Convert ICD-10-CM C43.21 to ICD-9-CM

ICD-10-CM C43.21 converts approximately to:
  • 2015 ICD-9-CM 172.2 Malignant melanoma of skin of ear and external auditory canal

Note: approximate conversions between ICD-9-CM codes and ICD-10-CM codes may require clinical interpretation in order to determine the most appropriate conversion code(s) for your specific coding situation.

Source: 2020 ICD-10-CM CMS General Equivalence Mappings.