ICD-10-CM > C00-D49 > C43-C44 > C4A > C4A.3 C4A.3 Merkel cell carcinoma of other and unspecified parts of face Non-Billable/Non-Specific Codes C4A.30Merkel cell carcinoma of unspecified part of faceC4A.31Merkel cell carcinoma of noseC4A.39Merkel cell carcinoma of other parts of face