CMS just made its Star Ratings math less forgiving, and the change lands squarely on the member service line. The Contract Year 2027 Final Rule, issued in April 2026, removes 11 measures from the Medicare Advantage and Part D Star Ratings, most of them administrative or process measures that CMS said no longer meaningfully distinguished one plan from another.1 Removing them does not simply shrink the scorecard. It reweights it. With fewer measures in the total, CMS has tilted relative weight toward the survey based and clinical outcome measures that remain, and several of the survey measures that gained ground are shaped directly on member calls.2
For a Medicare Advantage plan, that raises the stakes on a part of the operation many still treat as a cost center. In a smaller measure set, a weak call center is no longer a contained quality problem. It is a direct drag on the overall rating and the quality bonus payment that depends on it.
The measure set just got smaller
Some context on where ratings sit. The 2026 enrollment weighted average Star Rating for Medicare Advantage plans with drug coverage was 3.98, and only about 40 percent of MA contracts earned four stars or higher, the threshold that triggers a quality bonus payment.3 Most plans are already sitting below the line that funds richer benefits.
Into that tight environment, the Contract Year 2027 rule removes 11 measures and tilts relative weight toward the survey based and clinical outcome measures that remain.4 Patient experience and access measures already had their weight cut from four times to two times for the 2026 ratings, so member experience carries less raw weight than it did a few years ago.5 What the removals change is the denominator. With the low differentiation measures gone, the surviving CAHPS experience measures are a larger share of a smaller set. Clinical HEDIS measures gain the most, but they move slowly. Among the measures a plan can influence quickly through daily operations, the CAHPS experience measures are the most reachable, and the call center shapes several of them.
Several of the survivors are decided on the phone
The experience measures CMS kept lean heavily on what members actually go through, and much of that happens on a call. Surviving CAHPS composites such as customer service, getting needed care, getting appointments and care quickly, and overall rating of the plan are shaped directly by how member calls go. When a member cannot get a question resolved, is transferred repeatedly, or feels unheard, that experience surfaces later as a lower survey score.
There is a sharper point in the timing. Among the measures CMS removed were the ones that used to grade call center and complaint handling directly, including the appeals timeliness, plan complaints, and call center interpreter measures. The call center lost its own dedicated scorecard, yet the experience it drives still flows into the CAHPS survey measures that remain. The rating exposure did not go away. It moved into measures where a sampling based QA program cannot tell a plan why a score moved.
What this looks like in practice: a plan's customer service composite has been flat for two years. Leadership assumes the scripts and training are fine because the quarterly QA sample looks clean. The sample, a few hundred manually scored calls, never surfaces the systemic issue, a recurring transfer loop on benefit questions, because it lives in calls that were never selected. The composite stays flat, and in a smaller measure set that flat score costs more than it used to.
Why sampling is now a ratings risk, not just a quality gap
Traditional call center QA reviews a small manual sample, historically a few percent of calls, and scores it well after the interaction. That model was always a blind spot. In a concentrated Star Ratings environment, it becomes a financial one.
When a plan reviews less than 5 percent of its member calls, it is inferring the experience behind measures that now move its rating and its bonus payment from a fraction of the evidence. Non-English calls are rarely sampled at all, which means the experience of entire language groups goes effectively unmeasured, even as those calls feed the same composites. A sample can tell a plan that a composite is stuck. Only the full population of calls can tell it why. The contrast between the two models is direct.
What to look for in a member experience solution
Improving the experience measures that now carry more weight starts with actually seeing them. When evaluating how to monitor and improve member calls, plans should look for:
- Evaluation of every member call rather than a sample, so systemic issues surface instead of hiding in unselected calls
- Scoring tied to the experience measures that drive ratings, including customer service quality and complaint drivers
- Translation and scoring of calls in every language, so no member group goes unmeasured
- Root cause visibility that explains why a composite is stuck, not just that it is
- Intelligence the plan owns and controls, rather than quality metrics self reported by a vendor
Claro by Mizzeto was built to give plans that full view. Its Member Sentiment & At-Risk Identification and Agent Empathy & Communication scoring evaluate 100 percent of member calls in any language, turning the experience behind CAHPS composites into something a plan can measure and improve rather than infer.
The bottom line
The Contract Year 2027 rule did not lower the bar for member experience. By removing the measures plans could coast on, it left the surviving experience measures carrying more of what a plan can actually influence, with no dedicated call center scorecard to flag trouble early. In a concentrated Star Ratings set, a member service operation measured by sampling is a rating left partly to chance. Plans that can see every call can find and fix what is holding a composite down, while plans reviewing a small sample keep guessing. To see how full call scoring maps to the Star Ratings measures that now carry the most weight, send us a sample of your calls and we will return scored transcripts before you commit to anything.
References
1. Crowell & Moring LLP, CMS Finalizes CY 2027 Medicare Advantage and Part D Rule: Key Implications for Plan Sponsors. https://www.crowell.com/en/insights/client-alerts/cms-finalizes-cy-2027-medicare-advantage-and-part-d-rule-key-implications-for-plan-sponsors
2. Becker's Payer Issues, CMS pitches star ratings reform in 2027 Medicare Advantage rule: 7 notes. https://www.beckerspayer.com/payer/medicare-advantage/cms-pitches-star-ratings-reform-in-2027-medicare-advantage-proposed-rule-7-notes/
3. Cohere Health, CMS Star Ratings 2027 Final Rule: Health Plan Impacts (citing the CMS 2026 MA and Part D Star Ratings Fact Sheet). https://www.coherehealth.com/blog/cms-star-ratings-2027-final-rule-health-plans
4. CMS, Contract Year 2027 Medicare Advantage and Part D Final Rule fact sheet (April 2, 2026). https://www.cms.gov/newsroom/fact-sheets/contract-year-2027-medicare-advantage-part-d-final-rule
5. AJMC, The Stars Have Realigned (Again): What Medicare Advantage Plans Need to Know. https://www.ajmc.com/view/contributor-the-stars-have-re-aligned-again-what-medicare-advantage-plans-need-to-know




















