CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-135954, 333-158755, 333-158987, 333-160609, 333-160610, 333-168682, 333-168684, 333-175702, 333-175703, 333-182668, 333-182669, 333-189856, 333-189858, 333-197348, and 333-197350) and Form S-3 (No. 333-174681, 333-177327, 333-191768, and 333-192463) of Cardiovascular Systems, Inc. of our report dated August 28, 2014 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 10‑K.

/s/ PricewaterhouseCoopers LLP

Minneapolis, MN

August 28, 2014