G44: Other headache syndromes


In outpatient care, the ICD code on medical documents is always appended with a diagnostic confidence indicator (A, G, V or Z): A (excluded diagnosis), G (confirmed diagnosis), V (tentative diagnosis) and Z (condition after a confirmed diagnosis).


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Cluster headaches

Cluster headaches come in phases, or “clusters”. They involve severe pain, always on one side only and mostly around the temples or eyes.