ICD-10 Code D16.20 – Benign neoplasm of long bones of unspecified lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D16.20 – Benign neoplasm of long bones of unspecified lower limb
What it is
This code identifies a noncancerous tumor arising in a long bone of the lower limb when the exact bone is not specified. Use it when documentation confirms a benign bone neoplasm but does not name the femur, tibia, fibula, or another specific site.
Clinical signs
Clinical features vary; refer to documentation. Benign bone tumors may be found after pain, swelling, a palpable mass, or an incidental imaging finding, but the record must support a benign neoplasm.
When to use this code
Use D16.20 when the provider documents a benign neoplasm in a long bone of the lower limb and laterality or exact bone is not identified. It also fits when imaging or pathology confirms benign behavior, but the note only states “lower limb long bone.” If the site is specified, choose the more precise code.
Do not use for
Do not use this code for malignant bone tumors, metastatic disease, or non-neoplastic bone lesions. Do not assign it when the documentation identifies a specific bone and a more exact code is available.
Coding tip
Check the operative note, pathology, and imaging report for the exact bone and laterality before defaulting to this unspecified code.