Medicare Monthly Enrollment

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 includes enrollee counts on a rolling 12 month basis and also provides information on yearly trends.

Data and Resources

Field Value
accessLevel public
accrualPeriodicity R/P1M
bureauCode {009:38}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://healthdata.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
dataQuality true
describedBy https://data.cms.gov/resources/medicare-monthly-enrollment-data-dictionary
identifier https://data.cms.gov/data-api/v1/dataset/d7fabe1e-d19b-4333-9eff-e80e0643f2fd/data-viewer
issued 2021-12-22
landingPage https://data.cms.gov/summary-statistics-on-beneficiary-enrollment/medicare-and-medicaid-reports/medicare-monthly-enrollment
language {en-US}
license https://www.usa.gov/government-works
modified 2022-07-28
programCode {009:000}
publisher Centers for Medicare & Medicaid Services
references {https://data.cms.gov/resources/medicare-and-medicaid-reports-methodology}
resource-type Dataset
source_datajson_identifier true
source_hash 1b9333840a2f0eab9d1b8e5ec07b9079e8d71e68
source_schema_version 1.1
temporal 2022-03-01/2022-04-30
theme {Medicare}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • beneficiary-enrollment
  • ckan
  • counties
  • geo
  • geoss
  • health-equity
  • medicare
  • medicare-advantage
  • medicare-prescription-drug
  • national
  • north-america
  • original-medicare
  • states-territories
  • united-states
isopen False
license_id other-license-specified
license_title other-license-specified
maintainer CMS Program Statistics - OEDA
maintainer_email IPAG_Data_Products@cms.hhs.gov
metadata_created 2025-11-22T15:45:47.037846
metadata_modified 2025-11-22T15:45:47.037850
notes 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 includes enrollee counts on a rolling 12 month basis and also provides information on yearly trends.
num_resources 5
num_tags 16
title Medicare Monthly Enrollment