Data: Inventory

Review the Medicare and Medicaid data files available across all NIA data partner cohorts. To access details on a specific data file—including the types of variables contained within the file, click the profile link.

NOTE: An NIA data partner may not offer all of the CMS data types and years listed on this page. To determine which CMS data types and years are available for a given data partner, visit the Partners: List page, access the partner's profile, and click the CMS Summary tab.

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File Name

File Summary

Years Available

Profile Link

Denominator (DN)

Demographic, enrollment, and entitlement information for study or survey participants prior to 1999.

1991 - 1998

Access Denominator Profile

Home Health Outcome and Assessment Information Set (OASIS)

Physical and cognitive assessments of study or survey participants who receive home health agency (HHA) care.

1999 - 2020

Access OASIS Profile

Inpatient Rehabilitation Facility (IRF)-Patient Assessment Instrument (PAI)

Physical and cognitive assessments of study or survey participants conducted at an inpatient rehabilitation facility (IRF).

2002 - 2020

Access IRF-PAI Profile

Long-Term Care Minimum Data Set (MDS)

Physical and cognitive assessments of study or survey participants who receive long-term care services.

1999 - 2021

Access the MDS Profile

Master Beneficiary Summary File (MBSF) - Chronic Conditions

Summary file containing indicators of whether study or survey participants have one or more of 27 chronic conditions.

1999 - 2020

Access MBSF - Chronic Conditions Profile

Master Beneficiary Summary File (MBSF) - Cost & Utilization

Summary file containing calculated payments for—and aggregated services rendered to—study or survey participants.

1999 - 2020

Access the MBSF - Cost & Utilization Profile

Master Beneficiary Summary File (MBSF) - Other Chronic Conditions or Potentially Disabling Conditions

Summary file containing indicators of whether study or survey participants have one or more of 35 other chronic or potentially disabling conditions compared to the 27 chronic conditions in the MBSF - Chronic Conditions dataset.

2000 - 2020

Access the MBSF - Other Chronic Conditions Data Profile

Master Beneficiary Summary File (MBSF) - Base Segment

Demographic, enrollment, and entitlement information for study or survey participants from 1999 to 2021.

1999 - 2021

Access the MBSF - Base Profile

Medicaid Analytic Extract (MAX)

Health services information—such as diagnoses, drugs, and procedures—for study or survey participants enrolled in a state Medicaid program between 1999 and 2015.

1999 - 2015

Access the MAX Profile

Medicare Provider Analysis and Review (MedPAR)

Health service information for stays at two Medicare Part A settings—Inpatient and Skilled Nursing Facility.

1991 - 2020

Access the MedPAR Profile

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