List of Acronyms/Abbreviations Health Care Efficiency Measures: Identification, Categorization, and Evaluation Acronym/AbbreviationDescription/NameACGAdjusted Clinical GroupsAHAAmerican Hospital AssociationAHRQAgency for Healthcare Research and QualityAQAAmbulatory Quality AllianceAPRAll Patient RefinedCMSCenters for Medicare and Medicaid ServicesCOLSCorrected ordinary least squaresDEAData envelopment analysisDRGDiagnosis-related groupsEPCEvidence-based Practice CenterEREmergency roomETGEpisode Treatment GroupsFTEFull-time equivalentHITHealth information technologyI/OInput/outputIHAIntegrated Healthcare AssociationIHCISIntegrated Healthcare Information Services, Inc.IOMInstitute of MedicineJCAHOJoint Commission on Accreditation of Healthcare OrganizationsLPNLicensed practical nurseMEGMedstat Episode GroupsNCQANational Committee for Quality AssuranceO/EObserved/expected ratioPPMSProvider Performance Measurement SystemRNRegistered nurseSFAStochastic frontier analysisTEPTechnical expert panelVAVeterans Administration Health System Current as of April 2008 Internet Citation: List of Acronyms/Abbreviations: Health Care Efficiency Measures: Identification, Categorization, and Evaluation. April 2008. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/efficiency/hcemabbr.html