Medicare Advantage 2027 Star Ratings: Changes & Cuts

1CMS Star Ratings Architecture & Key 2027 Methodology Shifts

The Centers for Medicare & Medicaid Services (CMS) calculates annual Star Ratings on a 1-to-5 scale (with 5 stars representing excellent performance) to evaluate the quality and customer experience of Medicare Advantage (Part C) and Medicare Prescription Drug (Part D) plans. The ratings synthesize approximately 40 distinct clinical, operational, and customer satisfaction measures drawn from HEDIS clinical records, CAHPS member surveys, and CMS administrative databases.

For the 2027 ratings cycle, CMS instituted several high-impact methodological changes. Most notably, the weighting for patient-reported health outcomes—specifically 'Improving or Maintaining Physical Health' and 'Improving or Maintaining Mental Health'—tripled from a weight of 1 to a weight of 3. In addition, CMS incorporated the Health Equity Index (HEI) reward mechanism and respecified Colorectal Cancer Screening measures, creating a more stringent distribution curve.

These technical adjustments made it mathematically harder for mid-tier health plans to secure 4.0 stars or higher, resulting in a dramatic contraction of bonus-eligible contracts from 229 down to 188.

• Tripled Measure Weighting: Patient-reported physical and mental health status now commands 3x weighting in final scores.
• Part D Medication Safety: Introduction of polypharmacy and concurrent opioid/benzodiazepine safety measures.
• Health Equity Index (HEI): Penalizes plans with wide disparity gaps in care delivery among dual-eligible and low-income subsidy (LIS) enrollees.

2The 4-Star Quality Bonus Cliff: Impact on Dental, Vision & OTC Benefits

Under the Affordable Care Act (42 U.S.C. § 1395w-23), Medicare Advantage plans that earn 4.0, 4.5, or 5.0 stars receive a statutory 5.0% Quality Bonus Payment (QBP) added directly to their county benchmark payment rate (and up to 10% in qualifying double-bonus counties). Furthermore, plans with 4.5 or 5.0 stars retain 70% of their bid-to-benchmark savings as rebates, compared to only 50% for plans rated below 3.5 stars.

This financial cliff represents tens to hundreds of millions of dollars in net operating revenue for major health insurers like Humana, UnitedHealthcare, Elevance, and CVS Aetna. When a contract drops from 4.0 stars to 3.5 stars, it loses 100% of its Quality Bonus funding. To absorb these revenue losses without running operating deficits, insurers are forced to scale back non-statutory supplemental benefits in 2027—including reducing dental annual maximums, shrinking OTC monthly debit card allowances, and increasing outpatient surgery copays.

3The 5-Star Special Enrollment Period (SEP): Switching Outside Open Enrollment

One of the most powerful consumer rights in the Medicare program is the 5-Star Special Enrollment Period (SEP). Typically, beneficiaries are locked into their plan choices once the annual Fall Open Enrollment Period ends on December 7 (with limited switching permitted during the MA Open Enrollment from January 1 to March 31).

However, if an elite 5-star Medicare Advantage or Part D plan is available in your service area, CMS permits you to switch into that 5-star plan at any time between December 8 and November 30 of the following year. With only 15 contracts achieving 5-star status for 2027, beneficiaries residing in service areas with a 5-star plan have a unique, year-round exit strategy if their current plan cuts provider networks or drops star ratings.