The CCW data files were designed to facilitate research across the continuum of care, using data files that could be easily merged and analyzed by beneficiary. Each beneficiary in the CCW is assigned a unique, unidentifiable link key, which allows researchers to easily merge data files and perform relevant analyses across different claim types, enrollment files, Part D event data, assessment data, and other CCW file types. CCW data files are available upon request from CMS. While the file record layouts provided below are the standard file record layouts for all CCW data requests, data may be requested for a variety of cohorts (e.g., specific to a research study design, national 5% sample, specific state or other demographic, etc.).

The CCW claims data files have been streamlined to include only those variables determined by CMS to be of value and useful for research or analytic purposes. The data files delivered from the CCW contain a subset of the original source files. Variables used infrequently or not applicable to a particular setting have been removed. The file record layouts listed below provide variable descriptions, variable format, and length for those variables included in the CCW data files. For additional information regarding data file availability, please refer to the Research Identifiable File Availability.

Medicare Claims

Medicare Fee-For-Service Claims

1999-2019

Record Layout

Codebook

Medicare Encounter Records

2015-2019

Record Layout

Codebook

MedPAR Data Dictionary

1999-2019

Record Layout

Codebook

Medicare Enrollment

Master Beneficiary Summary - Base (A/B/C/D)

2006-2019

Record Layout

Codebook

Master Beneficiary Summary - Base (A/B/D)

1999-2005

Record Layout

Codebook

Master Beneficiary Summary - National Death Index

1999-2016

Record Layout

Codebook

Master Beneficiary Summary - Chronic Conditions

1999-2019

Record Layout

Codebook

Master Beneficiary Summary - Other Chronic or Potentially Disabling Conditions

2000-2019

Record Layout

Codebook

Master Beneficiary Summary - Cost and Use

1999-2019

Record Layout

Codebook

Plan Characteristics File  (formerly titled Part D Plan Characteristics)

2015-2019

Record Layout

Codebook

Medicare Risk Score Files

2014

Record Layout

Codebook

Medicare Part D

Part D Event / Drug Characteristics Files

2006-2019

Record Layout

Codebook

Part D Plan Characteristics Files

2007-2014

Record Layout

Codebook

Part D Plan Characteristics Files

2006

Record Layout

 

Part D Pharmacy Characteristics Files

2006-2019

Record Layout

Codebook

Part D Prescriber Characteristics Files

2006-2019

Record Layout

Codebook

Part D Formulary Files

2010-2019

Record Layout

Codebook

Part D Medication Therapy Management Files

2013-2019

Record Layout

Codebook

Part D Plan Election Type Beneficiary Summary Files

2007-2019

Record Layout

Codebook

Accountable Care Organizations (ACOs) and Other Innovation Center Initiatives

Pioneer

2012-2014

Record Layout

Codebook

Shared Savings Program (SSP) - Beneficiary File

2013-2020
and 2021 Initial, Q1 and Q2

Record Layout

 

Shared Savings Program (SSP) - Provider File

2013-2019,
2020-2021 Initial

Record Layout

 

Next Generation ACO - Beneficiary and Provider File - Beneficiary and Provider File

2016-2018

Record Layout

 

Comprehensive End Stage Renal Disease Care Model - Beneficiary and Provider File

Q4 2015-2017

Record Layout

 

Assessment

IRF-PAI

1999-2019

Record Layout

 

MDS 3.0

October 2010-2019

Record Layout

 

Swing Bed 3.0

October 2010-2019

Record Layout

 

OASIS

1999-2019

Record Layout

 

SPADE

2018

Record Layout

 

MDS 2.0

1999-Sept. 2010

Record Layout

 

Swing Bed 2.0

1999-Sept. 2010

Record Layout

 

Medicaid

T-MSIS Analytic File (TAF) Demographic and Eligibility

2014-2019

Record Layout

Codebook

T-MSIS Analytic File (TAF) Claims

2014-2019

Record Layout

Codebook

T-MSIS Analytic File (TAF) Annual Plan

2014-2019

Record Layout

Codebook

T-MSIS Analytic File (TAF) Annual Provider

2014-2019

Record Layout

Codebook

Medicaid Analytic eXtract (MAX) - CCW

1999-2015

Record Layout

 

Medicaid Enrollee Supplemental File (MESF)

1999-2013

Record Layout

 

Useful Medicaid Analytic eXtract (MAX) Data Validation Tables, Data Anomalies Reports, and other data documentation about file content by state and year are also available for review on the Centers for Medicare & Medicaid Services (CMS) website.

Medicare-Medicaid Linked Enrollee Analytic Data Source (MMLEADS)

MMLEADS

2016

Record Layout

Codebook

MMLEADS

2006-2012

Record Layout

 

The MMLEADS Public Use File (PUF) is available on the CMS website.

Other Data Files

Medicare Data on Provider Practice and Specialty (MD-PPAS)

2008-2019

CMS Data Layout