ICD-10 Code G58.8 – Other specified mononeuropathies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G58.8 – Other specified mononeuropathies
What it is
G58.8 identifies a mononeuropathy affecting a single peripheral nerve that does not fit a more specific ICD-10 category. Use it when documentation names a particular nerve disorder but no dedicated code exists.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include localized numbness, weakness, pain, or reduced reflexes in the distribution of one peripheral nerve.
When to use this code
Use G58.8 when the provider documents an isolated peripheral nerve disorder and the record supports that it is not a listed mononeuropathy such as carpal tunnel syndrome or ulnar neuropathy. It is appropriate when the nerve involved is specified, but no more specific code applies. Check documentation for laterality and underlying cause if recorded.
Do not use for
Do not use this code for generalized polyneuropathy, radiculopathy, or entrapment neuropathies with a more specific ICD-10 option. If the chart supports a named condition with its own code, use that code instead.
Coding tip
Confirm the exact nerve and whether the condition is idiopathic, traumatic, or due to another disease before selecting G58.8.