OASIS User Manuals

December 18, 2025

Review the OASIS-E2 Guidance manual for additional information and the Item Change and Edit Change reports within the data specifications. The draft Guidance Manual for the OASIS-E2 version of the OASIS data set, effective April 1, 2026, is available in the Downloads below. 

December 12, 2024

NOW AVAILABLE- Final version of the OASIS-E1 Manual and Change Table   

The final version of the OASIS-E1 Manual, and the change table OASIS-E1 Changes from May 2024 Draft to Dec 2024 Final Manual, are now available in the Downloads section below. 

November 7, 2023

NOW AVAILABLE: Updated OASIS-E Manual

The 2024 update to the Outcome and Assessment Information Set Version E (OASIS-E) Manual, and the associated Change Table, are available in the Downloads section on the OASIS Users Manuals webpage. There are no changes to the OASIS-E instrument. The changes incorporate guidance into the manual and Q&As from the CMS Quarterly Q&As dated July 2022 through October 2023.

December 14, 2022

NOW AVAILABLE: Final OASIS-E Manual

The final OASIS-E Manual, effective January 1, 2023, is available in the Downloads section below. A log of changes since the last posting is also available.

Please note that the effective date for OASIS-E is January 1, 2023. The version of OASIS that should be collected will be based on the M0090 – Date Assessment Completed. The M0090 date is the last date that information used to complete the comprehensive assessment and determine OASIS coding was gathered by the assessing clinician and documentation of the specific responses was completed.

The Centers for Medicare & Medicaid Services (CMS) wants to make clear that with this transition to OASIS-E, there is no need for the use of artificial M0090 dates. All assessments with a M0090 - Date Assessment Completed on or before December 31, 2022, including the last 5 days of 2022 must be completed with OASIS-D1.  This is true even when the first day of the new certification period is on or after January 1, 2023.

All assessments with a M0090 - Date Assessment Completed on or after January 1, 2023, must be completed with OASIS-E. This is true even when the assessment was initiated in 2022.

December 6, 2022

The final OASIS-E instrument, effective January 1, 2023, is available in the Downloads section on the  OASIS Data Sets webpage. A log of changes from the draft to final instrument and Manual is also available in the Downloads section on the OASIS Users Manuals webpage.