D09.2 (Carcinoma in situ of eye) compared with D31.1 (Benign neoplasm of cornea), from the official CMS tabular data. D09.2 and D31.1 name the same anatomical site (cornea) with a different neoplasm behavior. MedCoder-derived
Same anatomical site, different neoplasm behavior.
Same site — benign neoplasm (cornea)
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. D09.2 and D31.1 name the same anatomical site (cornea) with a different neoplasm behavior.
From the CMS/CDC 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.
| D09.2Carcinoma in situ of eye | D31.1Benign neoplasm of cornea | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | C00-D49 — Neoplasms | C00-D49 — Neoplasms |
| Definition | Carcinoma in situ of eye is a non-billable ICD-10-CM category code (D09.2). | Benign neoplasm of cornea is a non-billable ICD-10-CM category code (D31.1). |
| Includes | 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