The federal register for fiscal year 2022 updated 42 CFR 413.24(f)(5)(i)(A) to require that teaching providers file their IRIS data using the XML format for all cost reports with fiscal year beginning on or after October 1, 2021. Federal register instructed teaching providers to ensure that the total graduate medical education (GME) and indirect medical education (IME) full time equivalents (FTEs) reported on the IRIS match total GME and IME FTEs reported on the as-filed cost report. 42 CFR 413.24(f)(5)(i)(A) require teaching providers that claimed GME and IME on their as-filed cost reports to file IRIS data with the as-filed cost report. Cost reports with fiscal year beginning on or after October 1, 2022, that the XML IRIS GME and IME FTEs do not match what is reported on the as-filed cost report will be rejected.
You can find a list of approved XML vendors
here.