The Centers for Medicare & Medicaid Services (CMS) makes Limited Data Set (LDS) files available to researchers as allowed by federal laws and regulations as well as CMS policy. LDS files contain beneficiary-level health information and are considered identifiable files, but they do not contain specific direct identifiers as defined in the Health Insurance Portability and Accountability Act (HIPAA) Privacy Rule (HIPAA Privacy Rule).
For detailed information on each of the LDS files that CMS allows researchers to request, please use the navigation menu on the left.
To request LDS files, please follow the instructions on the Limited Data Set Files Data Use Agreements page.
To view information on the estimated timeline for updates to LDS file availability, please select the drop-down option below.
- Limited Data Set (LDS) File Update Schedule
Estimated Release Timeline
LDS Rule-Making Files
MEDPAR - Hospital (National)
Long-Term Care Hospital (LTCH) PPS Expanded Modified MEDPAR
Skilled Nursing Facility (SNF) MEDPAR
End Stage Renal Disease Prospective Payment System (ESRD PPS)
Hospital Outpatient Prospective Payment System (OPPS)
Hospital Outpatient Prospective Payment System (OPPS) Partial Hospitalization Program (PHP)
Ambulatory Surgical Center (ASC) Payment System
Home Health Prospective Payment System (HH PPS)
Inpatient Psychiatric Prospective Payment System (IPF PPS)
Available once the associated rule (proposed or final) has been posted to the Federal Register
Other LDS Files
Annual Master Beneficiary Summary File (MBSF) and Standard Analytic Files (Medicare Claims)
Quarterly MBSF and Standard Analytic Files
Medicare Current Beneficiary Survey (MCBS)
Survey File: August
Cost Supplement: November
Enrollee-Level External Data Gathering Environment (EDGE)
Medicaid State Drug Utilization
Physician/Supplier Procedure Summary (PSPS)
NOTE: The estimated release timeline is based on historical file releases and is subject to change.