ICD-10 Code D37.0 – Neoplasm of uncertain behavior of lip, oral cavity and pharynx (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.0 – Neoplasm of uncertain behavior of lip, oral cavity and pharynx
What it is
D37.0 identifies a growth in the lip, oral cavity, or pharynx whose behavior is uncertain. Use it when the record shows a neoplasm, but the provider has not documented whether it is benign or malignant.
Clinical signs
Findings may include a visible or palpable oral or throat mass, mucosal lesion, ulceration, or unexplained swelling. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents an uncertain-behavior neoplasm affecting the lip, mouth, tongue, palate, tonsil, or pharyngeal structures. It is appropriate for pathology or clinical notes that describe indeterminate behavior, pending final classification, or atypia without a stated malignant diagnosis.
Do not use for
Do not use D37.0 when the lesion is documented as clearly benign or malignant. If the site or behavior is not specified, check documentation before assigning this code.
Coding tip
Code the documented anatomic site and avoid assuming behavior from imaging alone.