ICD-10-CM diagnosis code
D04.21 Carcinoma in situ of skin of right ear and external auricular canal
- Billable
- Yes, a complete code (FY2026)
- Category
- D04 Carcinoma in situ of skin
- Chapter
- 2. Neoplasms
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Other codes in D04
21 complete codes in this category.
- D04.10Carcinoma in situ of skin of unspecified eyelid, including canthus
- D04.111Carcinoma in situ of skin of right upper eyelid, including canthus
- D04.112Carcinoma in situ of skin of right lower eyelid, including canthus
- D04.121Carcinoma in situ of skin of left upper eyelid, including canthus
- D04.122Carcinoma in situ of skin of left lower eyelid, including canthus
- D04.20Carcinoma in situ of skin of unspecified ear and external auricular canal
- D04.21Carcinoma in situ of skin of right ear and external auricular canal
- D04.22Carcinoma in situ of skin of left ear and external auricular canal
- D04.30Carcinoma in situ of skin of unspecified part of face
- D04.39Carcinoma in situ of skin of other parts of face
- D04.4Carcinoma in situ of skin of scalp and neck
- D04.5Carcinoma in situ of skin of trunk
Documentation tips
- Make sure the note supports every element of the title, “Carcinoma in situ of skin of right ear and external auricular canal”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to D04.
The international WHO ICD-10 also has D04, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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