ICD-10 Code D09.2 – Carcinoma in situ of eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D09.2 – Carcinoma in situ of eye
What it is
D09.2 identifies a noninvasive malignant change in the eye tissues. The abnormal cells are confined to the original site and have not spread into nearby structures.
Clinical signs
Clinical features vary; refer to documentation. The record may describe a localized ocular lesion, suspicious neoplastic change, or pathology confirming carcinoma in situ without invasion.
When to use this code
Use D09.2 when the provider documents carcinoma in situ of the eye or a specific ocular site coded to this category. It is appropriate when pathology or clinical assessment confirms in situ disease only. If the note only says “rule out” or “suspected,” check documentation before coding.
Do not use for
Do not use this code for invasive eye cancer, benign ocular growths, or nonspecific abnormal findings. If the documentation does not clearly state carcinoma in situ, check documentation.
Coding tip
Confirm the exact site and whether the lesion is in situ versus invasive before assigning D09.2.