 Shares of Cardiovascular Systems Inc. , a medical device company focused on treatments for vascular and coronary disease, tumbled 10.2 in afternoon trading, and has dropped 18.1 amid a four-day losing streak. Needham analyst Mike Matson noted that the Centers for Medicare Medicaid Services CMS proposed physician fee schedule for 2022 includes cuts of about 22 to office-based lab OBL payments for peripheral atherectomy. 