When the principal diagnosis is one of these 18 codes, the CC/MCC codes assigned to this list count as non-CCs (MS-DRG v44 definitions manual, appendix C).
S25.501AS25.502AS25.509AS25.511AS25.512AS25.519AS25.591AS25.592AS25.599AS25.801AS25.802AS25.809AS25.811AS25.812AS25.819AS25.891AS25.892AS25.899A