FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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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1. Name and Address of Reporting Person * CALABRO JOSEPH M   2. Issuer Name and Ticker or Trading Symbol MEDNAX, INC. [MD] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President and COO (Last) (First) (Middle) 1301 CONCORD TERRACE 3. Date of Earliest Transaction (Month/Day/Year) 02/06/2014 (Street) SUNRISE, FL 33323 4. If Amendment, Date Original Filed(Month/Day/Year) 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 Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/06/2014   M   6,999 A $ 22.35 233,541 D   Common Stock 02/06/2014   S   6,999 (1) D $ 55.033 (2) 226,542 D   Common Stock 02/07/2014   M   55,282 A $ 22.35 281,824 D   Common Stock 02/07/2014   S   55,282 (1) D $ 55.1992 (3) 226,542 D   Common Stock 02/10/2014   M   219 A $ 22.35 226,761 D   Common Stock 02/10/2014   M   87,500 A $ 27.715 314,261 D   Common Stock 02/10/2014   S   87,719 (1) D $ 55.8151 (4) 226,542 (5) D   Common Stock               8 I By Spouse

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

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Stock Option (Right to Buy)

$ 22.35

02/06/2014

M

6,999

06/01/2009

06/01/2016

Common Stock

6,999

$ 22.35

55,501

D

Stock Option (Right to Buy)

$ 22.35

02/07/2014

M

55,282

06/01/2009

06/01/2016

Common Stock

55,282

$ 22.35

219

D

Stock Option (Right to Buy)

$ 22.35

02/10/2014

M

219

06/01/2009

06/01/2016

Common Stock

219

$ 22.35

0

D

Stock Option (Right to Buy)

$ 27.715

02/10/2014

M

87,500

06/02/2011

06/02/2018

Common Stock

87,500

$ 27.715

62,500

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
CALABRO JOSEPH M 1301 CONCORD TERRACE SUNRISE, FL 33323			President and COO

Signatures

Dominic J. Andreano, Attorney-in-fact		02/10/2014
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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)	Sales made pursuant to Reporting Person's 10b5-1 trading plan.
(2)	Sales of shares were executed in eleven (11) separate transactions with prices ranging from $55.00 to $55.10 for a weighted average sales price of $55.03.
(3)	Sales of shares were executed in thirty-nine (39) separate transactions with prices ranging from $55.00 to $55.38 for a weighted averages sales price of $55.1992.
(4)	Sales of shares were executed in one hundred seventeen (117) separate sales with prices ranging from $55.02 to $56.41 for a weighted average sales price of $55.8151.
(5)	All share amounts and exercise prices have been adjusted to reflect the Issuer's 2-for-1 stock split effective December 19, 2013.

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