ICD-10 Code C10.8 – Malignant neoplasm of overlapping sites of oropharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C10.8 – Malignant neoplasm of overlapping sites of oropharynx
What it is
This code identifies a malignant tumor of the oropharynx that spans more than one overlapping subsite, so a single exact location cannot be assigned. Use it when documentation shows the cancer crosses site boundaries within the oropharynx.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a visible or biopsied oropharyngeal mass, sore throat, dysphagia, odynophagia, or referred ear pain.
When to use this code
Use C10.8 when the provider documents malignant neoplasm of overlapping oropharyngeal sites, such as a lesion involving more than one adjacent subsite. It is appropriate when the record does not support a single more specific oropharyngeal location. Check documentation if the site is described only broadly or ambiguously.
Do not use for
Do not use this code for cancers confined to one specific oropharyngeal site, such as the tonsil, base of tongue, soft palate, or other separate subsites. If the primary site is unclear, check documentation before coding.
Coding tip
Code the most specific documented oropharyngeal site first; use C10.8 only when the tumor truly overlaps multiple subsites.