ICD-10 Code D20 – Benign neoplasm of soft tissue of retroperitoneum and peritoneum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D20 – Benign neoplasm of soft tissue of retroperitoneum and peritoneum
What it is
D20 identifies a benign, noncancerous tumor arising in the soft tissue of the retroperitoneum or peritoneum. Use it when documentation states a benign neoplasm in these anatomic sites.
Clinical signs
Clinical features vary; refer to documentation. These masses may be found on imaging, during surgery, or after evaluation of abdominal or retroperitoneal fullness, pain, or pressure effects.
When to use this code
Use D20 when the provider documents a benign soft tissue neoplasm specifically located in the retroperitoneum or peritoneum. It also fits when pathology or imaging confirms a benign tumor in that region and no malignant behavior is reported.
If the record names the site but does not specify the histology, code only what is documented. Check documentation when the lesion is described as uncertain, metastatic, or involving a different abdominal structure.
Do not use for
Do not use D20 for malignant tumors, metastatic disease, or neoplasms in organs outside the retroperitoneum or peritoneum. Do not assume benignity without explicit documentation.
Coding tip
Match the code to the exact anatomic site and behavior stated in the record; if either is unclear, check documentation before coding.