ICD-10 Code D00.05 – Carcinoma in situ of hard palate (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D00.05 – Carcinoma in situ of hard palate
What it is
D00.05 identifies carcinoma in situ limited to the hard palate. The abnormal cells are confined to the epithelium and have not invaded deeper tissue.
Clinical signs
Findings may include a persistent oral lesion, leukoplakia, erythema, ulceration, or a suspicious mucosal change on the hard palate. Clinical features vary; refer to documentation.
When to use this code
Use D00.05 when the provider documents carcinoma in situ specifically involving the hard palate. It is appropriate for pathology-confirmed or clinically diagnosed in situ disease without invasion. If the site is broader or unclear, check documentation.
Do not use for
Do not use this code for invasive malignant neoplasm of the palate or for lesions in other oral sites. Do not assign it when the record only says dysplasia, leukoplakia, or “rule out” carcinoma in situ.
Coding tip
Verify the exact anatomic site and the term “in situ” before coding; if the pathology report is nonspecific, check documentation.