ICD-10 Code D37.6 – Neoplasm of uncertain behavior of liver, gallbladder and bile ducts (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.6 – Neoplasm of uncertain behavior of liver, gallbladder and bile ducts
What it is
D37.6 identifies a neoplasm in the liver, gallbladder, or bile ducts whose behavior is uncertain. Use it when the record documents a mass or tumor, but pathology has not confirmed whether it is benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Patients may have an incidental imaging finding, biliary obstruction, abdominal pain, jaundice, or a mass described as indeterminate or of uncertain behavior.
When to use this code
Use D37.6 when the provider documents an uncertain-behavior tumor involving the liver, gallbladder, or bile ducts. It also fits cases where pathology or imaging supports neoplasm, but the final biologic behavior is not established. If the site is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for clearly benign or malignant neoplasms, metastatic disease, or nonspecific liver or biliary disorders without a documented neoplasm. Check documentation if the lesion is described only as a cyst, polyp, or abscess.
Coding tip
Verify the exact anatomic site in the report, because D37.6 covers liver, gallbladder, and bile ducts together.