ICD-10 Code G63 – Polyneuropathy in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G63 – Polyneuropathy in diseases classified elsewhere
What it is
G63 identifies polyneuropathy that is caused by another underlying disease. You use it when the nerve damage is documented as secondary to a separate condition, not as an independent disorder.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include symmetric sensory loss, numbness, tingling, weakness, or reduced reflexes, but the underlying cause should be identified in the record.
When to use this code
Use G63 when the provider documents polyneuropathy as due to another disease, such as a systemic or metabolic condition. Code the underlying condition first when instructed by coding guidance, and confirm the causal link is clearly stated.
It is also appropriate when the note specifically ties the neuropathy to a disease classified elsewhere. If the cause is not documented, check documentation before assigning this code.
Do not use for
Do not use G63 for polyneuropathy without a documented underlying disease. Do not use it when the record describes a different neurologic disorder or when the cause is uncertain.
Coding tip
Always verify the linked underlying condition in the provider’s note before coding G63.