CMS Star Ratings Explained: How Nursing Homes Are Actually Scored

What the CMS five-star rating is

The five-star rating is published by the Centers for Medicare & Medicaid Services (CMS), the federal agency that certifies nursing homes to accept Medicare and Medicaid. Every certified nursing home in the country carries an overall rating from one to five stars, plus three separate component ratings underneath it.

It is not a review score. No resident, family member or marketing team contributes to it. It is built entirely from state inspection records, payroll-based staffing data submitted by the home itself, and clinical outcome measures drawn from resident assessments and Medicare claims.

The critical limit: the five-star system covers Medicare/Medicaid-certified nursing homes only. Assisted living communities, memory care units inside assisted living, independent living and adult family care homes are licensed by individual states and have no federal star rating at all. Anyone showing you a star rating for an assisted living community is showing you something other than CMS data.

• Overall rating — one to five stars, derived from the three components below
• Health inspections — the heaviest component, based on state survey results
• Staffing — nurse hours per resident per day, taken from payroll records
• Quality measures — 15 clinical outcomes covering long-stay and short-stay residents

How the health inspection rating works

State survey agencies inspect each certified nursing home roughly once a year, on an unannounced basis, and again whenever a complaint is investigated. Inspectors record every regulation the home fails to meet as a deficiency, each with its own tag number.

CMS scores the three most recent annual inspection cycles plus complaint investigations from the same period, weighting the most recent cycle most heavily. Every deficiency earns points based on how serious it is and how many residents it affected — more points is worse.

The resulting score is then ranked against other nursing homes in the same state, not nationally. The top 10 percent in a state receive five stars, the bottom 20 percent receive one star, and the remaining 70 percent are split evenly across two, three and four stars. This is why a three-star home in a strictly-inspected state can have a cleaner record than a four-star home elsewhere — the curve is drawn state by state.

Reading deficiency tags, scope and severity

Each deficiency is placed on a grid with twelve cells, labelled A through L. The letter tells you two things at once: severity (how much harm was involved) and scope (how many residents were affected).

Severity climbs from no actual harm with minimal potential for harm, to no actual harm with potential for more than minimal harm, to actual harm, to immediate jeopardy — the most serious finding, meaning a situation likely to cause serious injury or death. Scope runs isolated, pattern, then widespread.

A home can carry a long list of A-through-C findings and still be a reasonable option; those are largely paperwork and low-risk process issues. A single J, K or L finding is a different matter entirely and deserves a direct question to the administrator about what changed afterwards.

• A, B, C — no actual harm, minimal potential for harm (isolated → widespread)
• D, E, F — no actual harm, potential for more than minimal harm
• G, H, I — actual harm that is not immediate jeopardy
• J, K, L — immediate jeopardy to resident health or safety

How the staffing rating works

Staffing is scored on two numbers: total nurse staffing hours per resident per day, and registered nurse hours per resident per day. Both come from Payroll-Based Journal data, which homes submit quarterly and which is auditable against actual payroll records rather than self-reported estimates.

The hours are case-mix adjusted, meaning CMS compares each home against the staffing level its particular resident population would be expected to need — a home caring for higher-acuity residents is held to a higher hours target.

Staffing is the component most closely tied to day-to-day experience, and it is worth weighting heavily. A home can be automatically dropped to one star for staffing if it reports several days in a quarter with no registered nurse on site at all.

How quality measures are scored

The quality measure rating combines 15 clinical indicators. Long-stay measures include pressure ulcers, falls with major injury, physical restraint use, urinary tract infections, antipsychotic medication use and worsening mobility. Short-stay measures cover rehospitalisation, emergency department visits and improvement in function after a rehab stay.

Most of this data comes from the Minimum Data Set assessments that nursing home staff complete for each resident, with several measures drawn from Medicare claims instead. Because the assessment portion is completed by the home itself, quality measures are the softest of the three components — treat a five-star quality measure score alongside a one-star inspection score with scepticism, not relief.

How the three components become one overall star

CMS starts with the health inspection rating and adjusts it. A four or five-star staffing rating adds one star; a one-star staffing rating subtracts one. A five-star quality measure rating adds one star; a one-star quality measure rating subtracts one. Quality measures can never lift a home above five stars, and the health inspection rating carries the most weight throughout.

This is why the overall number hides so much. A home with one-star inspections and five-star staffing and five-star quality measures still lands at three stars overall — the same overall figure as a home with three-star inspections and unremarkable everything else. The components tell you which of those two homes you are looking at; the single number does not.

Fines, penalties and Special Focus Facilities

When a deficiency is serious enough, CMS can impose a civil money penalty, either a one-off amount per instance or a daily amount that accrues until the problem is corrected. It can also suspend payment for new Medicare and Medicaid admissions, or in the most severe cases terminate the home from the programmes entirely.

Separately, CMS maintains the Special Focus Facility programme for homes with a persistent record of serious problems. Homes in the programme are inspected twice as often and must show sustained improvement or face termination. A Special Focus designation, or a candidate listing for one, is a stronger warning than any star count.

Fire safety is inspected under a separate Life Safety Code survey covering sprinklers, alarms, exits, smoke barriers and evacuation planning. Those findings sit outside the five-star calculation entirely, which means a home can hold four stars and still carry open fire safety citations.

What the star rating does not tell you

Ratings lag reality. Inspection cycles run about a year apart and data is refreshed quarterly, so a change of ownership, a new director of nursing or a collapse in staffing can take many months to show up in the stars.

The state-relative curve means stars are not directly comparable across state lines. Nothing in the rating covers food, activities, atmosphere, the condition of the building, whether the staff who look after your parent stay for years or turn over every quarter, or what the home actually charges.

Use the rating as a filter that eliminates the clearly unsafe and flags what to ask about — not as a ranking that picks a home for you. The inspection narrative, the staffing trend and an unannounced visit at a mealtime tell you more than the number ever will.

How Clear Care Connect uses this data

We publish the CMS data as it is released, per facility, labelled with which number came from which source. Where a facility has a federal star rating we show it and its three components; where a facility is state-licensed rather than federally certified — most assisted living — we say so rather than substituting a review average and calling it a rating.

Inspection history, deficiency detail, penalty totals and fire safety findings sit in the premium facility report at $9.99, because presenting them properly means reconciling several federal datasets per facility. Facility names, locations, contact details, care types and the headline ratings stay free and open.

We are not a referral broker. No facility pays us to rank higher, and no ordering on this site is influenced by whether a community buys placements. That matters here specifically, because a rating explanation is only useful from someone who has no commercial reason to steer you past the low-rated home paying for leads.

CMS ratings FAQ