ICD-10 Code A36.83 – Diphtheritic polyneuritis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A36.83 – Diphtheritic polyneuritis
What it is
Diphtheritic polyneuritis is a nerve disorder caused by diphtheria toxin. It involves inflammation or damage to multiple peripheral nerves, usually as a complication of diphtheria infection.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include weakness, reduced reflexes, sensory changes, and cranial nerve involvement after diphtheria.
When to use this code
Use A36.83 when the provider documents polyneuritis due to diphtheria or a diphtheritic neurologic complication. It fits confirmed cases where the nerve disorder is linked to active or recent diphtheria. Code the condition only when the relationship is clearly stated or supported by the record.
Do not use for
Do not use this code for neuropathy from other infections, toxins, or metabolic causes. If diphtheria is not documented as the cause, check documentation.
Coding tip
Verify that both diphtheria and the nerve complication are documented before assigning A36.83.