When the principal diagnosis is one of these 26 codes, the CC/MCC codes assigned to this list count as non-CCs (MS-DRG v44 definitions manual, appendix C).
P22.1
P22.9
P24.00
P24.10
P24.20
P24.30
P24.80
P28.2
P28.9
P29.81
R06.81
R09.2
P28.81