Generally Medicare Part B is for medical insurance. However, Part B hospital insurance coverage applies under the following circumstances: (1) when a beneficiary receives inpatient hospital services and these cannot be reimbursed under Part A because the benefits are exhausted either before or after admission and before the stay reaches outlier status; (2) the outlier days are not covered or the waiver of liability payment is not made; (3) a noncovered level of care is received; or (4) the patient is not entitled to Part A or elects not to use lifetime reserve days. See Medicare Part B.