5-Star Quality Rating decoded

Care Compare assigns every nursing home a one-to-five star rating on each of three domains — Health Inspections, Staffing, and Quality Measures — and a fourth overall composite star drawn from the three. The star you see on Care Compare drives family decisions, payor network inclusion, and lender confidence. A single bad survey or a single quarter of missing data can cost a full star and keep it depressed for three years.

This guide walks through what each domain measures, how the overall star is calculated, the caps and floors that constrain the math, and the realistic recovery path after a star drop.

The three component stars

Care Compare displays four stars on each facility page: an overall star and three domain stars. The domain stars are the building blocks.

• Health Inspection star.Derived from the facility’s deficiencies on the last three standard surveys and any subsequent complaint surveys, weighted by Scope and Severity letter and survey recency. The highest- weight domain in driving the overall star.
• Staffing star. Derived from PBJ-reported nursing hours, case-mix-adjusted, with separate consideration for RN HPRD, weekend staffing, and staff turnover.
• Quality Measures star. Derived from MDS assessments and Medicare claims data on long-stay and short-stay resident outcomes. Re-calculated quarterly.

Each domain star runs one to five. Each is independent until the overall star calculation, where caps and floors enforce consistency.

Health Inspection star

The Health Inspection star is calculated from a point-weighted deficiency score covering:

• Every deficiency cited on the most recent three standard surveys.
• Every deficiency cited on intervening complaint surveys.
• Revisit findings — second and third revisits add weight.

Each deficiency contributes points based on its Scope and Severity letter. The point structure weights heavily toward higher letters: a single J-level deficiency contributes substantially more points than a dozen D-level deficiencies. The most recent survey cycle weights heaviest; older surveys weight progressively less.

After point totals are summed, facilities are ranked within their state. The state ranking determines the star: roughly the top 10% by point total get five stars, the next 23% get four, the next 23% get three, the next 23% get two, and the bottom 21% get one. The percentiles vary slightly state to state.

Practical implication: the Health Inspection star reflects relative performance, not absolute. A facility with a clean survey in a state with widespread good performance might still end up at a three-star Health Inspection rating. A facility with several deficiencies in a state with high overall deficiency counts might still land at four.

Staffing star

The Staffing star is calculated from PBJ-reported nursing hours, transformed to case-mix-adjusted Hours Per Resident Day. Current methodology weights:

• Total nursing HPRD. RN + LPN + CNA hours per resident day, case-mix-adjusted.
• RN HPRD. Registered Nurse hours per resident day, separately calculated because RN coverage drives clinical outcomes.
• Weekend staffing. Saturday and Sunday HPRD, weighted independently because weekend coverage has historically lagged weekday levels.
• Turnover. RN turnover and total nursing turnover, calculated from quarter-over-quarter PBJ hour patterns. High turnover lowers the star.

Each component contributes to the staffing star, with thresholds for each star level published by CMS. The methodology has been tightened in recent revisions — turnover and weekend staffing weighting both increased, and the thresholds for higher stars have risen.

For the mechanics of PBJ submission and the common errors that lower the staffing star unintentionally, see our PBJ guide.

Quality Measures star

The Quality Measures star is calculated from a set of clinical outcome measures derived from MDS assessments and Medicare claims data. The measures fall into two groups:

• Long-stay measures. Indicators relevant to residents whose stay exceeds 100 days. Examples include the percentage of residents with pressure ulcers, the percentage who fell with major injury, the percentage receiving antipsychotic medications, and the percentage with urinary tract infections.
• Short-stay measures. Indicators relevant to residents whose stay is 100 days or less. Examples include improvement in function, successful return to community, rehospitalization within 30 days, and emergency department visits.

Each measure is risk-adjusted for resident characteristics — a facility with a population at high risk for pressure injuries is not penalized for higher pressure-injury rates if those rates are in line with the risk-adjusted expectation.

Measure-level performance is converted to facility-level points; the points sum to the QM star. The QM star is recalculated each quarter as new MDS and claims data flow in.

The overall star calculation

The overall five-star rating combines the three domain stars with the Health Inspection star carrying the heaviest weight. The formula starts with Health Inspection and then adds or subtracts based on Staffing and Quality Measures:

1. Start with the Health Inspection star.
2. Add one star if Staffing is four or five stars; subtract one star if Staffing is one star (subject to limits).
3. Add one star if Quality Measures is five stars; subtract one star if Quality Measures is one star.
4. Apply caps and floors.

Caps and floors that constrain the math

Several constraints enforce consistency:

• Health Inspection 1-star cap. A facility with a one-star Health Inspection rating cannot have an overall rating higher than four stars regardless of Staffing or QM performance.
• Staffing 1-star cap. A facility with a one-star Staffing rating cannot have an overall rating higher than three stars.
• Special Focus Facility designation. SFF designation pushes the overall rating down regardless of domain stars; SFF facilities are generally one or two stars overall.
• Missing PBJ submissions. A quarter without PBJ submission is treated as very low staffing for purposes of the star calculation, often producing a one-star Staffing rating for the affected period.
• Quality Measures floor. Limitations apply when QM data is incomplete; a facility without sufficient recent MDS or claims data may receive a default rating rather than a calculated one.

How a survey affects the star

Survey impact on the Health Inspection star — and therefore on the overall — runs on a defined cycle:

1. The survey is conducted. Deficiencies are cited with Scope and Severity letters.
2. The CMS-2567 is finalized. Deficiencies become part of the facility’s record.
3. Care Compare is refreshed (typically quarterly). The deficiency points are added to the Health Inspection score. The star is recalculated.
4. The deficiency points decay over time as newer surveys replace older ones in the three-cycle window. After approximately 36 months — three standard survey cycles — a deficiency’s contribution to the star approaches zero.

Practically, a bad survey costs a facility a full star or more, depending on Scope and Severity of the deficiencies and the comparative ranking in the state. Recovery requires either time (three years for the bad cycle to fall out of the window) or substantially better subsequent surveys that bring the cumulative score back up.

Recovery path

After a star drop, facilities have several levers:

• IDR and IIDR. Reducing deficiency Scope and Severity letters through dispute lowers the point contribution of the affected deficiencies, which can improve the Health Inspection star within the next quarterly refresh.
• Clean follow-up surveys. Subsequent surveys with fewer and lower-severity deficiencies pull the cumulative score up. Two clean surveys in a row can recover most of a one-star drop within 18–24 months.
• Staffing improvement. Increasing total nursing HPRD, RN HPRD, weekend coverage, and reducing turnover all improve the Staffing star. Because Staffing can add to the overall rating when at four or five stars, a strong Staffing performance can partially offset Health Inspection issues.
• Quality Measure work. Targeted clinical improvement projects — pressure injury reduction, antipsychotic reduction, falls reduction — can move QM measures and the QM star within two to four quarters.
• MDS accuracy. Some QM measures are sensitive to MDS coding accuracy. Improving MDS coding quality often produces measure-level improvements without changing underlying clinical practice.

What the star actually controls

Care Compare star ratings drive a meaningful share of family selection decisions, payor decisions, and lender decisions:

• Family selection. Most consumer guides and search tools surface the Care Compare star prominently. A four-or-five star rating drives referrals; a one-or-two star rating drives avoidance.
• Medicare Advantage networks.Some plans set minimum star thresholds for in-network facility status. Facilities below the threshold lose referrals from the plan’s case-management network.
• State Medicaid programs. Some states factor star ratings into supplemental payment programs or value-based payment models.
• Lender and insurance terms. Commercial lenders and professional liability insurers watch star ratings as part of underwriting. A sustained star drop tightens terms or shifts coverage costs.
• Staff recruitment. Star ratings affect staff perception of the facility, which compounds staffing problems at lower-star facilities.

Common questions

The pattern, summarized

The five-star rating is three component stars plus a composite, with Health Inspection as the dominant driver and Staffing/QM as modifiers. Caps and floors keep the math honest — a one-star Staffing or Health Inspection rating restricts how high the overall can go regardless of other domains.

Recovery from a star drop runs on multi-year cycles because the Health Inspection window is three years. The work is in clean subsequent surveys, careful PBJ submission, and steady QM improvement — and where warranted, IDR or IIDR on the deficiencies that drove the drop in the first place.