Data & research

Learn about the data, systems, and research behind the programs that provide health coverage to more than 100 million people.

Popular for students and researchers

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Data.CMS.gov

Access data about CMS programs

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Data.Medicaid.gov

Access data about Medicaid and CHIP

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Provider Data Catalog

Access data about Medicare Providers

Explore catalog

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ResDAC

Learn about CMS data for research and request Research Identifiable Files (RIFs)

Data & Research Topics

Data & Research Topics

CMS Data

Learn More About CMS Data

An overview of CMS programs and data. Breakdown of data available by audience type. see more

Types of Data Files

An overview of Public Use Files, Research Identifiable Files, and Limited Data Sets.see more

Data Available to Everyone

Information about Public Use Files (PUFs) and CMS’s open data websites.see more

Data Available to Researchers

Learn more about Limited Data Sets (LDS) and Research Identifiable Files (RIFs).see more

Data Available to CMS Contractors

Learn more about the data CMS contractors can obtain to conduct their contracted work.see more

Data Available to Government Agencies

Information about the pathways Government Agencies can use to request CMS data.see more

Data Available to Qualified Entities

Learn more about Qualified Entity Programs and CMS data available to them.see more

Data Disclosures and Data Use Agreements (DUAs)

Information and training on requesting a Data Use Agreement with CMS.see more

Limited Data Set (LDS) Files

Review a list of available LDS files and their associated feessee more

CMS Data Principles and Operating Norms

Learn more about the shared set of values for data management at CMS.see more

CMS Plan to Enhance Public Access to the Results of CMS-Supported Research

How CMS will take steps to ensure CMS-supported research and data will become more publicly available.see more

CMS information technology

Access to CMS Data & Application

CMS Contractor Data Communications Support Policysee more

CIO Resource Library Overview

This webpage provides an overview of CIO documents, including policies, standards, directives, guidelines, and procedures.see more

Database Administration

CMS Database Administration.see more

CMS' Identity Management

CMS' Identity ManagementCMS' Identity Management (IDM) system is an established, enterprise-wide, identity management solution. IDM is leveraged by CMS business applications across the agency…see more

Enterprise Architecture

CMS Enterprise Architecture Strategy Group. EA definition and HHS workgroups that CMS participates.see more

Enterprise IT Investment Management

The CMS Integrated IT Investment & System Life Cycle Framework can be viewed as a hierarchy.see more

HIPAA Eligibility Transaction System (HETS)

The HIPAA (Health Insurance Portability and Accountability Act) Eligibility Transaction System (HETS) allows you to check Medicare beneficiary eligibility data in real-time. Use HETS to prepare…see more

CMS Information Security and Privacy Overview

"Holding Ourselves to a Higher Standard"What is the Information Security and Privacy Group (ISPG)?The Information Security and Privacy Group (ISPG) is within the CMS Office of Information Technology …see more

Section 508 and CMS

overview of section 508see more

The Strategic Partners Acquisition Readiness Contract (SPARC) is a cost-effective, innovative solution for procuring information technology (IT) professional services from a pool of CMS…see more

Welcome to the Target Life Cycle!TLC OverviewThe TLC is CMS's system development life cycle governance framework that promotes business flexibility and replaces point-in-time gate reviews…see more

Computer data & systems

Electronic Submission of Medical Documentation (esMD)

The Medicare Fee-for-Service (FFS) Compliance programs prevent, reduce, and measure improper payments through medical review. We provide a number of programs to educate and support Medicare…see more

Medicaid Data Sources - General Information

Medicaid Data Sources - General Informationsee more

Electronic Medical Documentation Interoperability (EMDI) Program The Centers for Medicare & Medicaid Services (CMS) Electronic Medical Documentation Interoperability (EMDI) Initiative…see more

Medicaid Information Technology Architecture (MITA)

The Medicaid Information Technology Architecture (MITA) pages are currently being migrated to the Medicaid.gov website. In the interim, please use the following links from the CMS.gov Archive…see more

Minimum Data Set 3.0 Public Reports

Minimum Data Set 3.0 Public Reportssee more

Transformed Medicaid Statistical Information System

Monitoring programs

Improper Payments Measurement Programs

Background The Payment Integrity Information Act of 2019 (PIIA) (Public Law No. 116-117) requires government agencies to identify, report, and reduce improper payments in the government's programs…see more

Medicare Fee-for-Service Compliance Programs

CMS recognizes that it is important for stakeholders to understand how CMS anticipates performing medical review after the Public Health Emergency (PHE) has ended. Below is an FAQ that addresses how…see more

Medicare Advantage Risk Adjustment Data Validation Program

About the ProgramA CMS Strategic Pillar is to protect the Medicare, Medicaid and Marketplace programs for future generations by serving as a responsible steward of public funds. The Medicare…see more

Medicare Part C and Part D Program Integrity

Medicare Part C and Part D Program Integrity overview.see more

Surveys

Welcome to CMS' Alliance to Modernize Healthcare FFRDC

The "Alliance to Modernize Healthcare" Federally Funded Research and Development Center (Health FFRDC).see more

Consumer Assessment of Healthcare Providers & Systems (CAHPS)

The Centers for Medicare & Medicaid Services (CMS) develop, implement and administer several different patient experience surveys. These surveys ask patients (or in some cases their…see more

Health Outcomes Survey (HOS)

Health Outcomes Survey (HOS)see more

Medicare Current Beneficiary Survey (MCBS)

If you have been contacted to participate in the Medicare Current Beneficiary Survey (MCBS) and would like to verify your selection in this study, please visit our MCBS Respondent Page or contact…see more

Statistics, trends & reports

Comprehensive End Stage Renal Disease (ESRD) Care (CEC) Model Public Use Files

The Comprehensive ESRD Care (CEC) Model was designed to identify, test, and evaluate new ways to improve care for Medicare beneficiaries with End-Stage Renal Disease (ESRD). Through the CEC…see more

Marketplace Products

Marketplace productssee more

Medicare Advantage/Part D Contract and Enrollment Data

Important Notice: CMS reloaded the January 2025 files on February 27, 2025. The correct data files should be dated 1/21/2025 or later.The Medicare Advantage (MA) / Part D Contract and Enrollment Data…see more

NCH and MEDPAR Data Dictionary

NCH and MEDPAR Data Dictionarysee more

Next Generation ACO Model (NGACO) Public Use Files

The Next Generation ACO Model is an initiative for ACOs that are experienced in coordinating care for populations of patients. The goal of the Model is to test whether strong financial incentives for…see more

Part B Carrier Summary Data File

Part B Carrier Summary Data Filesee more

Trustees Report & Trust Funds

Annual Reports of the Boards of Trustees of the Medicare Trust Fundssee more

Chief Financial Officer (CFO) Report

CFO Reportsee more

CMS Statistics Reference Booklet

The CMS Statistics reference booklet provides quick summary information about enrollment and expenditures within the Medicare and Medicaid programs. The reference booklets are available for…see more

HCRIS Data DisclaimerThe Centers for Medicare & Medicaid Services (CMS) has made a reasonable effort to ensure that the provided data/records/reports are up-to-date, accurate, complete, and…see more

EDI Performance Statistics

Statistical information and reports related to Medicare's implementation of HIPsee more

Health Plans, Reports, Files and Data

Overview page for 8 Medicare Advantage files which contain enrollment and eligible countssee more

Health Care Information System (HCIS) Data File

Health Care Information System (HCIS) Data Filesee more

Medicare and Medicaid Insight Briefssee more

MCBS Public Use File

MCBS Public Use Files (PUFs)The Medicare Current Beneficiary Survey (MCBS), sponsored by the Centers for Medicare & Medicaid Services Office of Enterprise Data and Analytics (OEDA) through a…see more

Medicare Claims Synthetic Public Use Files (SynPUFs)

Medicare Claims Synthetic Public Use Files (PUFs)see more

Medicare Fee for Service for Parts A & B

Medicare Fee for Service for Parts A & Bsee more

Medicare Program Rates & Statistics

Medicare, Medicaid, health care rates and statisticssee more

National Health Expenditure Data

National Health Expenditures home pagesee more

Part B National Summary Data File (Previously known as BESS)

Part B National Summary Data File - previously known as BESSsee more

Provider Statistical & Reimbursement Report

Explanation of Provider Statistical & Reimbursement System, including links to manuals and instructionssee more

Report on Conferences Sponsored by CMS

Report On Conferences Sponsored By CMSsee more

Medicare Enrollment Reports

Medicare Enrollment Tables: National, State & Countysee more

CMS COVID-19 Data Products

On January 31, 2020, the U.S. Department of Health and Human Services Secretary declared a public health emergencysee more

Actuarial Studies

Actuarial Studiessee more

Data & Statistical Resources

The CMS Medicare-Medicaid Coordination Office (MMCO) has brought together reports, data, and other resources to help you better understand the health, health care needs, and health care experiences…see more

Archives

Active Projects Report

Active Project Reportsee more

Data Compendium

This page serves as an archive of the CMS Data Compendium which was published in 2002 and 2003 as well as from 2006 through 2011. The CMS Data Compendium provides key statistics about CMS programs…see more

Health Care Financing Review

This page serves as an archive of the Centers for Medicare & Medicaid Services’ (CMS) Health Care Financing Review (HCFR) journal. The HCFR was released from 1979 and 2009 with the goal of presenting…see more

List of Past Articles

HCFR archivesee more

Medicare & Medicaid Research Review (MMRR)

This page serves as an archive of the Medicare & Medicaid Research Review (MMRR). Between 2011 and 2014, the MMRR published articles and briefs that examined and evaluated health care coverage,…see more

Medicare & Medicaid Statistical Supplement

This page serves as an archive for the Medicare & Medicaid Statistical Supplement which was published annually from 2001 to 2013. The Medicare & Medicaid Statistical Supplement provides…see more

Research Reports

Research Reports Listsee more

Chart Series overviewsee more

Basic Stand Alone (BSA) Medicare Claims Public Use Files (PUFs)

CMS is committed to increasing access to its Medicare claims data through the release of de-identified data files available for public use. These files are available to researchers as free…see more

Find data that has moved

We've moved some of our data pages to CMS Open Data sites. Explore the directory to find content that has moved.

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