CMS Five-Star Quality Rating System: How It Works
The CMS Five-Star Quality Rating System scores every Medicare- and Medicaid-certified nursing home from 1 to 5 stars across three domains — Health Inspections, Staffing, and Quality Measures — then combines them into an Overall Rating using a fixed CMS formula, not a simple average. Health Inspections is the foundation and the only domain based directly on survey findings, which means every deficiency your facility is cited for has a direct, lasting line to your public star rating.
Here's how each domain is scored, how the overall number gets built, and where survey outcomes do the most damage.
The Three Domains
1. Health Inspections
Built from points assigned for deficiencies found during the last three years of standard surveys, complaint surveys, and any revisits — with the most recent survey weighted more heavily than older ones. More points mean worse performance. Facilities are ranked against each other within their state, with the top 10% receiving 5 stars and the bottom 20% receiving 1 star. Unlike the other two domains, these cut points are not fixed — CMS recalibrates them every month specifically to keep that top-10%/bottom-20% distribution roughly constant over time, which means your rating moves relative to how other facilities in your state are doing, not against a static bar.
2. Staffing
Based on nursing hours per resident day, reported through the Payroll-Based Journal (PBJ) system and adjusted for resident acuity. The staffing rating combines six measures: RN hours per resident day, total nurse hours per resident day, weekend staffing hours per resident day, RN turnover, total nurse turnover, and administrator turnover. To earn 5 stars here, a facility generally has to meet or exceed CMS staffing study thresholds for both RN and total nursing hours — falling short on either caps the rating. Unlike Health Inspections, the point thresholds for this domain are fixed nationally and don't shift monthly.
3. Quality Measures (QM)
Calculated from MDS clinical data and Medicare claims across 15 measures — 6 covering short-stay residents and 9 covering long-stay residents — things like pressure ulcers, falls with injury, use of antipsychotic medications, hospital readmissions, and successful return to the community. Ratings use the three most recent quarters of available data and, like Staffing, are scored against fixed national thresholds rather than a state-relative curve.
How the Overall Rating Is Built
The Overall Rating isn't an average of the three domains — it's a specific formula that starts with Health Inspections as the base and applies two additional caps:
Start with the Health Inspection rating
This is the baseline for the Overall Rating — everything else only adjusts it up or down from here.
Adjust for Staffing
Add one star if the Staffing rating is 4 or 5 stars and also higher than the Health Inspection rating. Subtract one star if the Staffing rating is 1 star.
Adjust for Quality Measures
Add one star to the running total if the Quality Measure rating is 5 stars. Subtract one star if the Quality Measure rating is 1 star.
Apply the Health Inspection ceiling
If the Health Inspection rating is 1 star, the Overall Rating cannot be upgraded by more than one star total, no matter how strong Staffing and Quality Measures are.
Apply the Special Focus Facility cap
If the nursing home is an active Special Focus Facility that hasn't graduated, the Overall Rating is capped at 3 stars, regardless of what the rest of the formula produces.
The Overall Rating can never exceed 5 stars or fall below 1, regardless of how the math works out. This structure means Health Inspections effectively sets the ceiling on your Overall Rating in most cases — strong staffing and quality measure scores can nudge the number up or down by a star, but they can't fully offset a poor survey history.
The abuse icon is a good example of the formula in action: a facility with a recent abuse/neglect/exploitation citation gets its Health Inspection rating capped at 2 stars, which — running through Step 2 through Step 4 above — mathematically limits the best possible Overall Rating to 4 stars no matter how strong Staffing and Quality Measures are.
Why Survey Deficiencies Have Outsized Weight
Because Health Inspections draws on three years of survey history with recent surveys weighted more heavily, a single bad survey doesn't just cost points once — it depresses the rating for up to three years, through every monthly recalculation, until it ages out or is offset by a stronger subsequent survey. Immediate Jeopardy findings hit hardest, since they sit at the top of the severity scale that generates Health Inspection points.
This is also why the speed and quality of Plan of Correction work matters beyond avoiding a CMP: a well-documented POC that resolves a citation quickly and holds up on revisit is the fastest lever a facility has to limit how long a deficiency drags down its public rating. See our full guide to writing a Plan of Correction and the full post-survey timeline for how that process actually runs.
What Doesn't Move the Needle as Fast
Staffing and Quality Measure data refresh more frequently — staffing quarterly, quality measures using rolling recent quarters — so improvements there show up in the public rating faster than Health Inspection gains, which depend on the next survey cycle. That asymmetry is worth knowing: a facility that improves staffing levels this quarter can see that reflected sooner than a facility working to recover from a poor survey outcome, which has to wait for the multi-year Health Inspection window to shift.
PoC360 Helps You Protect the Domain That Matters Most
Since Health Inspections is the ceiling on your entire Overall Rating, closing out citations fast and correctly is the highest-leverage thing you can do for your public score. PoC360 generates a structured first-draft POC the moment your survey is imported, so your team spends its 10 days reviewing and approving instead of starting from a blank page.
Start Free Trial →Frequently Asked Questions
How often is the CMS Five-Star Rating updated?+
Health Inspection ratings are recalculated monthly to reflect new survey results, using state-relative cut points CMS recalibrates each month. Staffing ratings update quarterly with new PBJ data. Quality Measures update using the three most recent available quarters.
Which domain matters most for the Overall Rating?+
Health Inspections, since it's the starting point for the Overall Rating formula and Staffing/Quality Measures can only add or subtract a star from that base — they can't override a poor Health Inspection score entirely.
Can a nursing home have a 5-star Overall Rating with a low Health Inspection score?+
No. Because the Overall Rating starts from the Health Inspection rating and can only be adjusted by one star in either direction from Staffing and one star from Quality Measures — and a 1-star Health Inspection rating further caps the total upgrade at one star — a low Health Inspection score makes a 5-star Overall Rating mathematically very difficult.
Does an Immediate Jeopardy citation affect the star rating?+
Yes, significantly. IJ findings sit at the top of the severity scale used to calculate Health Inspection points and can depress that domain — and therefore the Overall Rating — for as long as the finding remains within the lookback window CMS uses for that domain.
Does Special Focus Facility status cap the Overall Rating?+
Yes. An active SFF that hasn't graduated is capped at 3 stars Overall regardless of how the underlying formula calculates, separate from and in addition to the abuse-icon and Health Inspection caps.
Sources: CMS Five-Star Quality Rating System Technical Users' Guide, CMS Design for Care Compare Nursing Home Five-Star Quality Rating System. Last reviewed 2026-07-27.