CCW

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The CMS Chronic Condition Data Warehouse (CCW) provides researchers with Medicare and Medicaid beneficiary, claims, and assessment data linked by beneficiary across the continuum of care.  The files also use ICD-9 codes and other information to identify the chronic condition each beneficiary has.  The question is, how well does the CCW identify these chronic conditions?

According to Gorina and Kramarow (2011) the results are mixed.  The authors examine the strengths and limitations of using CMS’s CCW algorithm with Medicare claims data to identify chronic conditions in older persons.  Their methodology is as follows:

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