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-)