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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(Print or Type Responses)

1. Name and Address of Reporting Person * FRIEDMAN JOHN H   2. Issuer Name and Ticker or Trading Symbol Cardiovascular Systems Inc [CSII] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 651 CAMPUS DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 09/04/2013 (Street) ST. PAUL, MN 55112 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               8,000 D   Common Stock               421,023 I Easton Capital Partners, LP (1)

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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)	$ 7.9							(2)	10/08/2017	Common Stock	4,321		4,321	D
Stock Option (right to buy)	$ 11.38							(2)	11/12/2017	Common Stock	15,088		15,088	D
Stock Option (right to buy)	$ 8.83							(2)	08/14/2016	Common Stock	38,820		38,820	D
Restricted Stock Units	(3)							(3)	(3)	Common Stock	5,714		5,714	D
Restricted Stock Units	(3)							(3)	(3)	Common Stock	11,628		11,628	D
Restricted Stock Units	(3)							(3)	(3)	Common Stock	21,739		21,739	D
Restricted Stock Units	(3)							(3)	(3)	Common Stock	7,192		7,192	D
Restricted Stock Units	(3)							(3)	(3)	Common Stock	10,917		10,917	D
Restricted Stock Units	(3)	09/04/2013		A		4,580		(3)	(3)	Common Stock	4,580	$ 0	4,580	D
Warrant (Right to Buy)	$ 9.28							09/12/2008	09/12/2013	Common Stock	107,833		107,833	I	Easton Hunt Capital Partners, L.P. (4)
Warrant (Right to Buy)	$ 8.83							02/25/2009	02/24/2014	Common Stock	151,617		151,617	I	Easton Hunt Capital Partners, L.P. (4)
Warrant (Right to Buy)	$ 8.83							02/25/2009	02/24/2014	Common Stock	151,617		151,617	I	Easton Capital Partners, LP (4)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
FRIEDMAN JOHN H 651 CAMPUS DRIVE ST. PAUL, MN 55112	X

Signatures

/s/ Jeffrey S. Points as Attorney-in-Fact for John H. Friedman pursuant to Power of Attorney previously filed.		09/06/2013
**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)	Mr. Friedman disclaims beneficial ownership of shares held by Easton Capital Partners, LP except to the extent of his pecuniary interest therein.
(2)	Fully exercisable.
(3)	Each restricted stock unit represents the right to receive a payment from CSI equal in value to the market price per share of CSI common stock on the date of payment and shall be payable in cash or shares of the Company's Common Stock beginning six months following the termination of each director's board membership.
(4)	Mr. Friedman disclaims beneficial ownership of warrants held by Easton Hunt Capital Partners, L.P. and Easton Capital Partners, LP except to the extent of his pecuniary interest therein.
Remarks: Remarks:  The options and restricted stock units are held for the benefit of Easton Hunt Capital Partners, L.P. and Easton Capital Partners, LP.

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