Research, Statistics, Data & Systems

Data & research

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

CMS COVID-19 Data Products

Medicare COVID-19 Hospitalization Trends
Medicare COVID-19 Hospitalization Trends Report What is the Medicare COVID-19 Hospitalization Trends Report? Our Medicare COVID-19 Hospitalization Trends Report gives you aggregate…see more
Preliminary Medicare COVID-19 Data Snapshot
Preliminary Medicare COVID-19 Data Snapshot What is the Medicare COVID-19 Snapshot? Our Medicare COVID-19 Data Snapshot fact sheet (PDF) reports COVID-19 cases and hospitalizations…see more
Medicare COVID-19 Nursing Home Analysis
Medicare COVID-19 Nursing Home Analysis The Impact of COVID-19 on Medicare Beneficiaries in Nursing Homes Analysis presents preliminary information on the impact of COVID-19 on Medicare…see more
Medicare COVID-19 Vaccine Analysis
Medicare COVID-19 Vaccine Analysis In December of 2020, the first COVID-19 vaccine received emergency use authorization (EUA).  Following the EUA, CMS began to assess the feasibility of…see more
Medicare Current Beneficiary Survey Fall 2020 COVID-19 Data Snapshot
Medicare Current Beneficiary Survey Fall 2020 COVID-19 Data Snapshot What is the Medicare Current Beneficiary Survey Fall 2020 COVID-19 Data Snapshot? Our MCBS Fall 2020 COVID-19…see more
Medicare Current Beneficiary Survey Summer 2020 COVID-19 Data Snapshot
Medicare Current Beneficiary Survey Summer COVID-19 Data Snapshot What is the Medicare Current Beneficiary Survey Summer 2020 COVID-19 Data Snapshot? Our MCBS Summer 2020 COVID…see more
Medicare Current Beneficiary Survey Winter 2021 COVID-19 Data Snapshot
Medicare Current Beneficiary Survey Winter 2021 COVID-19 Data Snapshot What is the Medicare Current Beneficiary Survey Winter 2021 COVID-19 Data Snapshot? Our MCBS Winter 2021&nbsp…see more
COVID-19 Nursing Home Data
COVID-19 Public Health Emergency Flexibilities and Returning to Regular Operations
Unwinding Reporting
MCBS Public Use File
MCBS Public Use FileThe Medicare Current Beneficiary Survey (MCBS), sponsored by the Centers for Medicare & Medicaid Services Office of Enterprise Data and Analytics (OEDA) through a contract…see more

CMS information technology

Access to CMS Data & Application
CMS Contractor Data Communications Support Policysee more
Data Architecture & Engineering
Data Administration's Data Architecture & Engineering Overview Page.see more
Blue Button® 2.0: Improving Medicare Beneficiary Access to Their Health Information
Developers interested in connecting applications to the Blue Button 2.0 API should visit the developer site. For more information about Blue Button services for Medicare beneficiaries, please…see 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 Management CMS' Identity Management (IDM) system is an established, enterprise-wide, identity management solution. IDM is leveraged by CMS business…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 (ILC) can be viewed as a hierarchysee 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
SPARC Home
  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
TLC Overview
  Welcome to the Target Life Cycle! TLC Overview The TLC is CMS's system development life cycle governance framework that promotes business flexibility and replaces point-in-time…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
EMDI Overview
Electronic Medical Documentation Interoperability (EMDI) Program The Centers for Medicare & Medicaid Services (CMS) Electronic Medical Documentation Interoperability (EMDI) Initiative…see more
IRIS Software Programs
General Two IRIS software programs are available for teaching hospital and provider community use.  They are IRISV3 and IRISEDV3.  These programs are used by teaching hospitals and provider…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
Medicaid Statistical Information Statistics (MSIS)
Prior to Federal fiscal year 1999, the Medical Statistical Information System (MSIS) was a voluntary program and those states participating in the MSIS project provided data tapes from their claims…see more
MDS 2.0 Public Quality Indicator and Resident Reports
MDS 2.0 Reportssee more
MDS 2.0 Software Specifications
software specificationssee more
Minimum Data Sets 2.0 Tool and Public Reports
"see more
Minimum Data Set 3.0 Public Reports
Minimum Data Set 3.0 Public Reportssee more
Transformed Medicaid Statistical Information System

Files for order

Data Disclosures and Data Use Agreements (DUAs)
Centers for Medicare & Medicaid Services (CMS) Data Use Agreementssee more
Files for Order - General Information
The Centers for Medicare & Medicaid Services (CMS) makes certain data files available for order. These data files include information collected through the operation of the Medicare and…see more
Identifiable Data Files
Identifiable data files overviewsee more
Limited Data Set (LDS) Files
The Centers for Medicare & Medicaid Services (CMS) makes Limited Data Set (LDS) files available to researchers as allowed by federal laws and regulations as well as CMS policy. LDS files contain…see more

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…see more
Medicare Advantage Risk Adjustment Data Validation Program
About the Program Protecting our programs' sustainability for future generations by serving as a responsible steward of public funds is a CMS Strategic pillar. The Medicare Advantage Risk…see more
Medicare Part C and Part D Program Integrity
Medicare Part C and Part D Program Integrity overview.see more
Parts C and D Recovery Audit Program
About the Program The Medicare Parts C and D Recovery Audit Program was created to identify and correct past improper payments to Medicare providers and implement procedures to help…see more
Qualified Entity Program
Qualified Entity Programsee more

Research

Actuarial Studies
Actuarial Studiessee more
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)
This is the HOS page.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 contact NORC toll free at 1-844-777-2151. If…see more
Research - General Information
Research - General Informationsee more
Data & Statistical Resources
SPOTLIGHT & RELEASES11/08/2023: (MMCO Statistical & Analytic Reports page)CMS released a revised resource, "Quarterly Enrollment Snapshot (06/2015-12/2022)".10/17/2023: …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
The Medicare Advantage (MA) / Part D Contract and Enrollment Data section serves as a centralized repository for publicly available data on contracts and plans, enrollment numbers, service area 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
Prescription Drug Plan Formulary, Pharmacy Network, and Pricing Information Files for Download
ATTENTION: Beginning in January 2021, these files are available as free downloads. Please note that these are large files and can take time to download. The last two years of files (contract years…see 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
Chronic Conditions Overview
Chronic Conditionssee more
CMS Drug Spending Main
CMS Drug Spending CMS has released several information products that provide greater transparency on spending for drugs in the Medicare and Medicaid programs. These products and associated data…see more
Medicare Provider Utilization and Payment Data
Medicare Provider Charge Datasee 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
Cost Reports
HCRIS Data Disclaimer The 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
Insight Briefs
Medicare and Medicaid Insight Briefssee more
MCBS Public Use File
MCBS Public Use FileThe Medicare Current Beneficiary Survey (MCBS), sponsored by the Centers for Medicare & Medicaid Services Office of Enterprise Data and Analytics (OEDA) through a contract…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 Beneficiaries at a Glance
Medicare Beneficiaries at a Glance see more
Medicare Geographic Variation
Federal policymakers and health researchers have long recognized that the amount and quality of the health care services that Medicare beneficiaries receive vary substantially across different…see more
Hospital Cost Report Public Use File
The Hospital Cost Report Public Use File (Hospital Cost Report PUF) presents select measures provided by hospitals through their annual cost report, and is organized at the hospital level. …see more
Medicare Enrollment Reports
Medicare Enrollment Tables: National, State & Countysee more
CMS Fast Facts
CMS has developed a new quick reference statistical summary on annual CMS program and financial data.  CMS Fast Facts includes summary information on total program enrollment, utilization,…see more
CMS Program Statistics
Medicare Provider Cost Report Public Use Files

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
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

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COVID-19

Analyze transparent data on the impacts of COVID-19.

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People with Medicare

Understand Medicare beneficiaries through data.

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