{"code":"I65.21","type":"code","title":"Occlusion and stenosis of right carotid artery","codeAlso":[],"includes":["embolism of precerebral artery","narrowing of precerebral artery","obstruction (complete) (partial) of precerebral artery","thrombosis of precerebral artery"],"modern_v":"official26","codeFirst":[],"excludes1":["insufficiency, NOS, of precerebral artery (G45.-)","insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)","traumatic intracranial hemorrhage (S06.-)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["I65","I65.0","I65.01","I65.02","I65.03","I65.09","I65.1","I65.2","I65.22","I65.23","I65.29","I65.8","I65.9"],"inclusionTerms":[],"sibling_titles":{"code":"I65.9","title":"Occlusion and stenosis of unspecified precerebral 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 right carotid artery is a billable ICD-10-CM diagnosis code (I65.21). Includes: embolism of precerebral artery; narrowing of precerebral artery; obstruction (complete) (partial) of precerebral artery; thrombosis of precerebral artery. Excludes1 (not coded here): insufficiency, NOS, of precerebral artery (G45.-); insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2); traumatic intracranial hemorrhage (S06.-).","officialDefinition":"Occlusion and stenosis of right carotid artery is a billable ICD-10-CM diagnosis code (I65.21). Includes: embolism of precerebral artery; narrowing of precerebral artery; obstruction (complete) (partial) of precerebral artery; thrombosis of precerebral artery. Excludes1 (not coded here): insufficiency, NOS, of precerebral artery (G45.-); insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2); 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":"","noteProvenance":{"insufficiency, NOS, of precerebral artery (G45.-)":"I65","insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)":"I65","traumatic intracranial hemorrhage (S06.-)":"I65","code to identify presence of:":"I65","alcohol abuse and dependence (F10.-)":"I65","exposure to environmental tobacco smoke (Z77.22)":"I65","history of tobacco dependence (Z87.891)":"I65","hypertension (I10-I1A)":"I65","occupational exposure to environmental tobacco smoke (Z57.31)":"I65","tobacco dependence (F17.-)":"I65","tobacco use (Z72.0)":"I65","embolism of precerebral artery":"I65","narrowing of precerebral artery":"I65","obstruction (complete) (partial) of precerebral artery":"I65","thrombosis of precerebral artery":"I65"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}