ICD-10 Code D20.0 – Benign neoplasm of soft tissue of retroperitoneum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D20.0 – Benign neoplasm of soft tissue of retroperitoneum
What it is
D20.0 identifies a noncancerous growth arising from soft tissue in the retroperitoneal space, the area behind the abdominal lining. Use it when the provider documents a benign soft tissue neoplasm in that location.
Clinical signs
Clinical features vary; refer to documentation. These masses may be incidental or cause vague abdominal, back, or flank discomfort when they become large enough to affect nearby structures.
When to use this code
Use D20.0 when the record clearly states a benign soft tissue tumor of the retroperitoneum, such as on pathology, imaging, or operative documentation. You should code it when the diagnosis is established and the site is specifically retroperitoneal. If the note only says “mass” or “lesion,” check documentation before assigning this code.
Do not use for
Do not use this code for malignant retroperitoneal tumors, uncertain behavior neoplasms, or benign tumors in other anatomic sites. Check documentation if the location is retroperitoneal but the tissue type is not clearly soft tissue.
Coding tip
Confirm both benign behavior and retroperitoneal soft tissue origin before coding D20.0.