D04.21 (Carcinoma in situ of skin of right ear and external auricular canal) compared with D04.22 (Carcinoma in situ of skin of left ear and external auricular canal), from the official CMS tabular data. D04.21 and D04.22 code the same condition on opposite sides. MedCoder-derived
Same condition; these differ only in which side is documented.
These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.
Source: ICD-10-CM tabular list (laterality variant derived from the code title)
Same condition, opposite side. D04.21 and D04.22 name the same condition on opposite sides of the body.
Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.
| 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 | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of skin of right ear and external auricular canal is a billable ICD-10-CM diagnosis code (D04.21). | Carcinoma in situ of skin of left ear and external auricular canal is a billable ICD-10-CM diagnosis code (D04.22). |
| Includes | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources