ICD-10 Code D37.09 – Neoplasm of uncertain behavior of other specified sites of the oral cavity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.09 – Neoplasm of uncertain behavior of other specified sites of the oral cavity
What it is
This code identifies a growth in another specified oral cavity site where the pathology cannot yet determine whether it is benign or malignant. Use it when the site is documented, but the biologic behavior remains uncertain.
Clinical signs
Clinical features vary; refer to documentation. You may see an oral mass, mucosal lesion, swelling, ulceration, or an abnormal finding noted on exam, imaging, or biopsy.
When to use this code
Use D37.09 when the provider documents a neoplasm of uncertain behavior in an oral cavity site not named by a more specific code. This is appropriate after evaluation or biopsy when the lesion is still classified as uncertain behavior. If the record names the exact oral site, code that site instead.
Do not use for
Do not use this code for clearly benign or malignant oral lesions, or when documentation supports a different neoplasm code. Check documentation if the site is not specified or if the lesion is a non-neoplastic oral condition.
Coding tip
Verify both the exact oral site and the phrase “uncertain behavior” before assigning D37.09.