{"code":"I66.0","type":"code","title":"Occlusion and stenosis of middle cerebral artery","codeAlso":[],"includes":["embolism of cerebral artery","narrowing of cerebral artery","obstruction (complete) (partial) of cerebral artery","thrombosis of cerebral artery"],"modern_v":"official26","codeFirst":[],"excludes1":["Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)","traumatic intracranial hemorrhage (S06.-)"],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["I66.01","I66.02","I66.03","I66.09"],"inclusionTerms":[],"sibling_titles":{"code":"I66.09","title":"Occlusion and stenosis of unspecified middle cerebral artery","isBillable":true},"useAdditionalCode":["code to identify presence of:","alcohol abuse and dependence (F10.-)","exposure to environmental tobacco smoke (Z77.22)","history of tobacco dependence (Z87.891)","hypertension (I10-I1A)","occupational exposure to environmental tobacco smoke (Z57.31)","tobacco dependence (F17.-)","tobacco use (Z72.0)"],"clinicalDefinition":"Occlusion and stenosis of middle cerebral artery is a non-billable ICD-10-CM category code (I66.0). A more specific billable subcode must be selected for claims submission. Includes: embolism of cerebral artery; narrowing of cerebral artery; obstruction (complete) (partial) of cerebral artery; thrombosis of cerebral artery. Excludes1 (not coded here): Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5); traumatic intracranial hemorrhage (S06.-).","officialDefinition":"Occlusion and stenosis of middle cerebral artery is a non-billable ICD-10-CM category code (I66.0). A more specific billable subcode must be selected for claims submission. Includes: embolism of cerebral artery; narrowing of cerebral artery; obstruction (complete) (partial) of cerebral artery; thrombosis of cerebral artery. Excludes1 (not coded here): Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5); traumatic intracranial hemorrhage (S06.-). Use additional code: code to identify presence of:; alcohol abuse and dependence (F10.-); exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); hypertension (I10-I1A); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0).","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":""}