How to read a nursing home's CMS star rating (and what it hides)
The federal five-star rating is the best public information you have about a nursing home, and it is easy to misread. What each star is built from, and the three things it will not tell you.
3 minute read
Every nursing home in the United States that accepts Medicare or Medicaid is inspected by the federal government, and the results are published. Nothing comparable exists for assisted living, which is licensed state by state — so if you are choosing a nursing home, you have a real instrument, and it is worth knowing how to hold it.
What the overall star is made of
The CMS Five-Star Quality Rating System scores each certified home from 1 to 5 — much below average to much above average — and the overall star is built from three underlying ratings.
Health inspections. Unannounced on-site surveys, roughly annually, plus any investigations triggered by a complaint. Inspectors record deficiencies, each with a scope (how many residents were affected) and a severity (how badly). This is the most heavily weighted component and the one built on someone actually walking the building.
Staffing. How many nurse hours each resident gets per day, adjusted for how sick the residents are, and reported from payroll data rather than from what the home says. Registered nurse hours are weighted separately, because they are the hours most strongly associated with outcomes.
Quality measures. Clinical outcomes the home reports: pressure ulcers, falls with injury, antipsychotic medication use, hospital readmissions, and others.
The three are combined with health inspections dominating — which is the right emphasis, and worth remembering when a home points you at the component it does best on.
How to read it properly
Look underneath the overall star. A 4-star overall built on 5-star quality measures and 2-star inspections is a different building from one built on the reverse. Health inspections are the hardest of the three to influence from a desk.
Compare within the state, not across the country. The health inspection star is scored on a curve within each state, because state survey agencies differ in how strictly they inspect. A 3-star home in a tough state may run better than a 4-star home in a lenient one. The comparison that means something is against neighbors.
Read the deficiencies, not just the count. Two homes with the same number can be completely different: a paperwork finding and a finding of actual harm both count as deficiencies. Scope and severity are published; a pattern of the same issue across years says more than any single finding.
Check staffing turnover. CMS publishes nurse and administrator turnover alongside the staffing rating, and high turnover is one of the most telling numbers on the page. A home that cannot keep its staff is a home where nobody knows your mother.
Check the date. Ratings update on a schedule and a home can change quickly, in both directions. New ownership, a new director of nursing, a bad quarter — all of it moves faster than the rating does.
The three things it will not tell you
Whether it covers assisted living. It does not. CMS certifies and inspects nursing homes. If you are looking at assisted living or memory care, there is no federal rating — you are relying on state licensing records, which vary enormously in what they publish and how easy they are to find. Your state's licensing agency and long-term care ombudsman are the places to ask.
What it is like to live there. No inspection measures whether staff know residents by name, whether the food is worth eating, whether anyone comes when the call light goes on at 3am. Those are visit questions.
Whether it will be like this next year. The rating is a record of the past. Ownership changes are public and worth checking — a chain acquisition is often followed by staffing changes.
What to do with a low rating
A 1- or 2-star rating is not automatically disqualifying, but it moves the burden of proof onto the home. Ask what the deficiencies were, what changed afterwards, and whether the leadership that oversaw them is still there. Ask the state ombudsman about complaints. Then visit — twice, once unannounced, once at a mealtime or in the evening when staffing is thinnest.
And read a high rating with the same care. Five stars is a reason to visit, not a reason to skip visiting.
Where we show it
Every federally certified nursing home in our directory carries its CMS rating on its profile and on the listings, colored by what the rating actually means rather than uniformly reassuring. Where a community is state-licensed only — most assisted living — we show no rating rather than invent one, and say so.