ICD-10 Code C47.9 – Malignant neoplasm of peripheral nerves and autonomic nervous system, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C47.9 – Malignant neoplasm of peripheral nerves and autonomic nervous system, unspecified
What it is
C47.9 identifies a malignant tumor arising from the peripheral nerves or autonomic nervous system when the exact site is not specified. Use it when documentation confirms this cancer category but does not name a more precise location.
Clinical signs
Clinical features vary; refer to documentation. Commonly, these tumors present as a growing mass, pain, numbness, weakness, or other nerve-related deficits, but coding should follow the documented diagnosis rather than symptoms alone.
When to use this code
Use C47.9 when the provider documents a malignant neoplasm of peripheral nerves or autonomic nervous system and does not specify the anatomic site. It also fits when the record states the tumor is unspecified within this category. If the site is later clarified, code the more specific option instead.
Do not use for
Do not use C47.9 for benign nerve tumors, metastatic disease to nerves, or cancers with a clearly documented more specific site. Check documentation if the record identifies a different primary malignancy.
Coding tip
Query for the exact nerve or autonomic structure when the note says only “malignant neoplasm” without a site.