{"code":"G44.0","type":"code","title":"Cluster headaches and other trigeminal autonomic cephalgias (TAC)","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":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["G44.001","G44.009","G44.011","G44.019","G44.021","G44.029","G44.031","G44.039","G44.041","G44.049","G44.051","G44.059","G44.091","G44.099"],"inclusionTerms":[],"sibling_titles":{"code":"G44.099","title":"Other trigeminal autonomic cephalgias (TAC), not intractable","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Cluster headaches and other trigeminal autonomic cephalgias (TAC) is a non-billable ICD-10-CM category code (G44.0). A more specific billable subcode must be selected for claims submission. 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 headaches and other trigeminal autonomic cephalgias (TAC) is a non-billable ICD-10-CM category code (G44.0). A more specific billable subcode must be selected for claims submission. 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":""}