When the principal diagnosis is one of these 21 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)G23.3–G23.8 (2 codes)G90.01–G90.09 (2 codes)G93.40–G93.41 (2 codes)G93.45–G93.49 (2 codes)I67.83