Home Care Quality Measures: HHCAHPS, Star Ratings, and Outcome Metrics

Home care quality measurement in the United States operates through a structured federal framework that links patient survey data, clinical outcome tracking, and publicly reported performance scores to Medicare reimbursement and consumer transparency. This page covers the three primary instruments — the Home Health Consumer Assessment of Healthcare Providers and Systems (HHCAHPS), the CMS Home Health Star Ratings, and the OASIS-derived outcome and process measures — explaining how each is constructed, what it measures, and where the classification boundaries between them lie. Understanding these tools is essential for interpreting agency performance data published on the CMS Care Compare platform.

Definition and scope

Home care quality measures are standardized instruments used by the Centers for Medicare & Medicaid Services (CMS) to assess the performance of Medicare-certified home health agencies (HHAs) across three distinct domains: patient-reported experience, functional and clinical outcomes, and adherence to evidence-based care processes.

HHCAHPS is a nationally standardized patient experience survey administered by CMS-approved third-party vendors. It captures responses from Medicare beneficiaries who received home health visits, covering domains such as care of patients, communication between providers, and overall rating of care. The survey instrument contains 34 items, of which a subset generates publicly reported measures (CAHPS Home Health Care Survey, AHRQ).

Star Ratings are composite scores displayed on CMS Care Compare (formerly Home Health Compare). Agencies receive separate star scores for quality of patient care (derived from OASIS-based measures) and patient survey experience (derived from HHCAHPS). Each dimension uses a 1–5 star scale, with ratings calculated using a linear mean-scoring methodology and updated on a rolling basis.

OASIS-based outcome and process measures derive from the Outcome and Assessment Information Set (OASIS), a federally mandated clinical assessment instrument completed by clinicians at the start of care, at 60-day recertification, at resumption of care, and at discharge. OASIS-E, the version in effect as of January 2023, contains structured data elements that feed into measures tracked in the Home Health Quality Reporting Program (HHQRP).

Scope is limited to Medicare-certified HHAs. State-licensed but non-Medicare-certified agencies are not subject to HHCAHPS reporting requirements or OASIS submission obligations, creating a distinct regulatory boundary described further in home-care-licensing-by-state and certified-home-health-agency-standards.

How it works

The three measurement systems operate through separate data pipelines that converge on public reporting.

HHCAHPS data pipeline:

1. CMS identifies eligible patients — those who received at least 2 home health visits during the reporting period under Medicare fee-for-service or Medicare Advantage.
2. An approved third-party survey vendor administers the survey by mail, telephone, or a mixed-mode protocol within a defined window after the care episode ends.
3. Completed surveys are submitted to the HHCAHPS Data Center, operated by RTI International under CMS contract.
4. Case-mix adjustment is applied to control for patient characteristics including age, self-rated health status, and number of chronic conditions, producing adjusted scores.
5. Adjusted scores are publicly reported on Care Compare quarterly.

Agencies must achieve a minimum of 40 completed surveys over a 12-month period to receive publicly reported HHCAHPS scores (CMS HHCAHPS Protocols and Guidelines Manual).

OASIS-based measure pipeline:

Clinicians — typically registered nurses completing skilled nursing at-home assessments or therapists conducting physical therapy home care evaluations — complete OASIS items electronically at mandated time points. Agencies transmit OASIS data to the CMS OASIS Submission System. CMS calculates outcome measures by comparing patient status at start of care against status at discharge or transfer, generating improvement and stabilization rates across functional and clinical domains.

Key OASIS-derived measures include:
- Improvement in ambulation
- Improvement in bathing
- Improvement in dyspnea
- Acute care hospitalization rate
- Emergency department use without hospitalization rate
- Discharge to community rate

Process measures — such as the rate of timely initiation of care (within 2 days of referral) — are calculated from OASIS response patterns rather than outcome comparisons.

Star Rating calculation:

Quality of patient care star ratings incorporate a standardized set of measures drawn from OASIS submissions. Patient survey star ratings are calculated separately from HHCAHPS composite scores. CMS applies a clustering algorithm to assign star categories, ensuring that approximately 10% of agencies fall in each star band relative to national distribution. This means star ratings reflect relative performance within the national HHA population, not absolute performance against fixed thresholds.

Common scenarios

Scenario 1 — New agency startup: A newly Medicare-certified agency begins OASIS submission immediately upon treating Medicare beneficiaries. However, star ratings and HHCAHPS scores do not appear on Care Compare until the agency has accumulated sufficient data volume — typically 20 or more OASIS records for outcome measures and 40 completed surveys for HHCAHPS. During this period, the agency appears on Care Compare without star ratings displayed. The oasis-assessment-home-health reference covers submission requirements in detail.

Scenario 2 — Low-volume rural agency: An agency serving a sparsely populated rural county may consistently fall below the 40-survey threshold for HHCAHPS reporting. Such agencies receive OASIS-based quality star ratings if they meet the volume floor for outcome measures, but their Care Compare profile will show no patient survey star rating. This creates an asymmetric public profile that does not reflect poor performance — only insufficient sample size.

Scenario 3 — Post-acute transition care: Agencies primarily serving post-acute home care populations — patients discharged from hospitals or skilled nursing facilities — frequently treat higher-acuity patients, which affects unadjusted outcome rates. OASIS-based measures use risk adjustment to account for patient complexity, but the adjustment methodology does not capture all comorbidity variation, making direct agency-to-agency comparison imprecise without reviewing patient population context.

Scenario 4 — Hospice and palliative boundary: Agencies providing palliative care at home under the Medicare home health benefit (distinct from the Medicare hospice benefit) remain subject to HHCAHPS and OASIS requirements. Agencies operating exclusively under the Medicare hospice benefit are subject to the separate Hospice CAHPS instrument and are not included in Home Health Star Ratings.

Decision boundaries

Several classification distinctions govern which measures apply to which agencies and patient populations.

Medicare-certified vs. non-certified agencies: Only Medicare-certified HHAs are required to submit OASIS data and participate in HHCAHPS. State-licensed non-certified agencies providing home-health-aide-services under private pay or Medicaid personal care programs are governed by state-specific reporting frameworks, not the federal HHQRP. The medicare-home-health-benefit page details certification criteria.

OASIS completion thresholds by discipline:

Outcome vs. process measures: Outcome measures assess whether a patient's condition changed between two time points. Process measures assess whether a specified clinical action was performed, regardless of outcome. A high process measure score does not guarantee high outcome scores, and vice versa. CMS reports both categories under the quality of patient care star rating but weights them according to the HHQRP measure set in effect for the reporting period.

HHCAHPS vs. Care Compare star rating: HHCAHPS generates raw survey composites across four publicly reported domains: care of patients, communications between providers, specific care issues, and overall rating of the agency. The patient survey star rating displayed on Care Compare is derived from a subset of HHCAHPS items using the star-rating methodology, not directly from raw composite scores. An agency can have a favorable raw HHCAHPS composite but a 3-star patient survey rating if its performance, while acceptable, falls at the median of national distribution.

Safe care and risk flagging: CMS flags agencies on Care Compare when specific adverse process or outcome patterns are detected. An agency hospitalization rate substantially above the national average triggers display of a warning indicator. The fall-prevention-home-care and infection-control-home-care domains, while not generating standalone star ratings, contribute to OASIS-derived process measures that appear in agency profiles.

References

• CAHPS Home Health Care Survey — Agency for Healthcare Research and Quality (AHRQ)
• Home Health Quality Reporting Program — Centers for Medicare & Medicaid Services (CMS)
• CMS Care Compare (Home Health)
• HHCAHPS Protocols and Guidelines Manual — Home Health CAHPS
• OASIS Data Submission — CMS
• [Home Health Star Ratings Methodology — CMS](https://www.cms.gov/medicare