ICD-10 Code D37 – Neoplasm of uncertain behavior of oral cavity and digestive organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37 – Neoplasm of uncertain behavior of oral cavity and digestive organs
What it is
D37 identifies a neoplasm in the oral cavity or digestive organs whose behavior is uncertain. Use it when the record shows a tumor, but pathology or documentation does not confirm whether it is benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a mass, lesion, or abnormal tissue in the mouth, esophagus, stomach, intestines, or related digestive structures, with uncertain pathology or behavior.
When to use this code
Use D37 when the clinician documents an uncertain-behavior neoplasm involving the oral cavity or digestive organs and no more specific code is available. It also applies when pathology, imaging, or operative notes describe a lesion as indeterminate. Check the exact organ site and document any laterality or subsite if reported.
Do not use for
Do not use D37 if the lesion is documented as benign, malignant, in situ, or metastatic. If documentation is unclear, check documentation rather than assuming uncertain behavior.
Coding tip
Code the most specific site documented, and confirm that the record explicitly supports uncertain behavior before assigning D37.