Outcome and Assessment Information Set

Alternate Titles(s): OASIS
UID: 10169


The Outcome and Assessment Information Set (OASIS) is collected by the Centers for Medicare and Medicaid Services, and data is collected from all Medicare and Medicaid certified home care agencies, which comprise approximately 90% of all home care agencies. It is collected as a means to enable the rigorous and systematic measurement of patient home health care outcomes with appropriate adjustment for patient risk factors affecting those outcomes.

OASIS includes data involving the socio-demographic, environmental, support system, health status, and functional status attributes of adult Medicare and Medicaid patients. Data is available from 1999. Data is collected at the start of care, 60-day follow-ups, and discharge.

1999 -
Geographic Coverage
Subject Domain


Fee Required
Application Required
Data from the Home Health Outcome and Assessment Information Set can be requested using the protocol for other Research identifiable files (RIF) from the Center for Medicare and Medicaid Data Request Center. Requestors must demonstrate expertise and experience to complete their proposed study and will be required to complete a RIF Data Use Agreement
Access via CMS Data Request Center

Application Materials

Study Type