1. Some Medicare Advantage Organization denials of prior authorization requests raise concerns about beneficiary access to medically necessary care Publication: Washington, DC : U.S. Department of Health and Human Services, Office of Inspector General, April 2022 Subject(s): Government RegulationInsurance, Health, Reimbursement -- economicsMedicare Part C -- economicsMedicare Part C -- organization & administrationPrior Authorization -- economicsTime-to-TreatmentUnited StatesUnited States. Department of Health and Human Services