ICD-10 Code D21.9 – Benign neoplasm of connective and other soft tissue, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D21.9 – Benign neoplasm of connective and other soft tissue, unspecified
What it is
D21.9 identifies a noncancerous growth arising from connective or other soft tissues when the specific site is not documented. Use it when the record confirms a benign soft tissue neoplasm but does not name the exact tissue.
Clinical signs
Clinical features vary; refer to documentation. These masses are often described as a localized lump, swelling, or palpable lesion, with imaging or pathology confirming benign behavior.
When to use this code
Use D21.9 when the provider documents a benign neoplasm of connective or soft tissue and does not specify the anatomic site. It also fits cases where pathology confirms benignity, but the chart lacks a more precise site description. If the lesion is named and coded elsewhere, choose the more specific code instead.
Do not use for
Do not use this code for malignant tumors, uncertain behavior, or lesions documented as cysts, lipomas, or other specific diagnoses with dedicated codes. Check documentation.
Coding tip
Code to the most specific soft tissue site available; if the location is missing, D21.9 is the appropriate unspecified option.