Under Medicare Part A guidelines for inpatient rehabilitation hospital stays, Medicare covers 100 percent of approved charges for the first 60 days of a benefit period, subject to the initial inpatient deductible. Beginning on day 61 and lasting through day 90, daily co-insurance amounts apply. For patients requiring extended care beyond 90 days, lifetime reserve days may be utilized, whereas stays exceeding these thresholds exhaust standard Medicare inpatient psychiatric and rehabilitation benefit limits.