ICD-10 Code D00.07 – Carcinoma in situ of tongue (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D00.07 – Carcinoma in situ of tongue
What it is
D00.07 identifies carcinoma in situ of the tongue, meaning abnormal cells are confined to the surface layer and have not invaded deeper tissue. Use it for a documented preinvasive tongue lesion.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe a suspicious tongue lesion confirmed as carcinoma in situ by pathology, without evidence of invasion.
When to use this code
Use D00.07 when the provider documents carcinoma in situ specifically involving the tongue. It fits pathology-confirmed, noninvasive lesions of the oral tongue or tongue base only if the record clearly states the site. If later notes describe invasion, check documentation and code the confirmed diagnosis.
Do not use for
Do not use this code for invasive tongue cancer, dysplasia without carcinoma in situ, or unspecified oral cavity lesions. If the site is not clearly the tongue, check documentation before coding.
Coding tip
Match the diagnosis wording and site exactly; if the pathology report says “in situ” and names the tongue, D00.07 is appropriate.