Hospital Mortality Rates by State: Understanding Patient Outcome Data

Hospital mortality rates — the percentage of patients who die during or shortly after hospitalization — vary significantly across states and individual hospitals. These rates, tracked by CMS, serve as one of the most important measures of hospital quality and are a key component of the overall star rating system.

How Hospital Mortality Is Measured

CMS tracks 30-day mortality rates, meaning the percentage of patients who die within 30 days of hospital admission, for several serious conditions:

• Acute myocardial infarction (AMI): Heart attack patients
• Heart failure (HF): Patients admitted for heart failure
• Pneumonia: Patients hospitalized with pneumonia
• Chronic obstructive pulmonary disease (COPD): Patients with acute COPD exacerbations
• Stroke: Patients hospitalized for acute ischemic stroke
• Coronary artery bypass graft (CABG): Patients undergoing bypass surgery

State-Level Variation in Mortality Rates

Mortality rates vary by state for several reasons:

• Population health: States with higher rates of chronic disease may see different mortality patterns
• Healthcare infrastructure: States with more academic medical centers and specialists may have better outcomes for complex conditions
• Access to care: Rural states may face delays in emergency care due to longer transport times
• Hospital resources: Staffing levels, technology, and specialty services affect outcomes
• Socioeconomic factors: Poverty, insurance status, and health literacy influence patient outcomes

Risk Adjustment: Ensuring Fair Comparisons

CMS uses sophisticated risk adjustment to ensure fair comparisons between hospitals. This statistical process accounts for differences in patient age, pre-existing conditions, and severity of illness, so hospitals that treat sicker patients are not unfairly penalized.

Using Mortality Data in Hospital Selection

When reviewing hospital mortality data:

• Access condition-specific mortality rates on Medicare Care Compare
• Look for hospitals rated "better than national average" for the condition you need treatment for
• Consider mortality data alongside other quality measures for a complete picture
• Discuss hospital outcomes with your physician, who can provide context for the data
• Remember that mortality rates reflect population-level statistics, not individual predictions

Data sourced from CMS. Mortality data is updated periodically. Visit Medicare Care Compare or call 1-800-MEDICARE for current data.

Disclaimer: This article is informational and should not be used to predict individual patient outcomes. Consult your healthcare provider for personalized medical guidance.