Denominator (DN) Files

Medicare

Description

Our Denominator (DN) files have the following data on individuals enrolled in Medicare between 1991 and 1998:

beneficiary demographics;
eligibility status; and
plan enrollment.

For 1999 - 2021 data, refer to the Master Beneficiary Summary File (MBSF) - Base Segment File page.

Variables Summary

The table below lists variable categories for and some key variables in Denominator (DN) data. For a full list of variables, review the DN data dictionary.

Demographics

Age, Beneficiary Identification Number, Date of Birth, Date of Death, Gender, Race, Residence County Code, Residence State, Residence Zip Code

Eligibility & Enrollment

Monthly Enrollment Counts (A/B/Both), Monthly Managed Care Indicator (Yes/No), Reasons for Entitlement, State Buy-In Indicators

Years Available

1991 - 1998

File Update Frequency

Annual

Data Dictionary Link

Visit the Data Documentation Page

NIA Data Partners Offering DN

HABC, HRS, LLFS, NLTCS, NSHAP, PSAD, PSID, RADC, WLS

NIA Data Partners Not Offering DN

BLSA, CE, NHAS, NHATS, PT, UAS, UFOVT

Additional Resources

Master Beneficiary Summary File (MBSF) - Base Segment Files