ICD-10 Code C47.12 – Malignant neoplasm of peripheral nerves of left upper limb, including shoulder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C47.12 – Malignant neoplasm of peripheral nerves of left upper limb, including shoulder
What it is
C47.12 identifies a malignant tumor arising from the peripheral nerves in the left upper limb, including the shoulder. Use it when documentation specifies a cancer involving those nerves, not a skin, bone, or soft tissue primary.
Clinical signs
Findings may include a palpable mass, pain, numbness, weakness, or other nerve-related deficits in the left arm or shoulder. Clinical features vary; refer to documentation for the exact nerve site and malignant behavior.
When to use this code
Use this code when the provider documents a malignant neoplasm of a peripheral nerve in the left upper limb or shoulder region. It also fits when pathology or imaging supports a nerve-origin cancer at that site and laterality is clearly left.
If the record only says “peripheral nerve tumor” without malignant confirmation, check documentation before assigning C47.12. Make sure you are not coding a metastatic lesion to the nerve from another primary site.
Do not use for
Do not use this code for benign peripheral nerve tumors, unspecified laterality, or neoplasms outside the left upper limb and shoulder. Check documentation if the primary site is uncertain.
Coding tip
Confirm both malignancy and left-sided location in the provider record before coding C47.12.