data.cms.govHand-written summary

Medicare Monthly Enrollment

Monthly counts of people with Medicare by national, state and county level, split into Original Medicare versus Medicare Advantage, and stand alone drug plans versus Medicare Advantage drug plans.

Official page on data.cms.gov Download CSV Data dictionary

Last posted: Oct 22, 2026
Period covered: Jul 1, 2026 to Jul 31, 2026
Update frequency: Monthly

Dates as CMS lists them in its catalog.

Before you use it

One file mixes national, state and county rows. Filter on the geographic level column before you add anything up.

Columns 60

Column	What it means	Type
YEAR`YEAR`		string
MONTH`MONTH`		string
BENE_GEO_LVL`BENE_GEO_LVL`		string
BENE_STATE_ABRVTN`BENE_STATE_ABRVTN`		string
BENE_STATE_DESC`BENE_STATE_DESC`		string
BENE_COUNTY_DESC`BENE_COUNTY_DESC`		string
BENE_FIPS_CD`BENE_FIPS_CD`		string
TOT_BENES`TOT_BENES`		number
ORGNL_MDCR_BENES`ORGNL_MDCR_BENES`		number
MA_AND_OTH_BENES`MA_AND_OTH_BENES`		number
AGED_TOT_BENES`AGED_TOT_BENES`		number
AGED_ESRD_BENES`AGED_ESRD_BENES`		number
AGED_NO_ESRD_BENES`AGED_NO_ESRD_BENES`		number
DSBLD_TOT_BENES`DSBLD_TOT_BENES`		number
DSBLD_ESRD_AND_ESRD_ONLY_BENES`DSBLD_ESRD_AND_ESRD_ONLY_BENES`		number
DSBLD_NO_ESRD_BENES`DSBLD_NO_ESRD_BENES`		number
MALE_TOT_BENES`MALE_TOT_BENES`		number
FEMALE_TOT_BENES`FEMALE_TOT_BENES`		number
WHITE_TOT_BENES`WHITE_TOT_BENES`		number
BLACK_TOT_BENES`BLACK_TOT_BENES`		number
API_TOT_BENES`API_TOT_BENES`		number
HSPNC_TOT_BENES`HSPNC_TOT_BENES`		number
NATIND_TOT_BENES`NATIND_TOT_BENES`		number
OTHR_TOT_BENES`OTHR_TOT_BENES`		number
AGE_LT_25_BENES`AGE_LT_25_BENES`		number
AGE_25_TO_44_BENES`AGE_25_TO_44_BENES`		number
AGE_45_TO_64_BENES`AGE_45_TO_64_BENES`		number
AGE_65_TO_69_BENES`AGE_65_TO_69_BENES`		number
AGE_70_TO_74_BENES`AGE_70_TO_74_BENES`		number
AGE_75_TO_79_BENES`AGE_75_TO_79_BENES`		number
AGE_80_TO_84_BENES`AGE_80_TO_84_BENES`		number
AGE_85_TO_89_BENES`AGE_85_TO_89_BENES`		number
AGE_90_TO_94_BENES`AGE_90_TO_94_BENES`		number
AGE_GT_94_BENES`AGE_GT_94_BENES`		number
DUAL_TOT_BENES`DUAL_TOT_BENES`		number
FULL_DUAL_TOT_BENES`FULL_DUAL_TOT_BENES`		number
PART_DUAL_TOT_BENES`PART_DUAL_TOT_BENES`		number
NODUAL_TOT_BENES`NODUAL_TOT_BENES`		number
QMB_ONLY_BENES`QMB_ONLY_BENES`		number
QMB_PLUS_BENES`QMB_PLUS_BENES`		number
SLMB_ONLY_BENES`SLMB_ONLY_BENES`		number
SLMB_PLUS_BENES`SLMB_PLUS_BENES`		number
QDWI_QI_BENES`QDWI_QI_BENES`		number
OTHR_FULL_DUAL_MDCD_BENES`OTHR_FULL_DUAL_MDCD_BENES`		number
A_B_TOT_BENES`A_B_TOT_BENES`		number
A_B_ORGNL_MDCR_BENES`A_B_ORGNL_MDCR_BENES`		number
A_B_MA_AND_OTH_BENES`A_B_MA_AND_OTH_BENES`		number
A_TOT_BENES`A_TOT_BENES`		number
A_ORGNL_MDCR_BENES`A_ORGNL_MDCR_BENES`		number
A_MA_AND_OTH_BENES`A_MA_AND_OTH_BENES`		number
B_TOT_BENES`B_TOT_BENES`		number
B_ORGNL_MDCR_BENES`B_ORGNL_MDCR_BENES`		number
B_MA_AND_OTH_BENES`B_MA_AND_OTH_BENES`		number
PRSCRPTN_DRUG_TOT_BENES`PRSCRPTN_DRUG_TOT_BENES`		number
PRSCRPTN_DRUG_PDP_BENES`PRSCRPTN_DRUG_PDP_BENES`		number
PRSCRPTN_DRUG_MAPD_BENES`PRSCRPTN_DRUG_MAPD_BENES`		number
PRSCRPTN_DRUG_DEEMED_ELIGIBLE_FULL_LIS_BENES`PRSCRPTN_DRUG_DEEMED_ELIGIBLE_FULL_LIS_BENES`		number
PRSCRPTN_DRUG_FULL_LIS_BENES`PRSCRPTN_DRUG_FULL_LIS_BENES`		number
PRSCRPTN_DRUG_PARTIAL_LIS_BENES`PRSCRPTN_DRUG_PARTIAL_LIS_BENES`		number
PRSCRPTN_DRUG_NO_LIS_BENES`PRSCRPTN_DRUG_NO_LIS_BENES`		number

At a glance

Catalog: data.cms.gov
Publisher: Office of Enterprise Data and Analytics (OEDA)
Rows: 587,117
Columns: 60
State column: BENE_STATE_ABRVTN
Topics: Medicare enrollment, Prescription drugs, Medicare Advantage and Part D plans
Contact: IPAG_Data_Products@cms.hhs.gov

API

Free, no key needed. This request returns the first 10 rows as JSON:

https://data.cms.gov/data-api/v1/dataset/d7fabe1e-d19b-4333-9eff-e80e0643f2fd/data?size=10

To keep only one state, filter on the BENE_STATE_ABRVTN column.

CMS's description

The Medicare Monthly Enrollment data provides current monthly information on the number of Medicare beneficiaries with hospital/medical coverage and prescription drug coverage, available for several geographic areas including national, state/territory, and county. The hospital/medical coverage data can be broken down further by health care delivery (Original Medicare versus Medicare Advantage and Other Health Plans) and the prescription drug coverage data can be examined by those enrolled in stand-alone Prescription Drug Plans and those enrolled in Medicare Advantage Prescription Drug plans. The dataset provides monthly and yearly enrollee trends.

Methodology and other documents from CMS:

Medicare Monthly Enrollment Methodology

The summary at the top was written by hand from this description. Record id cms:d7fabe1e-d19b-4333-9eff-e80e0643f2fd. This record as JSON.

Freshness

Before you use it

Columns 60

At a glance

API

CMS's description