ICD-10 Code C47.21 – Malignant neoplasm of peripheral nerves of right lower limb, including hip (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C47.21 – Malignant neoplasm of peripheral nerves of right lower limb, including hip
What it is
This code identifies a malignant tumor arising from the peripheral nerves in the right lower limb, including the hip region. Use it when documentation specifies a primary cancer of those nerves on the right side.
Clinical signs
Clinical features vary; refer to documentation. Commonly, a patient may have a mass, pain, numbness, weakness, or other nerve-related deficits in the right leg or hip area, with imaging or pathology supporting malignancy.
When to use this code
Use C47.21 when the provider documents a malignant neoplasm of a peripheral nerve in the right lower extremity or hip. It also fits confirmed primary nerve malignancy after biopsy, surgery, or oncology evaluation. Check documentation if the site is described only as soft tissue or if laterality is unclear.
Do not use for
Do not use this code for benign nerve tumors, metastatic disease to the nerve, or unspecified laterality. If the record does not clearly identify a peripheral nerve primary, check documentation.
Coding tip
Verify both laterality and anatomic site; C47.21 is specific to the right lower limb, including hip.