Introduction
If you’ve ever searched for a hospital on Medicare’s Care Compare website, you’ve seen them — those little gold stars next to each hospital’s name. One star, three stars, five stars. They look simple enough. The hospital with more stars must be better, right?
It’s not quite that simple, and the way these ratings are calculated has changed significantly for 2026. Understanding what those stars actually represent — and what they don’t — can save you from making a hospital decision based on a number that doesn’t apply to your situation.
This guide breaks down how CMS hospital star ratings work, what changed in 2026, and how to use the rating without being misled by it.
What is the CMS hospital star rating?
CMS stands for the Centers for Medicare & Medicaid Services — the federal agency that runs Medicare and Medicaid. Every year, CMS gives most U.S. hospitals an overall quality rating from 1 to 5 stars, displayed on the Care Compare website. The system was launched to give patients a quick, recognizable way to compare hospitals — similar to how you’d compare restaurants or hotels.
Here’s the key thing to understand: the star rating is a summary score. CMS pulls together data from dozens of quality measures, weighs them across five categories, and condenses everything into a single number. That makes it useful for a quick scan but also means a lot of nuance gets compressed into one star.
To even qualify for a rating, a hospital has to report enough data — at least three measures across at least three of the measure groups, including one outcome group like mortality, safety, or readmissions. Smaller hospitals, critical access hospitals, and certain specialty hospitals may not have enough data to receive a rating at all. That’s not necessarily a bad sign; it just means the rating system doesn’t apply to them.
The five categories that make up the rating
CMS evaluates hospitals across five performance categories, sometimes called “measure groups.” Each one captures a different aspect of hospital quality:
1. Mortality
How often patients die during or shortly after a hospital stay. Specifically, this looks at 30-day death rates after admission for conditions like heart attack, heart failure, pneumonia, stroke, and certain surgeries. Lower is better.
2. Safety of care
This category covers things hospitals are supposed to prevent — hospital-acquired infections like C. diff, MRSA, CAUTI (catheter infections), CLABSI (bloodstream infections), and surgical site infections, plus complications from procedures. As of 2026, this category carries more weight than it used to (more on that below).
3. Readmissions
How often patients have to come back to the hospital within 30 days of being discharged. High readmission rates often signal that something went wrong — discharge happened too early, follow-up care wasn’t coordinated, or a complication wasn’t caught.
4. Patient experience
This comes from the HCAHPS survey — a standardized questionnaire that asks discharged patients about their hospital stay. Did the nurses communicate well? Did the staff respond quickly when you needed help? Was your pain managed? Was the room clean and quiet? These survey results feed directly into the star rating.
5. Timely and effective care
How well the hospital follows recommended care processes — things like giving heart attack patients aspirin quickly, screening for sepsis, and providing appropriate care in the emergency department.
CMS averages performance across these categories, weights them, and uses a clustering method to assign each hospital a star level relative to other hospitals nationally.
What changed for 2026: safety became a gatekeeper
This is the biggest shift in years, and most patients don’t know about it.
Historically, hospitals could offset weak safety performance with strong scores in other categories. A hospital with mediocre infection rates could still earn 5 stars if it excelled at patient experience and effective care. That’s no longer how it works.
Starting with the 2026 ratings, any hospital in the bottom quartile (lowest 25%) for safety of care is capped at a maximum of 4 stars — even if its overall numbers would otherwise warrant 5 stars. And starting with the 2027 ratings, hospitals in the bottom safety quartile will receive an automatic 1-star reduction, with a minimum rating of 1 star.
Why this matters for patients: a 4-star hospital in 2026 might be a hospital that’s actually performing at a 5-star level overall but has a safety problem the new rule is flagging. If you’re choosing between a 4-star and a 5-star hospital, it’s now worth digging into the safety data specifically — not just trusting the headline star.
CMS has also added new measures for 2026, including a hybrid hospital-wide mortality measure and additional patient experience items. The methodology is recalculated each year, which is why a hospital’s rating can shift even when nothing visible has changed about how it operates.
What does each star level actually mean?
Here’s a rough breakdown of what each rating represents in practice:
5 stars
Top tier. The hospital performs above the national average across most measure groups. Roughly 10–15% of hospitals nationally hold this rating in any given year. A 5-star rating doesn’t mean the hospital is perfect at everything — it means the overall summary score puts it in the top cluster.
4 stars
Above average. The hospital does well across most categories but may have weaker performance in one or two areas. As of 2026, a 4-star rating could also mean a hospital is being held back by the new safety cap. If a hospital is rated 4 stars, it’s worth checking specifically how it scores on safety to see whether the cap applies.
3 stars
Average. This is the most common rating — roughly a third of hospitals fall here. A 3-star hospital performs near the national average overall. These hospitals can still be excellent for specific procedures while average for others.
2 stars
Below average. The hospital underperforms relative to peers in multiple categories. Worth looking into the specific weaknesses before scheduling planned care.
1 star
Lowest tier. Bottom-cluster performance across categories. As of 2027, hospitals in the bottom safety quartile will automatically land here, regardless of other scores.
A note on context: about half of hospitals see their rating change from one year to the next, often by a single star. That’s normal. The methodology is competitive — hospitals are graded relative to one another, so improvement at one hospital can shift another’s rating without anything actually changing at the second hospital.
What CMS star ratings don’t tell you
This is where most patients get tripped up. The overall star rating is helpful as a starting point, but it has real limitations:
It’s an average across many measures. A 5-star hospital might be excellent at heart procedures and average at orthopedics. A 3-star hospital might be the best in the region for the specific surgery you need. The overall star tells you about the average patient — not about you.
It’s based on Medicare patient data. CMS calculates ratings primarily from Medicare claims and HCAHPS surveys. If you’re younger or have private insurance, the data still applies broadly, but it may not capture differences in how the hospital treats non-Medicare populations.
It lags behind real-time performance. The data feeding the 2026 rating reflects care delivered in earlier years. A hospital that has dramatically improved (or declined) in the last 12 months won’t see that show up immediately.
It doesn’t reflect cost or insurance coverage. A 5-star hospital that’s out-of-network for your insurance plan can still cost you tens of thousands of dollars more than a 3-star hospital that’s in-network.
It doesn’t tell you about specific doctors or units. Hospital ratings are facility-wide. A specific surgeon, unit, or specialty program may perform very differently from the hospital’s overall average.
For more on how to weigh ratings against other factors when picking a hospital, our complete patient guide to choosing a hospital walks through the full process.
How to actually use the star rating when choosing a hospital
Here’s a practical approach:
1. Use the overall star as a quick filter, not a final answer. If a hospital has 1 or 2 stars, that’s a flag worth investigating. If it has 4 or 5, that’s a positive signal — but not a green light to stop looking.
2. Drill into the categories that matter for your care. On Care Compare, you can click into a hospital’s detail page and see how it scores in each measure group. If you’re having surgery, look at safety of care and complications. If you’re managing a chronic condition, look at readmissions. If patient experience is important to you, look at the HCAHPS scores specifically.
3. Check the safety domain even on 4-star hospitals. With the new 2026 rule, a 4-star rating could be hiding a safety issue. It’s worth a click to confirm.
4. Combine the rating with patient reviews. CMS data tells you what happened on average across thousands of patients. Patient reviews tell you what it actually felt like to be there. Both matter. Browse verified patient and worker reviews on ScrubInformer’s facility pages alongside the CMS data for the fullest picture.
5. Cross-check with other rating systems. Leapfrog Hospital Safety Grade uses different data and methodology. The Joint Commission accreditation provides another independent check. When multiple systems agree, that’s a stronger signal than any single rating.
Where to look up a hospital’s CMS star rating
CMS publishes star ratings on its official Care Compare website. Here’s how to find them:
- Go to medicare.gov/care-compare
- Choose “Hospital” as the provider type
- Enter your ZIP code or the hospital’s name
- Click on the hospital to see its overall star rating and a breakdown by category
The data is updated annually, with refreshes posted in spring. Each hospital’s page also shows comparison data — how it stacks up against state and national averages on specific measures.
Frequently asked questions
Is a 5-star hospital always better than a 3-star hospital?
Not for every patient or every procedure. A 5-star hospital outperforms most peers on the overall summary score, but a 3-star hospital might be the regional leader for the specific surgery or condition you’re dealing with. Always check procedure-specific outcomes alongside the overall rating.
Why do CMS star ratings change every year?
CMS recalculates ratings annually using the most recent two to three years of data. The thresholds (called “cut points”) are also recalculated each year based on national performance. So a hospital can earn a different star rating without changing how it operates — its peers shifted around it.
What’s the difference between CMS star ratings and Leapfrog grades?
CMS rates hospitals 1 to 5 stars based on five categories of measures, drawn primarily from Medicare data. Leapfrog gives letter grades (A through F) focused specifically on patient safety, using both publicly available data and a voluntary hospital survey. The two systems sometimes agree, sometimes don’t. Looking at both gives you a more complete picture than either alone.
Why do some hospitals not have a star rating?
To qualify for an overall rating, a hospital has to report enough data — at least three measures across at least three measure groups, including one outcome group. Smaller hospitals, critical access hospitals, and some specialty hospitals (like certain cancer centers) often don’t report enough measures to qualify. The absence of a rating isn’t a bad sign on its own.
How are patient experience scores included in the rating?
Patient experience comes from the HCAHPS survey — a standardized questionnaire sent to a random sample of discharged patients. It covers communication with nurses and doctors, responsiveness, pain management, cleanliness, and overall satisfaction. To get HCAHPS star ratings, a hospital needs at least 100 completed surveys over a rolling four-quarter period.
Does the star rating include billing or cost?
No. CMS star ratings measure clinical quality and patient experience — not cost, billing practices, or insurance coverage. A hospital can have a high star rating and still surprise you with out-of-network bills if you don’t verify coverage in advance.
What changed about CMS star ratings in 2026?
The biggest change is that safety of care now functions as a gatekeeper. Hospitals in the bottom safety quartile are capped at 4 stars in 2026, and starting in 2027, they’ll be automatically reduced to 1 star. CMS also added new measures, including a hybrid hospital-wide mortality measure and additional patient experience items.
The bottom line
CMS hospital star ratings are a useful tool — but they’re a starting point, not a final answer. Five categories of data get compressed into a single star, and a lot of important information lives in the details that the headline number can’t capture.
The smart approach: use the star rating to narrow your options, then drill into the specific categories that matter for your situation. Cross-check with Leapfrog grades, real patient reviews, and your own visit if you can. And remember the new 2026 reality — a 4-star hospital might be carrying a safety flag that’s worth investigating before you commit.
For the full step-by-step process of evaluating and choosing a hospital, see our complete patient guide to choosing a hospital in 2026. And when you’re ready to compare specific facilities, browse verified patient and worker reviews on ScrubInformer to see what real experiences look like behind the numbers.