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).
K31.89
K31.9
K40.00
K40.91
K45.0
K45.8
K46.0
K92.81
K40.01
K40.10
K40.11
K40.30
K40.31
K40.40
K40.41