ICD-10 Code D37.031 – Neoplasm of uncertain behavior of the sublingual salivary glands (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.031 – Neoplasm of uncertain behavior of the sublingual salivary glands
What it is
This code identifies a growth in the sublingual salivary glands whose behavior is uncertain. It is used when pathology or clinical findings do not confirm whether the lesion is benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a sublingual mass, swelling, or an incidental lesion noted on exam, imaging, or biopsy.
When to use this code
Use D37.031 when the provider documents a neoplasm of uncertain behavior involving the sublingual salivary glands. This is appropriate when the chart shows uncertain biologic behavior, not a confirmed benign or malignant diagnosis. If the site is described differently, check documentation carefully before assigning this code.
Do not use for
Do not use this code for clearly benign or malignant salivary gland tumors. If the record states a different salivary gland site or a definitive diagnosis, code that condition instead.
Coding tip
Verify both the gland location and the phrase “uncertain behavior” in the provider note before coding.