ICD-10 Code G44.03 – Episodic paroxysmal hemicrania (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.03 – Episodic paroxysmal hemicrania
What it is
G44.03 identifies episodic paroxysmal hemicrania, a primary headache disorder with repeated short attacks of severe one-sided head pain. The diagnosis is used when the chart specifically documents this condition.
Clinical signs
Attacks are typically unilateral, brief, and frequent, and may include autonomic features such as tearing, nasal congestion, or eyelid changes. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents episodic paroxysmal hemicrania as the confirmed diagnosis. It may also fit when the record describes a recurrent unilateral headache pattern consistent with this disorder and no alternate headache type is stated. Check documentation if the note is nonspecific.
Do not use for
Do not use G44.03 for migraine, cluster headache, or other headache disorders unless the provider clearly documents episodic paroxysmal hemicrania. Avoid assigning it for headache symptoms alone.
Coding tip
Code only when the diagnosis is explicitly named or clearly supported in the assessment.