ICD-10 Code D37.1 – Neoplasm of uncertain behavior of stomach (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D37.1 – Neoplasm of uncertain behavior of stomach
What it is
D37.1 identifies a stomach mass or lesion whose behavior is uncertain. It means the record does not establish whether the growth is benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. You may see an endoscopic or imaging finding described as a gastric polyp, mass, or lesion with uncertain pathology.
When to use this code
Use D37.1 when the provider documents a neoplasm of uncertain behavior in the stomach and the pathology or assessment does not confirm malignancy or benign status. It may also fit when the final diagnosis remains uncertain after evaluation. Check documentation if the site is described more specifically.
Do not use for
Do not use this code for confirmed malignant stomach neoplasms or clearly benign gastric lesions. If the documentation names a different gastric site or a different behavior, code that instead.
Coding tip
Code the documented behavior and site exactly as stated, and query if the pathology report or provider note is unclear.