ICD-10 Code G61.89 – Other inflammatory polyneuropathies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G61.89 – Other inflammatory polyneuropathies
What it is
Use this code for inflammatory polyneuropathy that does not fit a more specific ICD-10 category. It refers to multiple peripheral nerve involvement caused by inflammation, with the exact subtype left unspecified.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include symmetric weakness, sensory changes, reduced reflexes, or progressive neuropathic symptoms affecting more than one nerve.
When to use this code
Assign G61.89 when the provider documents an inflammatory polyneuropathy but does not name a specific type such as Guillain-Barré syndrome or chronic inflammatory demyelinating polyneuropathy. Use it when the record supports inflammatory neuropathy and no more specific code is available. Check documentation if the cause or subtype is unclear.
Do not use for
Do not use this code for noninflammatory neuropathies, isolated mononeuropathy, or polyneuropathy with a clearly documented, more specific diagnosis. If the condition is better described elsewhere, code that diagnosis instead.
Coding tip
Code the most specific inflammatory neuropathy documented; use G61.89 only when the record supports the condition but lacks a more precise subtype.