When the principal diagnosis is one of these 23 codes, the CC/MCC codes assigned to this list count as non-CCs (MS-DRG v44 definitions manual, appendix C).
G20.A1–G20.C (5 codes)G21.11–G21.9 (7 codes)G90.01–G90.09 (2 codes)G90.3G93.40–G93.49 (7 codes)I67.83