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).
D78.81–D78.89 (2 codes)H95.811–H95.89 (6 codes)I97.3M96.89N98.1–N98.9 (5 codes)T81.82XAT81.89XAT81.9XXA