OASIS Data Sets


May 08, 2020

Delayed: Release of Updated Version of the Home Health Assessment Instrument

CMS is delaying the release of the updated version of the Outcome and Assessment Information Set (OASIS) needed to support the Transfer of Health (TOH) Information Quality Measures and new or revised Standardized Patient Assessment Data Elements (SPADEs) in order to provide maximum flexibilities for providers of Home Health Agencies (HHAs) to respond to the COVID-19 Public Health Emergency (PHE).

The release of the updated version of the OASIS will be delayed until January 1st of the year that is at least 1 full calendar year after the end of the COVID-19 PHE. For example, if the COVID-19 PHE ends on April 30, 2021, home health agencies will be required to begin collecting data using the updated versions of the item sets beginning with patients discharged on January 1, 2023.

Please refer to the Interim Final Rule, CMS-5531-IFC (PDF), starting on page 160, for more information on the PHE and its impact on the OASIS.

March 18, 2020


The draft OASIS-E All Items Instrument is now available in the Downloads section of the OASIS Data Sets webpage. OASIS-E will be effective January 01, 2021. Please note the instrument is not yet final. Office of Management and Budget (OMB) approval is required and expected later this year.

April 05, 2019

Revised versions of the OASIS-D All Items instrument and the Follow-up (FU) time point instrument are available. These versions are effective January 1, 2020. The original OASIS-D versions for all other time points remain in effect as of January 1, 2020. The revised All Items and Follow-Up instruments with the remaining OASIS-D time point versions are available together in a zip file in the Download section, below. A memorandum containing details about the changes to OASIS effective January 1, 2020 is available on the OASIS User Manuals.

December 20, 2018

Effective January 1, 2019, OASIS-D is the current version of the OASIS data set. The OASIS-D instrument was approved by the Office of Management and Budget (OMB) on December 6, 2018. The final OASIS-D instrument is available in the Downloads section, below. The final OASIS-D Guidance Manual is available on the OASIS User Manuals webpage.


  • The OASIS-D is effective January 1, 2019.
  • This version includes multiple new standardized items (GG0130, GG0170a-b, d-s, J1800, J1900) to support measurement domains mandated by the Improving Medicare Post-Acute Care Transformation (IMPACT) Act. New items were also added for standardization to align with the Inpatient Rehabilitation Facility-Patient Assessment Instrument (IRF-PAI), the Long-term Care Hospital assessment set, and the Minimum Data Set (MDS): GG0100 Prior Function and G0110 Prior Device Use
  • OASIS item M1311 was modified to support a new standardized pressure ulcer measure to replace the current standardized pressure ulcer measure.
  • Several items were removed, including select data elements at different time points, to reduce provider and patient burden.
  • The complete set of OASIS-D data items can be found in the Downloads section below.

OASIS and Medicare Home Health PPS

The most current information about Home Health Prospective Payment System (PPS) and the use of OASIS can be found on the Home Health PPS web page via the link in the “Related Links” section below.


Page Last Modified:
07/07/2021 09:25 AM