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🌟 '''Star rating system''' is a structured evaluation framework that assigns graded scores — usually on a scale of one to five stars — to insurance products, plans, or carriers based on predefined performance criteria. Within the U.S. insurance industry, the most consequential example is the [[Definition:Centers for Medicare & Medicaid Services (CMS) | CMS]] Star Rating System, which evaluates [[Definition:Medicare Advantage | Medicare Advantage]] and [[Definition:Medicare Part D | Part D prescription drug]] plans annually. Beyond government programs, the concept extends to proprietary rating systems used by industry research firms and [[Definition:Insurtech | insurtech]] comparison platforms to benchmark [[Definition:Insurance carrier | carriers]] across [[Definition:Line of business | lines of business]].

📏 A star rating system works by defining a set of measurable performance indicators, assigning thresholds or benchmarks for each, scoring the evaluated entity against those benchmarks, and then aggregating the individual scores into an overall composite rating. The CMS system, for example, draws on over 40 measures grouped into categories such as staying healthy (preventive screenings), managing chronic conditions, member experience and complaints, customer service, and pharmacy services. Each measure is scored on a one-to-five scale, and the scores are weighted — with outcome and patient-experience measures typically receiving higher weights — to produce a final [[Definition:Star rating | star rating]]. The entire methodology is published annually, giving plans a transparent roadmap for [[Definition:Quality improvement | quality improvement]] initiatives.

📈 Designing and responding to a star rating system requires significant investment from insurers but yields proportional rewards. Plans that reach four or five stars under CMS receive [[Definition:Quality bonus payment | quality bonus payments]] that can amount to millions of dollars in additional [[Definition:Revenue | revenue]], while also gaining access to year-round [[Definition:Special enrollment period (SEP) | special enrollment periods]] that lower-rated competitors cannot offer. This creates a virtuous cycle: higher ratings attract more [[Definition:Enrollment | enrollees]], more enrollees generate greater [[Definition:Premium | premium volume]], and increased resources fund further quality improvements. Outside of Medicare, private star rating systems influence [[Definition:Distribution channel | distribution]] dynamics — an insurer consistently rated five stars on a major comparison site gains organic visibility that reduces [[Definition:Customer acquisition cost (CAC) | customer acquisition costs]]. As a result, many carriers now employ dedicated teams focused on star-rating optimization as a core component of their competitive strategy.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Star rating]]
* [[Definition:Medicare Advantage]]
* [[Definition:Centers for Medicare & Medicaid Services (CMS)]]
* [[Definition:Quality bonus payment]]
* [[Definition:Customer satisfaction score]]
* [[Definition:Health plan accreditation]]
{{Div col end}}

Definition:Star rating system - Revision history

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