ICD-10 Code G44.011 – Episodic cluster headache, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.011 – Episodic cluster headache, intractable
What it is
This code identifies episodic cluster headache that is resistant to treatment. It applies when the headache pattern occurs in cluster periods separated by remission, and the episodes are documented as intractable.
Clinical signs
Typical findings include severe unilateral head pain, often around the eye or temple, with autonomic features such as tearing, nasal congestion, or eyelid swelling. Clinical features vary; refer to documentation.
When to use this code
Use G44.011 when the provider documents episodic cluster headache and states it is intractable or refractory. The record should support the episodic pattern and show that usual management has not controlled the attacks. If the note does not clearly state intractability, check documentation.
Do not use for
Do not use this code for migraine, tension-type headache, or cluster headache without an episodic and intractable designation. If the type or severity is unclear, check documentation.
Coding tip
Match the code only when both “episodic” and “intractable” are explicitly documented by the provider.