Benign neoplasm of soft tissue of retroperitoneum

This code identifies a non-malignant growth originating from the connective tissues within the retroperitoneal space. These benign tumors are typically slow-growing and do not metastasize, but their size and location can still cause symptoms due to compression of surrounding organs or structures.

Assign this code when documentation confirms a benign neoplasm located in the retroperitoneum, such as a lipoma, fibroma, or leiomyoma. This diagnosis is often established through imaging studies (e.g., CT, MRI) and confirmed by biopsy or surgical pathology.

• Ensure the pathology report explicitly states "benign" and specifies the retroperitoneal location.
• Do not use this code if the neoplasm is described as uncertain, unspecified, or malignant; refer to the appropriate C-series or D37-D48 codes.
• Code any associated symptoms (e.g., abdominal pain, hydronephrosis) as secondary diagnoses.