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   What is the chronic condition data warehouse (CCW)?

   • The Chronic Condition Data Warehouse (CCW) is provided with funding from the Centers for Medicare & Medicaid Services (CMS) for use by CMS approved research projects (including pilots), healthcare reform projects, interagency agreement projects, and/or CMS staff.

   CCW Sign In

   federate.ccwdata.org/public/share/main/signin.html

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   What data is used in the chronic condition reports?

   • The data used in the chronic condition reports are based upon CMS administrative enrollment and claims data for Medicare beneficiaries enrolled in the fee-for-service program. These data are available from the CMS Chronic Condition Data Warehouse (CCW), a database with 100% of Medicare enrollment and fee-for-service claims data1.

   Chronic Conditions among Medicare Beneficiaries

   data.cms.gov/sites/default/files/2021-01/Medicare Chronic Conditions Methodology 2020.pdf

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   When is a Medicare beneficiary considered a chronic condition?

   • A Medicare beneficiary is considered to have a chronic condition if the CMS administrative data have a claim indicating that the beneficiary received a service or treatment for the specific condition. Chronic conditions are identified by diagnoses codes on the Medicare claims.

   Chronic Conditions among Medicare Beneficiaries

   data.cms.gov/sites/default/files/2021-01/Medicare Chronic Conditions Methodology 2020.pdf

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   How are chronic conditions identified on Medicare claims?

   • Chronic conditions are identified by diagnoses codes on the Medicare claims. On October 1, 2015 the conversion from the 9th version of the International Classification of Diseases (ICD-9-CM) to version 10 (ICD-10-CM) occurred. Regardless of when a claim was submitted for payment, services that occurred prior to October 1, 2015, use ICD-9 codes.

   Chronic Conditions among Medicare Beneficiaries

   data.cms.gov/sites/default/files/2021-01/Medicare Chronic Conditions Methodology 2020.pdf

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2. www2.ccwdata.orgHome - Chronic Conditions Data Warehouse

   www2.ccwdata.org

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   The Chronic Conditions Data Warehouse (CCW) is a research database designed to make Medicare, Medicaid, Assessments, Part C, 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.

   • Medicare Data

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   • Medicaid Data

     Chronic Conditions Data Warehouse Medicaid Data Centers for...

   • Condition Categories

     Explore the Chronic Conditions Data Warehouse, a research...

   • Analytic Guidance

     Analytic Guidance - Home - Chronic Conditions Data Warehouse

   • Pricing

     Create estimated cohort sizes using demographic, enrollment,...

   • Medicare Tables & Reports

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   • User Documentation

     The following user guides provide information that may be...

   • Chronic Conditions Data Warehouse

     The CCW is designed to: Follow beneficiaries across multiple...

   • CCW Sign In

     The Chronic Condition Data Warehouse (CCW) is provided with...

3. data.cms.gov › sites › defaultChronic Conditions among Medicare Beneficiaries

   data.cms.gov › sites › default

   Detailed information on the identification of these conditions is available at the Chronic Condition Warehouse (www.ccwdata.org). To classify MCC for each Medicare beneficiary, these conditions are counted and grouped into four categories (0-1, 2-3, 4-5 and 6 or more).

4. www.cms.gov › data-research › researchData Tools for Researchers | CMS

   www.cms.gov › data-research › research

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   Sep 6, 2023 · Chronic Condition Data Warehouse (CCW) Condition Flags (CCW Condition Flags) CMS' database of multiple chronic condition indicators or variables (i.e., "flags") on all beneficiaries in the Medicare, Medicaid and Medicare-Medicaid dually enrolled populations; All flags are available for calendar years 2000 through 2012

5. www.cms.gov › Research-Statistics-Data-and-SystemsCHRONIC CONDITIONS - Centers for Medicare & Medicaid Services

   www.cms.gov › Research-Statistics-Data-and-Systems

   We selected 15 common chronic conditions that are available in the CMS Chronic Condition Warehouse (CCW) research files that also correspond with the list of chronic conditions used to define multiple chronic conditions by the Department of Health and Human Services Strategic Framework on Multiple Chronic Conditions2.