Medicare Advantage
maDefinition
ISO-11179 Definition
Medicare Advantage (MA), also known as Medicare Part C, is the private health plan alternative to traditional Medicare fee-for-service coverage, administered by CMS-approved commercial health plans. Medicare beneficiaries who choose Medicare Advantage enroll in a plan offered by an insurer such as UnitedHealthcare, Humana, CVS/Aetna, or Centene rather than receiving coverage directly from the federal government. Medicare Advantage plans receive monthly capitation payments from CMS for each enrolled member — the payment amount is risk-adjusted using the CMS-HCC model based on each member's demographic characteristics and documented chronic conditions.
Plans must cover all Original Medicare benefits and may offer supplemental benefits such as dental, vision, hearing, and fitness programs. Medicare Advantage is the fastest-growing segment of the US healthcare market, covering more than 33 million beneficiaries as of 2025 — over half of all Medicare-eligible Americans. The financial stakes of MA data quality are enormous: a single RAF score point difference across a plan's membership can represent millions of dollars in capitation revenue annually.
CMS audits MA plans through Risk Adjustment Data Validation (RADV) audits, which review medical records to verify that submitted HCC diagnoses are supported by clinical documentation from face-to-face encounters with eligible provider types. Plans with high error rates face recoupment of overpaid capitation amounts, making accurate risk adjustment data pipelines a direct revenue integrity concern. Healthcare data engineers working with Medicare Advantage data build and maintain the complete risk adjustment data lifecycle: claim ingestion from provider encounters, ICD-10 to HCC mapping using the CMS crosswalk, RAF score calculation using the CMS-HCC V28 model coefficients, encounter data submission to CMS through the Encounter Data Processing System (EDPS), and RADV audit support pipelines that retrieve supporting medical records.
Key MA-specific data elements include the CMS contract ID (H-number), the plan benefit package (PBP) identifier, the risk adjustment processing system (RAPS) submission identifier, and the dual eligibility code that affects both capitation rates and member cost-sharing. Stars ratings, which depend heavily on HEDIS quality measure performance, are also a primary focus for MA data engineering teams because they determine quality bonus payments from CMS.
Standard Abbreviation
ma
Category
Production DDL — DIM_MEMBER
CREATE OR REPLACE TABLE DIM_MEMBER (
mbr_key INTEGER NOT NULL -- surrogate key,
mbr_id VARCHAR(50) NOT NULL -- member identifier,
mbr_first_nm VARCHAR(100) -- first name,
mbr_last_nm VARCHAR(100) -- last name,
mbr_birth_dt DATE -- date of birth,
mbr_gndr_cd CHAR(1) -- gender code M/F/U,
mbr_age SMALLINT -- age in years,
mbr_state_cd CHAR(2) -- state code,
mbr_zip_cd VARCHAR(10) -- zip code,
mbr_elig_ind BOOLEAN -- eligibility indicator,
mbr_enrl_dt DATE -- enrollment date,
mbr_term_dt DATE -- termination date,
mbr_plan_cd VARCHAR(20) -- plan code,
mbr_dual_elig_cd VARCHAR(10) -- dual eligibility code,
load_dt TIMESTAMP_NTZ NOT NULL -- load timestamp
);
Standard Snowflake DDL for the canonical member table. Convert to BigQuery or Databricks →
Why This Term Matters
Member and enrollment data governs who receives care and who pays for it — making it foundational to every downstream healthcare analytics workflow. Data engineers who understand member terminology build eligibility pipelines that prevent coverage gaps, correctly identify dual-eligible members, and support accurate risk adjustment submissions to CMS. Enrollment errors directly affect capitation payments and can trigger CMS corrective action plans.
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