Under the CJR, which began April 1, acute care hospitals in selected geographic areas assume quality and payment accountability for retrospectively calculated bundled payments for lower extremity joint replacement (LEJR) episodes. Episodes begin with admission to an acute care hospital for an LEJR procedure that is paid under the IPPS through MS-DRGs 469 or 470 (Major joint replacement or reattachment of lower extremity with or without MCC, respectively) and end 90 days after the date of discharge from the hospital.