Star Ratings and Your Agency's Portfolio: Why a 4.5-Star Carrier Outperforms a 3.0-Star One

Why the Star Tier Drives Your Book

What a Star Rating Actually Measures

CMS Star Ratings consolidate roughly forty individual measures across health-plan domains — preventive screenings, chronic-condition management, member experience, complaints and appeals, customer service, and (for Part D) pharmacy access and adherence. CMS publishes the methodology and the annual results on the Part C and D Performance Data page. The Kaiser Family Foundation publishes an excellent annual Star Ratings analysis that breaks down the year-over-year movement.

From the agency seat, the operationally important features are: (1) Star Ratings come from CMS's view of how members experience the plan over the previous year — including complaints; (2) carriers receive Quality Bonus Payments at 4+ Stars that fund supplemental benefits and lower out-of-pocket costs; and (3) 5-Star contracts get a year-round SEP that lets agencies enroll outside AEP without invoking other SEPs.

The Persistency Gap by Star Tier

We track this in the agency books we work with: persistency at month 12 is materially higher on 4.5+ Star contracts than on sub-3.5 Star contracts, often by 10-15 percentage points. The reason is mechanical, not aesthetic. A 4.5+ Star plan typically has fewer formulary disruptions, broader networks, lower call-center complaint rates, and richer supplemental benefits — all of which reduce the friction that drives early disenrollment. The agency captures that persistency as commission survival.

The Commission-Trap: Why the Higher Grid Doesn't Always Win

When a 3-Star carrier offers a $50 higher per-policy commission than the 4.5-Star carrier in the same county, the agency feels the pull. The math gets there in year two. A book that is 12 percentage points more persistent on a 4.5-Star contract earns more renewal commission, has lower CTM ratio (which protects the writing number), and generates fewer service-call hours per member-year. The 3-Star "premium" usually evaporates before the second renewal cycle.

The 5-Star SEP as a Year-Round Asset

The 5-Star SEP allows beneficiaries to enroll in a 5-Star contract once between December 8 and November 30 of the following year — effectively year-round, outside of AEP. Agencies that contract with 5-Star carriers have a permanent enrollment lane that competitors with only 3 and 4-Star carriers do not. This is a tangible operational asset, particularly for agencies whose marketing engines run year-round.

Note that 5-Star contracts are uncommon in any given year, and they shift annually. CMS publishes the 5-Star list each fall. We covered the year-round enrollment lanes more broadly in our pieces on SEP/AEP/OEP windows and the SEP opportunities discussion.

Building the Star-Aware Carrier Stack

From a portfolio-construction perspective, recommend a four-to-six carrier stack with the following bias:

Reporting the Star-Tier Mix to Carriers

Carrier underwriting and account management teams notice agencies that bias toward higher-Star contracts. The narrative — "we route deliberately toward 4+ Star plans because our persistency math says it pays back" — is exactly what national carrier directors want to hear in QBR meetings. It also signals operational maturity, which directly affects override negotiations, co-op spend, and lead allocation. We covered the broader carrier-relationship dynamics in our five-factor carrier-stack framework.

Key Takeaways for Agency Operators

Star Ratings are the cheapest persistency strategy in Medicare because they cost the agency nothing to use as a portfolio filter. The commission grid is a year-one signal; the Star Rating is a four-year signal. Agencies that build the stack around higher-Star carriers compound the difference into a portfolio that quietly outperforms the market every renewal cycle.