ICD-10 Code G44.019 – Episodic cluster headache, not intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.019 – Episodic cluster headache, not intractable
What it is
G44.019 identifies episodic cluster headache that is not described as intractable. Use it for a primary headache disorder with cluster-pattern attacks occurring in bouts, when the record does not indicate resistance to treatment.
Clinical signs
Cluster headache typically causes severe unilateral head pain with autonomic features such as tearing, nasal congestion, or eye redness. Attacks often recur in clusters over weeks to months; clinical features vary, refer to documentation.
When to use this code
Use this code when the clinician documents episodic cluster headache and does not state that it is intractable. It fits outpatient, emergency, or specialty notes that identify the diagnosis without describing refractory symptoms. If the record only says “cluster headache,” check documentation.
Do not use for
Do not use this code for intractable cluster headache or for other headache types such as migraine or tension headache. If the episode pattern or subtype is unclear, check documentation before assigning G44.019.
Coding tip
Code the exact documented subtype and intractability status; if either is missing, query the provider.