ICD-10 Code G61.9 – Inflammatory polyneuropathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G61.9 – Inflammatory polyneuropathy, unspecified
What it is
G61.9 identifies an inflammatory disorder affecting multiple peripheral nerves when the specific type is not documented. Use it when the record confirms inflammatory polyneuropathy, but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include symmetric weakness, sensory changes, reduced reflexes, or progressive peripheral nerve dysfunction consistent with an inflammatory neuropathic process.
When to use this code
Use this code when the clinician documents inflammatory polyneuropathy without further detail, such as an unspecified immune-mediated or inflammatory neuropathy. It also fits when the chart supports the condition but does not identify a more specific subtype. If the note names a defined disorder, code that diagnosis instead.
Do not use for
Do not use G61.9 for neuropathy caused by diabetes, toxins, compression, or other non-inflammatory etiologies. Check documentation if the record identifies a specific inflammatory neuropathy that has its own code.
Coding tip
Query for the exact neuropathy type whenever the documentation only says “inflammatory neuropathy” or “polyneuropathy.”