ICD-10 Code D21.6 – Benign neoplasm of connective and other soft tissue of trunk, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D21.6 – Benign neoplasm of connective and other soft tissue of trunk, unspecified
What it is
This code identifies a noncancerous growth arising from connective or other soft tissue in the trunk. Use it when the record specifies a benign neoplasm but does not identify a more exact site or tissue type.
Clinical signs
Clinical features vary; refer to documentation. Benign soft tissue masses are often described as a localized lump, swelling, or slowly enlarging lesion, with diagnosis supported by imaging, examination, or pathology when available.
When to use this code
Use D21.6 when the provider documents a benign neoplasm of soft tissue in the trunk and the site is not further specified. It also fits when the record confirms benign behavior but lacks enough detail for a more specific code. If the lesion is laterality-specific or named more precisely, code the documented detail instead.
Do not use for
Do not use this code for malignant, uncertain, or unspecified neoplasms without benign confirmation. Check documentation if the mass is a cyst, lipoma at a more specific site, or a lesion outside the trunk.
Coding tip
Query for the exact anatomic site and pathology wording before defaulting to an unspecified trunk code.