ICD-10 Code G44.031 – Episodic paroxysmal hemicrania, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.031 – Episodic paroxysmal hemicrania, intractable
What it is
This code identifies episodic paroxysmal hemicrania that is resistant to treatment. It refers to a primary headache disorder with brief, severe attacks on one side of the head.
Clinical signs
Typical features include repeated short-duration unilateral headache attacks, often with autonomic symptoms such as tearing, nasal congestion, or eye redness. Clinical features vary; refer to documentation.
When to use this code
Use G44.031 when the record clearly documents episodic paroxysmal hemicrania and states that it is intractable or poorly controlled. You should also use it when the provider describes persistent attacks despite appropriate management. Check documentation if the note does not clearly distinguish episodic from other headache types.
Do not use for
Do not use this code for other trigeminal autonomic cephalalgias, migraine, or nonspecific headache diagnoses. If “intractable” is not documented, use the nonintractable code or check documentation.
Coding tip
Confirm both the headache subtype and the intractable status in the provider note before assigning G44.031.