The Comprehensive Care for Joint Replacement (CJR) program, effective April 1, 2016, is a mandatory bundled payment model for hip and knee joint replacements, designed to reduce costs while improving care outcomes through a 90-day payment period post-discharge. Hospitals in 67 selected metropolitan statistical areas (MSAs) must participate, and they will receive target prices based on historical data to guide their financial planning. Providers must proactively assess their risks and performance in relation to CJR, as well as explore collaborative financial arrangements with other care providers to succeed in this new payment model.