ICD-10-CM > C00-D49 > C43-C44 > C4A > C4A.2 C4A.2 Merkel cell carcinoma of ear and external auricular canal Non-Billable/Non-Specific Codes C4A.20Merkel cell carcinoma of unspecified ear and external auricular canalC4A.21Merkel cell carcinoma of right ear and external auricular canalC4A.22Merkel cell carcinoma of left ear and external auricular canal
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