Patient ReadmissionMedicarePatient DischargeLength of StayCenters for Medicare and Medicaid Services (U.S.)United StatesHospital CostsRetrospective StudiesMedicare Part BDiagnosis-Related GroupsLanguage ArtsQuality of Health CareHeart FailureMedicare Part AHospitalizationQuality Indicators, Health CareFee-for-Service PlansOutcome and Process Assessment (Health Care)Continuity of Patient CareInsurance Claim ReviewOutcome Assessment (Health Care)Risk Factors