ICD-10 Code D00.08 – Carcinoma in situ of pharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D00.08 – Carcinoma in situ of pharynx
What it is
D00.08 identifies carcinoma in situ of the pharynx, a very early cancerous change limited to the surface lining. It means abnormal cells are present, but they have not invaded deeper tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on pathology showing malignant cells confined to the epithelium, without invasion beyond the basement membrane.
When to use this code
Use this code when the provider documents carcinoma in situ involving the pharynx, including the oropharynx, nasopharynx, or hypopharynx if specified as in situ. Code it from confirmed pathology or a clear final diagnosis, not from a rule-out note.
Do not use for
Do not use D00.08 for invasive pharyngeal cancer, dysplasia, or benign lesions. If the record only says “suspected” or “history of” carcinoma in situ, check documentation.
Coding tip
Match the code to the exact anatomic site documented, and confirm that the lesion is described as in situ rather than invasive.