Back to search

member low income subsidy

mbr_lis
member·Updated Jun 23, 2026

Definition

ISO-11179 Definition

The Medicare Part D Low Income Subsidy program status for a health plan member, indicating eligibility for federal assistance reducing prescription drug premiums, deductibles, and cost sharing. Also known as Extra Help, the Low Income Subsidy is available to Medicare beneficiaries with limited income and resources. CMS assigns LIS levels including full subsidy and partial subsidy based on income and asset thresholds.

LIS status affects pharmacy benefit cost sharing calculations, annual enrollment period rules, and risk adjustment coefficients. Healthcare data teams use mbr_lis in pharmacy benefit management systems to apply correct cost sharing at point of sale, in risk adjustment models, and in health equity analytics targeting medication adherence programs for low-income members.

Standard Abbreviation

mbr_lis

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.

Related Content

Looking for more healthcare terms?

Browse our complete library of 100,000+ standardized healthcare data terms

Browse All Terms