ICD-10 Code D16.21 – Benign neoplasm of long bones of right lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D16.21 – Benign neoplasm of long bones of right lower limb
What it is
This code identifies a noncancerous tumor in a long bone of the right lower limb, such as the femur, tibia, or fibula. Use it when documentation specifies a benign neoplasm at that site.
Clinical signs
Clinical features vary; refer to documentation. Benign bone tumors may be found incidentally or after pain, swelling, or a palpable mass prompts imaging and further evaluation.
When to use this code
Use D16.21 when the provider documents a benign neoplasm involving a long bone in the right leg. It is appropriate for confirmed pathology, imaging-supported diagnosis, or clear specialist assessment. You should code the documented anatomic site, not a general lower-limb mass.
Do not use for
Do not use this code for malignant bone tumors, metastatic disease, or benign lesions in the left lower limb or unspecified side. Check documentation if the lesion site is not clearly identified.
Coding tip
Verify both laterality and bone location in the record before assigning D16.21.