G44.1: Vascular headache, not elsewhere classified

Excludes2

• cluster headache (G44.0)
• complicated headache syndromes (G44.5-)
• drug-induced headache (G44.4-)
• migraine (G43.-)
• other specified headache syndromes (G44.8-)
• post-traumatic headache (G44.3-)
• tension-type headache (G44.2-)