In a health policy sense, a complaint filed because of dissatisfaction with the quality of care by a provider or with customer service or some other action by a health plan. Medicare fee-for-service, Medicare health maintenance organizations and Medicare Part D prescription drug plans, as well as Medicaid and most other health plans, have formal procedures for handling and responding to grievances. If a Medicare beneficiary files a grievance against a hospital, a Quality Improvement Organization will review the case and guarantee the patient’s stay, possibly free-of-charge, until the review has been completed. Under the Affordable Care Act (ACA), all consumers will have the right to challenge┬ádecisions, including coverage denials and rescissions, made by their health plans. (Also see appeal.)