CMS released a PDF file labeled “MDS 3.0RAIManualv1.17.1R.Errata.October.1.2021,” available in the Downloads section of the MDS 3.0 RAI Manual webpage. This file contains revisions to pages in Chapter 6 of the MDS 3.0 RAI Manual v1.17.1R that update the NTA Comorbidity Score Calculation table. Changed manual pages are marked with the footer “October 2019 (R).” The errata document begins with a table that lists all identified revisions and the pages to which they have been applied. Following the table are the actual corrected replacement pages for insertion into the printed manual.