FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Stanley Michael D 2. Date of Event Requiring Statement (Month/Day/Year) 02/13/2012 3. Issuer Name and Ticker or Trading Symbol MEDNAX, INC. [MD] (Last) (First) (Middle) 1301 CONCORD TERRACE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President, Pediatrix Division 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) SUNRISE, FL 33323 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 20,725 (1) D Â

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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options (Right to Buy)	06/01/2010	06/01/2017	Common Stock	11,625 (2)	$ 57.09	D	Â
Stock Options (Right to Buy)	06/02/2011	06/02/2018	Common Stock	13,853 (3)	$ 55.43	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Stanley Michael D 1301 CONCORD TERRACE SUNRISE, FL 33323	Â	Â	  President, Pediatrix Division	Â

Signatures

/s/ Thomas W. Hawkins, Attorney-in-fact		02/16/2012
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Includes 5,000 shares of common stock owned directly by the reporting person and held in an IRA, 3,700 shares of restricted stock granted on June 1, 2009 pursuant to the Issuer's 2008 Incentive Compensation Plan ("2008 ICP") that will vest on June 1, 2012, 5,640 shares of restricted stock granted on June 1, 2010 pursuant to the 2008 ICP that will vest in equal installments on June 1, 2012 and June 1, 2013 and 6,385 shares of restricted stock granted on June 1, 2011 pursuant to the 2008 ICP that will vest in three equal installments on June 1, 2012, June 1, 2013 and June 1, 2014.
(2)	Stock Options granted on June 1, 2007 pursuant to Issuer's 2004 Incentive Compensation Plan.
(3)	Stock Options granted on June 2, 2008 pursuant to Issuer's 2008 Incentive Compensation Plan.

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