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member medicare beneficiary identifier

mbr_mbi_id
member·Updated Jun 23, 2026

Definition

ISO-11179 Definition

The full Medicare Beneficiary Identifier used in CMS administrative systems to uniquely identify Medicare beneficiaries across Part A, Part B, Part C, and Part D enrollment and claims transactions. Introduced in 2018 and fully implemented by January 2020, the Medicare Beneficiary Identifier replaced the Health Insurance Claim Number to eliminate Social Security Numbers from Medicare cards and administrative transactions. The MBI appears on Medicare cards and is required for all Medicare claims submissions and eligibility inquiries.

Healthcare data teams use mbr_mbi_id as the primary key for Medicare beneficiary records, validate format compliance using CMS published validation rules, and maintain crosswalk tables linking MBI to legacy HICN values for historical data reconciliation.

Standard Abbreviation

mbr_mbi_id

Category

member

Production DDL — DIM_MEMBER

DIM_MEMBER.sql
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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