ICD-10 Code C10.9 – Malignant neoplasm of oropharynx, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C10.9 – Malignant neoplasm of oropharynx, unspecified
What it is
This code identifies a malignant tumor in the oropharynx when the specific site is not documented. Use it for cancer involving the tonsillar region, base of tongue, soft palate, or pharyngeal wall only when the record does not specify a more exact location.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include a visible or biopsy-proven oropharyngeal mass, persistent sore throat, dysphagia, odynophagia, or neck lymphadenopathy.
When to use this code
Use C10.9 when the provider documents malignant neoplasm of the oropharynx but does not name the exact subsite. It also fits cases where pathology or imaging confirms an oropharyngeal primary, yet the chart remains nonspecific. If the site is later clarified, report the more specific code.
Do not use for
Do not use this code for benign or dysplastic lesions, metastatic disease to the oropharynx, or cancers with a documented more specific oropharyngeal site. Check documentation.
Coding tip
If the note names the tonsil, base of tongue, soft palate, or pharyngeal wall, code the specific site instead of the unspecified category.