ICD-10 Code D37.9 – Neoplasm of uncertain behavior of digestive organ, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.9 – Neoplasm of uncertain behavior of digestive organ, unspecified
What it is
D37.9 identifies a neoplasm in a digestive organ whose behavior is uncertain, meaning the pathology cannot yet be classified as clearly benign or malignant. Use it when the digestive site is unspecified.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a mass, abnormal imaging, or biopsy findings that prompt concern, but the record must show uncertain behavior and an unspecified digestive organ site.
When to use this code
Use D37.9 when the provider documents an uncertain-behavior neoplasm involving the digestive system and does not specify the organ. It is appropriate for initial workup, pathology reports, or follow-up notes when the site remains unclear. Check documentation if the record names a specific digestive organ.
Do not use for
Do not use this code for benign or malignant digestive neoplasms, or when the diagnosis is a cyst, polyp, or inflammatory lesion without uncertain behavior. Do not guess the organ site.
Coding tip
Query for the exact digestive organ and behavior before assigning D37.9.