The CMS Virtual Research Data Center (VRDC) is an alternative solution for accessing and analyzing CMS data for research purposes. To learn more about getting data for your research, refer to the Requesting VRDC Access information, view the CMS VRDC FAQs and visit the ResDAC website.
Medicare Risk Score Research Identifiable Files (RIFs) for Payment Year 2014 (PY14) are now available. See the Record Layout and User Guide for file details. Risk scores are used to adjust payments to Medicare Advantage plans to account for differences in relative costs among plan enrollees.
Medicare Advantage (Part C) Encounter Data Research Identifiable Files (RIFs) for Year 2015 are now available; see Record Layout & User Guide. These preliminary files are created from data submitted to CMS by Medicare Advantage Organizations (MAOs) that provide services to beneficiaries under Medicare Part C. The preliminary version created in May 2017 includes accepted encounters submitted through that date. Final versions will be created late 2018 after submission window closes.
National Death Index Data: NDI Cause of Death Information from 1999-2016 for Medicare beneficiaries and 1999-2013 for Medicaid recipients is now available. See the Record Layout and Codebook for more details.
CMS receives numerous requests for data which are used to develop aggregated statistics, charts and graphs. The CCW's Medicare Web Tables have been updated and are now available with data for years 2008 - 2017. Web Charts for the same years are coming soon!
As a research database, CCW users are generally expected to pay fees to access and use data. Costs vary depending on beneficiary cohort size, years of data and files ordered. In preparation for submitting a data request, a cost estimation tool allows users to create an estimated cohort size and determine an estimated cost before moving to the next level in the data request process.
View the Chronic Conditions Data Warehouse informational video to learn how you can… Access… Analyze… and Aggregate… All the data you need… Like never before.
Welcome to the Chronic Conditions Data Warehouse
The CMS Chronic Conditions Data Warehouse (CCW) provides researchers with Medicare and Medicaid beneficiary, claims, and assessment data linked by beneficiary across the continuum of care. In the past, researchers analyzing data files were required to perform extensive analysis related to beneficiary matching, deduplication, and merging of the files in preparation for their study analysis. With the CCW data, this preliminary linkage work is already accomplished and delivered as part of the data files sent to researchers.
The Chronic Conditions Data Warehouse (CCW) is a research database designed to make Medicare, Medicaid, Assessments, and Part D Prescription Drug Event data more readily available to support research designed to improve the quality of care and reduce costs and utilization.
About CCW
Data Availability
The Beneficiary Link
Requesting VRDC Access
How to Request Data
News & Events
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