ICD-10 Code D21.4 – Benign neoplasm of connective and other soft tissue of abdomen (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D21.4 – Benign neoplasm of connective and other soft tissue of abdomen
What it is
This code identifies a noncancerous growth arising from connective or other soft tissues in the abdominal area. It indicates a benign mass, not a malignant tumor.
Clinical signs
Clinical features vary; refer to documentation. Patients may have a palpable abdominal mass, localized discomfort, or incidental imaging findings, but the diagnosis should be supported by provider documentation.
When to use this code
Use D21.4 when the provider documents a benign neoplasm of connective or other soft tissue located in the abdomen. This applies to confirmed benign soft tissue tumors, whether found during workup for pain, swelling, or an incidental mass. If the record does not clearly identify the tissue type or location, check documentation.
Do not use for
Do not use this code for malignant abdominal tumors, unspecified abdominal masses, or lesions documented as cysts or inflammatory processes. If the diagnosis is not clearly benign, check documentation.
Coding tip
Verify both benign behavior and abdominal site in the provider note before assigning D21.4.