HMO Quality Ratings and NCQA Accreditation

HMO quality ratings and accreditation status are two of the most concrete tools available for comparing health plan performance beyond premium price. The National Committee for Quality Assurance (NCQA) operates the dominant private accreditation program for managed care organizations in the United States, producing standardized scores that allow side-by-side evaluation of clinical quality, member satisfaction, and administrative performance. Understanding how these ratings are constructed — and what their limitations are — is essential for both employers selecting group coverage and individuals choosing among HMO plan options during open enrollment.

Definition and Scope

NCQA accreditation is a voluntary certification program for health plans, including HMOs, PPOs, and Medicaid managed care organizations. NCQA evaluates plans against standardized criteria and assigns one of five status designations: Excellent, Commendable, Accredited, Provisional, or Denied. Plans that do not submit for review receive no designation at all.

The primary measurement instrument NCQA uses is the Healthcare Effectiveness Data and Information Set (HEDIS), a set of more than 90 performance measures covering domains such as preventive care, chronic disease management, and behavioral health. HEDIS data is collected from claims records and clinical chart reviews, then audited by certified NCQA-licensed organizations (NCQA, HEDIS Overview). The Consumer Assessment of Healthcare Providers and Systems (CAHPS) survey, administered by the Agency for Healthcare Research and Quality (AHRQ), adds member-reported experience data — covering topics like communication with doctors, timely appointments, and customer service.

Together, HEDIS and CAHPS scores feed into the NCQA Health Plan Ratings, published annually, which score plans on a scale of 0 to 5 in half-point increments (NCQA Health Plan Ratings). Separate from private NCQA ratings, the Centers for Medicare & Medicaid Services (CMS) publishes Star Ratings for Medicare Advantage HMOs on a 1-to-5-star scale, a distinct system with direct payment implications (CMS Medicare Star Ratings).

How It Works

The NCQA accreditation review process follows a structured sequence:

  1. Application and data submission — The health plan submits HEDIS data, CAHPS survey results, and documentation of internal quality management processes.
  2. Administrative review — NCQA reviewers examine plan policies for utilization management, credentialing of providers, member rights, and care coordination.
  3. On-site or virtual review — For full accreditation (as opposed to the Interim or Surveyor-Assisted pathways), NCQA reviewers assess documentation against published standards.
  4. Scoring and designation — Each domain is scored separately; the composite drives the final accreditation designation. Plans are re-evaluated on a three-year cycle for full accreditation.
  5. Public reporting — Results are posted in the NCQA Health Plan Search tool, accessible without charge at ncqa.org.

CMS Star Ratings operate on an annual cycle and use a different weighting methodology. In the 2024 measurement year, CMS applied a 0.75 reward factor for plans that scored above the 60th percentile on certain equity-related measures, reflecting a policy shift toward health equity weighting (CMS, 2024 Part C & D Star Ratings Technical Notes).

The referral and network coordination that defines HMO structure has a direct effect on HEDIS scores — closed-network plans can more reliably close care gaps for attributed members because the primary care physician relationship creates a clear accountability chain.

Common Scenarios

Employer group plan selection: An HR benefits team comparing three HMO bids may use NCQA accreditation status as a threshold filter, excluding any plan without at least an Accredited designation before evaluating cost. NCQA's how to evaluate an HMO network framework aligns with this approach.

Medicare Advantage HMO enrollment: A Medicare beneficiary choosing between two local HMOs may find one carries a 4.5-star CMS rating and another a 3-star rating. The higher-rated plan may receive a quality bonus payment from CMS, which can allow it to offer richer supplemental benefits — directly linking ratings to plan design.

State Medicaid managed care procurement: State Medicaid agencies in states such as California and Texas require contracted managed care organizations to maintain NCQA accreditation or an equivalent, making accreditation a condition of market participation rather than a voluntary differentiator.

Individual marketplace selection: On ACA-compliant exchanges, NCQA ratings are displayed alongside plan premiums on healthcare.gov in states that use the federal platform, giving consumers a standardized quality signal when comparing HMO plans during open enrollment.

Decision Boundaries

NCQA accreditation and quality ratings carry real informational value, but they do not resolve every plan selection question.

Ratings reflect aggregate performance, not individual network adequacy. A plan rated 4.5 stars nationally may have a thin provider network in a specific county. Accreditation status should be paired with a direct check of the provider directory for the relevant service area.

HEDIS measures lag by 12–18 months. Data submitted in a given year reflects care delivered in the prior measurement period, so a plan that recently restructured its quality programs may not yet show improvement in published scores.

Accreditation vs. ratings are distinct signals. A plan can hold NCQA Accreditation (a pass/fail threshold designation) while earning a below-average numeric rating on specific HEDIS domains. Both data points should be consulted independently.

CMS Star Ratings apply only to Medicare contracts. A plan's Medicare Advantage star score does not transfer to its commercial HMO products, which are measured under separate NCQA criteria. The HMO authority index provides a structured entry point for distinguishing which rating system applies to a given coverage type.

For members already enrolled who want to use quality information to navigate care decisions — including understanding grievance rights when quality failures occur — HMO consumer protections and grievance procedures details the regulatory backstops that operate alongside voluntary accreditation.

References

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)