The CMS five star rating is the number most families see first and understand least. It looks like a simple score out of five, but it is a composite of three separate measures, and it is graded on a curve within each state. Across the 14,534 rated nursing homes in the country, understanding how the score is built changes how you read it.
- The Three Ratings Behind the CMS Five Star Rating
- The Curve: Why a CMS Five Star Rating Is Not Portable
- How Recent Is the Rating?
- What the Rating Leaves Out
- How to Use the Rating Sensibly
- Why Two Components Can Disagree
- What a Change in Rating Means
- Frequently Asked Questions
- Official Sources
- Related Guides
The Three Ratings Behind the CMS Five Star Rating
The overall score combines a health inspection rating, a staffing rating and a quality measure rating. They are not equally trustworthy, and they are not gathered the same way.
Health inspections are conducted by state surveyors on behalf of CMS. They are the backbone of the overall score, and the only component gathered entirely by outsiders.
Staffing is calculated from payroll data facilities submit, measuring nursing hours per resident per day and adjusting for how sick the residents are. Staff turnover now feeds into this component too.
Quality measures come from clinical data facilities report about their own residents. This is the self-reported component, and when it disagrees with the inspection rating, the inspection rating is the more independent signal.
The Curve: Why a CMS Five Star Rating Is Not Portable
This is the part that surprises people. The health inspection rating is assigned by ranking facilities against others in the same state, not against a national standard. Roughly the top tenth of facilities in each state receive five stars on that component and roughly the bottom fifth receive one, with the remainder distributed in between.
The practical consequence is that a five-star facility in one state and a five-star facility in another have both been ranked highly among their own neighbours, not measured against the same absolute bar. Comparing a CMS five star rating across state lines does not mean what it appears to mean.
What does compare across state lines is the raw detail: deficiency counts, severity codes, fines, staffing hours and turnover percentages. Those are absolute numbers.
How Recent Is the Rating?
The health inspection component draws on the three most recent standard surveys plus complaint investigations, weighted so that the most recent cycle counts for most. That gives it useful memory, but it also means an old problem can still be weighing on a facility that has since improved, and a recent decline may not yet show.
The bigger issue is inspection recency. Nationally, 1,023 facilities — 7% of all certified nursing homes — have not had a standard health inspection in more than two years. For those facilities, the CMS five star rating describes a building as it was some time ago.
What the Rating Leaves Out
Some things sit outside the star score entirely. Fines and payment denials are recorded separately: 6,560 facilities nationally carry fines totalling $462.8 million. Abuse citations are flagged with their own icon rather than folded into the stars, currently on 1,433 facilities.
Ownership is not scored at all, and neither is whether a facility recently changed hands — which can reset how a building runs without resetting its rating.
How to Use the Rating Sensibly
Treat it as a filter rather than an answer. Use it to narrow a list of nearby facilities, then open the inspection reports for the ones you are seriously considering and read the actual findings.
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Weight the health inspection component above the quality measures. Check the date of the last standard inspection. Look at turnover as well as staffing hours. Then visit, more than once, at different times of day.
Why Two Components Can Disagree
It is common to find a facility with a strong quality measure score and a weak inspection score, and the combination is worth pausing on. The quality measures are built from data the facility reports about its own residents; the inspection rating comes from surveyors who arrived unannounced.
When those two disagree, the CMS five star rating averages the disagreement into a single number that conceals it. Opening the components separately, which Care Compare lets you do, is more informative than the headline score.
The staffing component sits between the two in reliability. It comes from payroll records rather than estimates, which makes it harder to present favourably than self-reported clinical measures.
What a Change in Rating Means
Ratings move, and the reason matters more than the direction. A drop caused by one new inspection with serious findings is a different event from a drop caused by an old good inspection ageing out of the calculation.
Because the CMS five star rating is comparative, a facility can also lose a star without anything changing inside it, simply because other facilities in the state improved. That is a genuine limitation of a curved score and a reason to look at the raw findings rather than tracking the star count over time.
Ownership changes are the case most worth watching. A sale does not reset the rating, so a building under new management may carry a score earned by its predecessor for a year or more.
Frequently Asked Questions
Is a 3-star nursing home acceptable?
Three stars means average for that state. Whether that is acceptable depends entirely on what the underlying inspection report says: a facility can sit at three stars with many minor citations or with one serious one, and those are very different situations.
Why do ratings differ between two nearby facilities?
Usually inspection history. Two facilities of similar size and price can diverge sharply if one has a pattern of repeated deficiencies and the other corrects problems and sustains the fix.
How often does the CMS five star rating update?
CMS refreshes the underlying data periodically, and a facility’s rating can change when a new inspection is completed or new staffing data is submitted. Always check the current listing rather than a saved figure.
Can facilities influence their own rating?
The quality measure component is built from data facilities report themselves, which is why it should carry less weight in your judgement than the inspection component gathered by outside surveyors.
Official Sources
- Medicare Care Compare — ratings, full inspection reports and penalty history for every certified facility
- CMS Provider Data Catalog — the underlying federal dataset behind the figures on this page
- National Consumer Voice — state Long-Term Care Ombudsman directory
Related Guides
- Nursing Home Ratings by State — All 50 States
- Nursing Home Ratings in Every State
- How to Read a Nursing Home Inspection Report
- Special Focus Facility: What the Designation Means
- How to File a Nursing Home Complaint
- Nursing Home Staffing and Turnover Explained
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About this information. Figures on this page are reproduced from the federal CMS Provider Data Catalog dataset processed 2026-07-01, without adjustment. CMS ratings are comparative measures updated periodically. Nothing here establishes that any facility caused harm to any resident, and nothing here is legal or medical advice. Confirm any facility’s current standing with CMS, and contact your state Long-Term Care Ombudsman or survey agency with concerns about a resident.