Chronic cluster headache, intractable

This code signifies a chronic form of cluster headache, a severe primary headache disorder characterized by recurrent, unilateral pain attacks, often accompanied by ipsilateral autonomic symptoms. "Intractable" indicates that the condition is resistant to standard treatment regimens, posing significant challenges in pain management.

This code is appropriate for patients diagnosed with chronic cluster headache who have failed multiple therapeutic interventions and continue to experience frequent, debilitating attacks. Documentation should clearly state the chronicity of the condition (e.g., attacks occurring for more than one year with pain-free periods of less than three months) and the intractability, detailing failed treatments.

• Ensure documentation explicitly states "chronic" and "intractable" for accurate code assignment.
• Do not confuse with episodic cluster headache (G44.00x, G44.01x) or other headache types.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter, especially for pain management or treatment of the intractable condition.