Ownership Submission
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 *
Blackey Brent G
   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)
1225 OLD HIGHWAY 8 NW		 3. Date of Earliest Transaction (Month/Day/Year)
08/31/2016
(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 08/31/2016   M   2,045 A (1) 64,439 D  

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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 38,820   38,820 D  
Stock Option (right to buy) $ 7.9               (2) 10/08/2017 Common Stock 6,470   6,470 D  
Restricted Stock Units (3)               (3)   (3) Common Stock 71,324 (4)   71,324 (4) D  
Restricted Stock Units (5) 08/31/2016   M     2,045 08/31/2016 08/31/2016 Common Stock 2,045 $ 0 0 D  
Restricted Stock Units (5)             08/15/2019 08/15/2019 Common Stock 2,541   2,541 D  
Restricted Stock Units (6)               (6)   (6) Common Stock 5,949   5,949 D  
Restricted Stock Units (5)             09/01/2018 09/01/2018 Common Stock 2,855   2,855 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Blackey Brent G
1225 OLD HIGHWAY 8 NW
ST. PAUL, MN 55112		   X      

Signatures

 /s/ Amanda Schmall as Attorney-in-Fact for Brent G. Blackey pursuant to Power of Attorney previously filed.   09/02/2016
**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) Restricted stock units were paid in shares of common stock on a one-for-one basis.
(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 Company common stock beginning six months following the termination of each director's board membership.
(4) Represents the aggregate number of restricted stock units (all previously reported) held by reporting person that are payable in cash or shares of Company common stock beginning six months following the termination of each director's board membership.
(5) 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 Company common stock beginning on the payment date.
(6) 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 Company common stock beginning six months following the termination of each director's board membership; provided, however, that the restricted stock units vest in quarterly amounts of 1,488 shares on September 30, 2016 and 1,487 shares on each of December 31, 2016, March 31, 2017 and June 30, 2017.

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