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Data Specifications

Updated OASIS Data Specifications Errata Document

An updated errata document has been posted for V2.10 and V2.11 of the data submission specifications.  This new version of the errata is dated September 16, 2014 and contains two new issues (A51 and A52) which apply to both sets of specifications.

OASIS Data Specifications V2.11.2 and Errata Document

An updated draft version of the OASIS-C1 data submission specifications (V2.11.2) has been posted.  This version reflects changes to the OASIS-C1 item set which were made in response to the delay in implementation of ICD-10 diagnosis coding.  The new item set and data specifications have been modified to revert back to ICD-9 coding for items that contain diagnosis codes.

An updated data specifications errata document has also been posted.  This document lists changes that were made in V2.11.2 of the data specifications.  It also lists changes that apply to V2.10.1 of the data specifications (which supports OASIS-C).  Because the issues related to V2.10.1 are relatively minor, a new versions of the OASIS-C data specifications is not planned at this time.  Users of the data specifications should therefore take note of the issues which apply to V2.10.1 which are listed in Sections A and B of the errata document.

V2.10.1 and V2.11.2 of the data specifications support the submission of XML files to the ASAP system and will become effective on January 1, 2015.  All OASIS-C and OASIS-C1 data that are submitted on or after January 1, 2015 must conform with these specifications.  Both versions should be considered draft and are subject to change.

Final OASIS-C Data Specifications Version 2.00

A final version of the OASIS-C Data Specifications Version 2.00 is now available.  This version is a revision to the initial draft published in July, 2009.  The primary purpose of Version 2.00 is to incorporate changes associated with the OASIS-C data set that Home Health Agencies (HHAs) are required to collect in order to participate in the Medicare program.

The final OASIS-C instrument is on the OASIS-C website (see Related Links Inside CMS).

In the download section below, you will find the final OASIS-C Version 2.00 data specifications in four different formats (PDF, Excel, Access and HTML) and a three-column crosswalk document of OASIS-B1 items to OASIS-C items.  Please note that the HTML version of the OASIS-C data specifications provide sort order of submission and logical orders.

Correction 3: Data Submission Specifications Version 2.00

An initial draft version of Version 2.00 of the OASIS-C data specifications was published in July, 2009. Revision 1 contained several corrections to the original draft and was published at the beginning of August, 2009. The current version is a third revision and corrects several additional errors in the earlier versions. Please refer to BC200R3.PDF for a list of corrections that have been made. Changes are also noted in the “version notes” field of the detailed data specifications report. Changes associated with Revision 1 are designated with “[R1]” before the description of the change, while changes associated with Revision 2 are designated with “[R2]”. Changes associated with the current revision (Revision 3) are designated with “[R3]”.

ERRATA SHEET: Data Submission Specifications Version 2.00

Please include this errata sheet with the current OASIS-C Version 2.00 Data Specifications.  This document is intended to communicate the minimal changes that have been made since the posting of REVISON 3 of the OASIS-C Version 2.00 Data Specifications.  The current OASIS-C Version 2.00 Data Specifications will be updated and posted in its entirety at a future date.  See Downloads below for details on the Errata Sheet.