Centers for Medicare & Medicaid Services Hospital Compare

Centers for Medicare & Medicaid Services Hospital Compare
Name	Centers for Medicare & Medicaid Services Hospital Compare
Agency	Centers for Medicare & Medicaid Services
Formed	2005
Jurisdiction	United States
Website	Hospital Compare

Centers for Medicare & Medicaid Services Hospital Compare is a public reporting tool operated by the Centers for Medicare & Medicaid Services that presents comparative information about hospitals’ performance on standardized measures. It aims to inform beneficiaries, clinicians, researchers, and purchasers about Medicare (United States), Medicaid (United States), Affordable Care Act, Department of Health and Human Services (United States), and Agency for Healthcare Research and Quality–related quality metrics to promote transparency and accountability. The service aggregates clinical process measures, outcome measures, patient experience indicators, and structural attributes for acute care hospitals and specialty facilities.

Overview

Hospital Compare provides searchable profiles for individual hospitals across the United States, linking facility names to performance on measures derived from Inpatient Quality Reporting Program, Outpatient Quality Reporting (OQR) Program, and related CMS initiatives. The platform presents measures that align with initiatives such as Hospital Readmissions Reduction Program, Hospital Value-Based Purchasing Program, and Meaningful Use incentives under the Health Information Technology for Economic and Clinical Health Act. Users can compare hospitals by geographic identifiers like Medicare administrative contractor regions, State of California, New York (state), or metropolitan areas and by facility type including Critical access hospital and Children's Hospital Association facilities.

History and Development

The initiative emerged following policy discussions after enactments such as the Balanced Budget Act of 1997 and subsequent reporting expansions under the Medicare Prescription Drug, Improvement, and Modernization Act of 2003. Hospital Compare launched publicly in 2005 and evolved through phases tied to the American Recovery and Reinvestment Act of 2009 and provisions of the Patient Protection and Affordable Care Act. Over time, CMS integrated data from federal programs and partnered with organizations like the National Quality Forum, The Joint Commission, and Centers for Disease Control and Prevention to refine measure specifications and public reporting cadence.

Data Sources and Methodology

CMS compiles Hospital Compare measures from claims data submitted to Centers for Medicare & Medicaid Services, clinical data from the American Hospital Association surveys, and patient-reported data from the Hospital Consumer Assessment of Healthcare Providers and Systems questionnaire administered under contracts with vendors and research groups affiliated with RAND Corporation and Johns Hopkins University. Methodology uses risk adjustment frameworks influenced by standards set by the National Quality Forum and statistical approaches developed in collaboration with academic centers such as Harvard Medical School and University of Pennsylvania. Measure definitions reflect coding systems like the International Classification of Diseases, Ninth Revision (ICD-9) and International Classification of Diseases, Tenth Revision (ICD-10), and outcome calculations consider enrollee populations from Medicare Part A, Medicare Part B, and dual-eligibles.

Reported Measures and Metrics

Reported measures include process indicators for conditions such as acute myocardial infarction, heart failure, and pneumonia (disease), outcome measures including 30-day risk-standardized mortality and readmission rates, measures of healthcare-associated infections consistent with Centers for Disease Control and Prevention surveillance definitions (e.g., Clostridioides difficile and Methicillin-resistant Staphylococcus aureus), and patient experience metrics from HCAHPS addressing communication, pain management, and discharge information. Structural measures capture electronic health record adoption consistent with Meaningful Use and participation in quality programs like Accountable Care Organization models or Bundled Payments for Care Improvement demonstrations.

Quality Ratings and Star System

CMS introduced composite scoring and a five-star rating system to summarize hospital performance, paralleling approaches used by rating organizations such as Leapfrog Group and private evaluators like U.S. News & World Report. Star ratings combine multiple domains—mortality, safety of care, readmission, patient experience, effectiveness of care, timeliness of care, and efficient use of imaging—using statistical aggregation methods endorsed by groups like the National Quality Forum. Ratings are accompanied by caveats about measure coverage, case-mix adjustment, and sampling variability; these design choices reflect debates in health services research communities, including scholars from Yale School of Medicine and Stanford University School of Medicine.

Impact and Use by Stakeholders

Hospital Compare influences decision-making by Medicare beneficiaries, referral patterns among clinicians at institutions like Mayo Clinic, Cleveland Clinic, and Massachusetts General Hospital, and contracting decisions by purchasers such as Aetna and UnitedHealthcare. Researchers at academic centers including University of Michigan and Columbia University have used Hospital Compare data to study quality improvement, disparities, and policy impacts. Policymakers cite Hospital Compare metrics in evaluations of programs under the Centers for Medicare & Medicaid Services Innovation Center and in state-level policy discussions involving departments like the New York State Department of Health and the California Department of Health Care Services.

Criticisms and Limitations

Critiques address measure selection, risk adjustment, and unintended consequences. Observers from American Medical Association and Association of American Medical Colleges have raised concerns about attribution of outcomes, while analysts at Brookings Institution and Kaiser Family Foundation have examined equity implications and access effects. Methodological limitations include reliance on Medicare fee-for-service claims excluding substantial populations covered by Medicare Advantage and Commercial insurance, potential coding shifts documented in studies by National Bureau of Economic Research, and challenges in measuring complex care at specialty centers such as Johns Hopkins Hospital or Stanford Health Care. Debate continues about public reporting’s effects on quality improvement versus risk avoidance, with empirical assessments published in journals affiliated with American Journal of Public Health and The New England Journal of Medicine.

Category:Medicare (United States)