California Nursing Home Star Ratings Explained: How to Read CMS Ratings in 2026
Understand the overall rating, health inspections, staffing, quality measures, California comparisons, federal alerts, and what families should still investigate before choosing a nursing home.
What do CMS nursing home star ratings mean?
The Centers for Medicare & Medicaid Services created the Five-Star Quality Rating System to help residents, families and caregivers compare nursing homes. Nursing Home Care Compare displays an overall rating from 1 to 5 stars and separate ratings for three major domains:
- Health inspections — results from state and federal survey activity, including standard inspections and certain complaint or infection-control findings.
- Staffing — nursing staffing information derived from auditable Payroll-Based Journal data and adjusted for resident needs.
- Quality measures — selected measures based on resident assessment data and Medicare claims.
CMS describes five-star homes as having quality that is much above average and one-star homes as having quality that is much below average. CMS also cautions that no rating system can capture every factor that matters to an individual resident, including specialty services, location and ease of family visitation.
How is the overall CMS nursing home rating calculated?
The overall rating is not a simple mathematical average of the three domain ratings. The health inspection rating is the starting point and has the strongest influence.
- Start with the health inspection rating.
- Staffing may change it. A five-star staffing rating can increase the overall result by one star under CMS rules, while a one-star staffing rating reduces it by one star.
- Quality measures may change it again. A five-star quality-measure rating can increase the result by one star, while a one-star quality-measure rating reduces it by one star.
- CMS limits upgrades from a poor inspection record. When the health-inspection rating is one star, the overall rating cannot be raised by more than one star based on staffing and quality measures.
The health inspection rating
The health inspection domain reflects findings from onsite regulatory surveys. CMS currently uses findings from the nursing home's two most recent standard health inspections, along with certain complaint, facility-reported incident and infection-control investigations over the applicable three-year period.
Deficiencies receive points based on severity and scope. More serious or widespread deficiencies receive more points. Additional points may be added when a facility requires revisits because cited problems were not corrected. In this system, a lower inspection score is better.
CMS places greater emphasis on more recent survey findings. Complaint deficiencies and certain infection-control findings can also affect the score.
Health inspection stars are relative to other homes in California
This is an especially important detail for California families. CMS assigns health-inspection stars based on a nursing home's performance relative to other nursing homes within the same state. The top 10% of facilities with the lowest weighted inspection scores in a state receive five stars, the bottom 20% receive one star, and the middle 70% are divided approximately evenly among two, three and four stars.
That means a California home's health-inspection rating is primarily a comparison with other California facilities—not a national absolute grade.
Families should therefore examine the actual deficiencies, their severity, whether they recur and how recently they occurred. Our California nursing home selection guide explains how inspection history should fit into the larger decision.
The staffing rating
CMS staffing ratings are based on staffing information submitted through the federal Payroll-Based Journal (PBJ) system. PBJ captures paid employee and contract/agency staffing and is designed to provide auditable daily staffing information.
Staffing is important because residents depend on nurses and nursing assistants for medications, assessments, toileting, transfers, repositioning, feeding assistance, supervision and recognition of changes in condition.
CMS staffing methodology considers nursing hours per resident day and adjusts expectations based on the needs of a facility's residents. Care Compare also provides useful related information such as weekend staffing and turnover.
California has its own separate staffing requirements. As of January 1, 2026, state law requires a quarterly minimum average of 3.58 hours of direct nursing care per resident per day, an RN on the premises 24 hours a day, and additional staffing when resident needs require more than the numerical minimum. See our California nursing home staffing guide for the state-specific requirements.
The quality measure rating
The quality-measure domain uses selected clinical measures to describe outcomes or care processes for nursing home residents. CMS currently uses a subset of the quality measures published on Care Compare to calculate the star rating.
The measures include both short-stay and long-stay residents. Short-stay measures generally relate to residents who stay 100 days or less or receive Medicare Part A skilled nursing facility care. Long-stay measures evaluate people who reside in the facility for longer periods.
Depending on the measure, the data may come from the federally required Minimum Data Set (MDS) resident assessments or from Medicare claims. CMS currently calculates the quality-measure rating using the most recent four quarters of available data, with different measures receiving different weights.
Examples of areas represented in publicly reported quality data can include rehospitalization, emergency-department use, falls, pressure injuries, antipsychotic medication use and other resident outcomes or care processes.
What do warning icons, Special Focus Facility status and missing ratings mean?
Care Compare may display additional alerts that deserve attention beyond the stars.
Special Focus Facilities
The federal Special Focus Facility program targets nursing homes with a history of serious quality problems. CMS suppresses star ratings for current Special Focus Facility participants and displays a warning indicator instead. If a facility appears in or has recently left the program, review its inspection history carefully.
Abuse-related information
Care Compare can also flag facilities with recent abuse citations meeting CMS criteria. Families should open the inspection details rather than relying only on the symbol.
“Not Available” ratings
A missing rating does not automatically mean good or bad quality. For example, a newer nursing home may not yet have enough standard health inspections for CMS to calculate a health-inspection rating. Under current CMS methodology, when a facility lacks the required health-inspection rating, an overall rating is not assigned and other domain ratings may also be suppressed.
Why can a nursing home's star rating change?
Ratings can change when new information enters any of the three domains. Examples include:
- A new standard health inspection.
- New complaint or infection-control deficiencies.
- Changes in staffing data or turnover.
- New quality-measure data.
- Changes in CMS thresholds or methodology.
- A facility entering or leaving Special Focus Facility status.
Because ratings change, always check the current Care Compare record rather than relying on an old screenshot, brochure or advertisement.
How California's nursing home quality reporting fits in
The California Department of Health maintains its own nursing-home quality resources in addition to federal Care Compare data. California Department of Public Health (CDPH)'s Nursing Home Summary Report combines information from CMS and state sources to help consumers compare facilities.
California reporting can provide additional context involving resident and family satisfaction, inspections, staffing and quality information. Because individual measures may cover different reporting periods, read the report's methodology and dates rather than assuming every figure describes the same month or quarter.
Use our California nursing home directory and comparison tool to begin comparing facilities, then confirm current details through California Department of Public Health (CDPH) and Medicare Care Compare.
How families should use nursing home ratings
The star system works best as a question generator, not as an automatic decision-maker.
A practical rating review
- Start with the overall rating to identify the general CMS assessment.
- Open the health inspection rating and review actual deficiencies, severity and dates.
- Check staffing separately, including RN staffing, weekend staffing and turnover.
- Review short-stay or long-stay quality measures that match the resident's expected type of stay.
- Look for federal warning indicators, abuse-related information or Special Focus Facility status.
- Compare California state information rather than relying only on federal stars.
- Visit the facility and compare what you observe with the published data.
- Ask about any weak result and request a specific explanation of what has changed.
What a five-star rating cannot tell you
Even a five-star nursing home may not be suitable for a specific person. Ratings do not tell you whether the facility has the right dementia program, rehabilitation services, physician coverage, language capability, room availability, proximity to family, or culture for that resident.
A high rating also does not guarantee that a resident will never experience a fall, infection, pressure injury, medication error or other adverse event. Conversely, a lower rating does not by itself prove that every resident receives poor care.
Before admission, combine the ratings with an in-person visit and the resident's clinical requirements. See our complete California nursing home selection guide.
If the data and your experience do not match
If a current resident is experiencing repeated care problems despite apparently strong ratings, document the actual events and address them directly. Published ratings describe facility-level performance; they do not override what is happening to an individual resident.
Our nursing home warning signs guide can help families identify patterns worth investigating. For unresolved concerns, see our California nursing home complaint guide.