D01.3 (Carcinoma in situ of anus and anal canal) compared with D12.9 (Benign neoplasm of anus and anal canal), from the official CMS tabular data. D01.3 and D12.9 name the same anatomical site (anorectum) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (anorectum)
The behavior documented for the site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column of the neoplasm table, and therefore which code, applies.
Source: CMS Table of Neoplasms
Same site, different neoplasm behavior. D01.3 and D12.9 name the same anatomical site (anorectum) with a different neoplasm behavior.
From the CMS Table of Neoplasms: the behavior documented for that site — malignant primary, secondary, carcinoma in situ, benign, uncertain or unspecified — decides which column, and therefore which code, applies.
| D01.3Carcinoma in situ of anus and anal canal | D12.9Benign neoplasm of anus and anal canal | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of anus and anal canal is a billable ICD-10-CM diagnosis code (D01.3). | Benign neoplasm of anus and anal canal is a billable ICD-10-CM diagnosis code (D12.9). |
| Includes | Bowen's disease erythroplasia grade III intraepithelial neoplasia Queyrat's erythroplasia | Benign neoplasm of anus NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources