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Data

The DAC holds CMS Medicare Fee-For-Service (FFS) claims data-sets starting in 1985.  In the earlier years, only 20% Denominator and MedPar files (1985-1991) and 5% Carrier (1986-1997) were available. Over time, sample sizes increased and file types expanded. By 2006, the DAC acquired approval from CMS to use 100% Medicare FFS claims data-sets.

The DAC holds CMS Medicaid, ACO, Survey, and several Non-CMS data-sets used in conjunction with CMS data.

The DAC obtains ICD-9/ICD-10 diagnosis & procedure codes, CPT/HCPCs procedures codes, DRGs, and Revenue Codes that are used to define patient condition cohorts and understand their outcomes. These codes are also used to build measures often used in statistical modeling. The DAC creates an annual publication of coding trends, which represents the number of beneficiaries and events for each code type in the CMS data.

The only acceptable process for moving data on or off the DAC Information Systems is through a data transfer request submission. Only DAC Tier 1 personnel are authorized to move any data-sets on or off the DAC IS. 

Data, Codes, and Measures


Data Security and Compliance