ICD-10 Code G61.0 – Guillain-Barre Syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G61.0 – Guillain-Barre syndrome
What it is
G61.0 identifies Guillain-Barre syndrome, an acute immune-mediated neuropathy that affects the peripheral nerves. It usually causes rapidly developing weakness and reduced reflexes.
Clinical signs
Typical findings include symmetric weakness that often starts in the legs, diminished or absent deep tendon reflexes, and possible sensory symptoms. Clinical features vary; refer to documentation.
When to use this code
Use G61.0 when the provider documents Guillain-Barre syndrome, Guillain-Barré syndrome, or acute inflammatory demyelinating polyneuropathy consistent with this diagnosis. Code the condition when the chart supports an acute ascending neuropathy or related variant. Check documentation if the record only says neuropathy or weakness.
Do not use for
Do not use this code for chronic neuropathies, generalized weakness without a confirmed diagnosis, or other specified inflammatory polyneuropathies. If the documentation names another cause, code that condition instead.
Coding tip
Verify the exact provider diagnosis and avoid assigning G61.0 from symptoms alone.