{"code":"G44.009","type":"code","title":"Cluster headache syndrome, unspecified, not intractable","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["headache NOS (R51.9)"],"excludes2":["atypical facial pain (G50.1)","headache due to lumbar puncture (G97.1)","migraines (G43.-)","trigeminal neuralgia (G50.0)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["G44","G44.0","G44.001","G44.011","G44.019","G44.021","G44.029","G44.031","G44.039","G44.041","G44.049","G44.051","G44.059","G44.091","G44.099","G44.1","G44.2","G44.201","G44.209","G44.211","G44.219","G44.221","G44.229","G44.3","G44.301","G44.309","G44.311","G44.319","G44.321","G44.329","G44.4","G44.5","G44.8"],"inclusionTerms":["Cluster headache syndrome NOS"],"sibling_titles":{"code":"G44.8","title":"Other specified headache syndromes","isBillable":false},"useAdditionalCode":[],"clinicalDefinition":"Cluster headache syndrome, unspecified, not intractable is a billable ICD-10-CM diagnosis code (G44.009). Inclusion terms: Cluster headache syndrome NOS. Excludes1 (not coded here): headache NOS (R51.9). Excludes2 (not included here): atypical facial pain (G50.1); headache due to lumbar puncture (G97.1); migraines (G43.-); trigeminal neuralgia (G50.0).","officialDefinition":"Cluster headache syndrome, unspecified, not intractable is a billable ICD-10-CM diagnosis code (G44.009). Inclusion terms: Cluster headache syndrome NOS. Excludes1 (not coded here): headache NOS (R51.9). Excludes2 (not included here): atypical facial pain (G50.1); headache due to lumbar puncture (G97.1); migraines (G43.-); trigeminal neuralgia (G50.0).","seventhCharacterInstructions":[],"workflowProtocols":[],"guidelines":{"whenToUse":[],"whenNotToUse":[],"commonBillingMistakes":[],"codeComparisons":[],"documentationChecklist":[]},"domainLandscape":{"summary":"Primary diagnostic domain and clinical landscape evaluation.","keyCategories":[],"diagnosticContinuum":"Progression continuum from acute presentation to resolution."},"children":[],"hierarchy":[],"relatedCodes":[],"relevantCPTCodes":[],"documentationTips":[],"caseStudies":[],"description":"","overview":""}