CMS Chronic Conditions derived from CMS
Centers for Medicare and Medicaid Services (CMS)
Purpose
In 2017 and 2018, Centers for Medicare and Medicaid Services (CMS) data was obtained for years of coverage from 2008 to 2015. This extended-follow-up data includes details of claims submitted to Medicare for reimbursement, including doctor visits, hospital stays, and filled prescriptions.
Population
CMS data was obtained for 49,048 active participants who were alive and consented to Medicare/Medicaid data collection in 2013 while completing the MUQ. Note, at the time the MUQ was administered participants from the Alabama center had not yet had the opportunity to agree to participate in extended-follow-up and thus have no MUQ or CMS data.
Data Collected
CMS claims (Medicare Part A/B) are divided by source of the claim, into Inpatient (care received while undergoing a stay at a hospital), Outpatient (care received at a hospital by people not admitted as an inpatient), Carrier (care provided by other specific physicians/suppliers), and MedPAR (a combination of inpatient and skilled nursing facility stays).
CMS drugs (Medicare Part D) are provided one per drug event, which includes the initial prescription and any refills dispensed. Each event record includes information from the prescription label, such as brand name, generic name, national drug code, strength, dosage, quantity, and date dispensed.
Master Beneficiary Summary File (MBSF) contains summary information for each participant, including details of Medicare eligibility and coverage Base Segment (A/B/C/D), as well as assessments for several common cancers and chronic conditions. Chronic Conditions Segments.
Chronic Conditions Data Available
The Chronic Conditions are defined by the Chronic Condition Data Warehouse (CCW) using disease specific algorithms. A PLCO CMS Chronic Conditions analysis file has been generated from the MBSF data and includes analysis ready variables for the 22 non-cancer chronic conditions. This analysis file contains a flag, number of days since randomization and year variable for each condition. The file also contains a calculated start and end of coverage.
The Chronic Conditions data dictionary can be viewed at CMS Chronic Conditions dataset. Counts of the conditions by various questionnaires can be found at Data Tables and by biospecimens at Biospecimen Tables.
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