When the principal diagnosis is one of these 10 codes, the CC/MCC codes assigned to this list count as non-CCs (MS-DRG v44 definitions manual, appendix C).
T21.30XA
T21.33XA
T21.34XA
T21.35XA
T21.39XA
T21.70XA
T21.73XA
T21.74XA
T21.75XA
T21.79XA