UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (date of earliest event reported): March 9, 2012

MEDNAX, INC.

(Exact Name of Registrant as Specified in Its Charter)

(Address of principal executive office) (zip code)

Registrant’s telephone number, including area code (954) 384-0175

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 5.02    Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On March 9, 2012, Dany Garcia, a director of MEDNAX, Inc. a Florida corporation (the “Company”), advised the Company that she does not intend to stand for re-election to the board of directors of the Company (the “Board”) at the Company’s 2012 annual meeting of shareholders, currently scheduled to be held on May 10, 2012. Ms. Garcia indicated that her decision was due to time constraints.

At a meeting of the Board held on March 15, 2012, the remaining 10 incumbent directors of the Company were nominated to stand for re-election at the Company’s 2012 annual meeting of shareholders.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.