OASIS User Manuals

November 7, 2023

NOW AVAILABLE: Updated OASIS-E Manual

The 2024 update to the OASIS-E Manual, and the associated Change Table, are available in the Downloads section on the OASIS Users Manuals page. 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.

 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 page. A log of changes from the draft to final instrument and Manual is also available in the Downloads section on the OASIS Users Manuals page.  

May 16, 2022

NOW AVAILABLE: Draft OASIS-E Guidance Manual

The draft Guidance Manual for the Outcome Assessment Information Set Version E (OASIS-E) of the OASIS data set, effective January 1, 2023, is available in the Downloads section below.

May 14, 2019

A revised version of the memorandum containing details about the changes to OASIS effective January 1, 2020, is available in the Downloads section below. The memorandum was updated from the previous version that was posted to include detail addressing the transition to the Patient-Driven Groupings Model.

April 05, 2019

A memorandum containing details about the changes to OASIS effective January 1, 2020, is available in the Downloads section below. The effective date is January 1, 2020.

OASIS Data Set Technical Specifications

The OASIS data set specifications for encoding and transmission of OASIS assessments are available on the Data Specifications webpage.

OASIS Data Collection via jHAVEN

Documentation for using jHAVEN software can be found on the jHAVEN webpage, accessible via the jHAVEN link in the Related Links section below.

Related Links

• iQIES
• QIES
• OASIS Q&As
• jHAVEN