in any transaction having that purpose or effect.

Exhibits:

Exhibit I: Joint Filing Agreement, dated as of February 12, 2013, by and among Diamondback Master Fund, Ltd., Diamondback Capital Management, LLC and DBCM Partners, LLC

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information with respect to it set forth in this statement is true, complete, and correct.

Dated: February 12, 2013

Exhibit I

JOINT FILING AGREEMENT

This will confirm the agreement by and among the undersigned that the Schedule 13G filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the common stock, $0.01 par value, of IntegraMed America, Inc., is being filed, and all amendments thereto will be filed, on behalf of each of the persons and entities named below in accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. This Agreement may be executed in two or more counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument.

Dated as of February 12, 2013