{"code":"Q21.8","type":"code","title":"Other congenital malformations of cardiac septa","codeAlso":[", if applicable:","Eisenmenger's complex (I27.83)","Eisenmenger's syndrome (I27.83)"],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["acquired cardiac septal defect (I51.0)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["Q21","Q21.0","Q21.1","Q21.2","Q21.3","Q21.4","Q21.9"],"inclusionTerms":["Eisenmenger's defect","Pentalogy of Fallot"],"sibling_titles":{"code":"Q21.9","title":"Congenital malformation of cardiac septum, unspecified","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Other congenital malformations of cardiac septa is a billable ICD-10-CM diagnosis code (Q21.8). Inclusion terms: Eisenmenger's defect; Pentalogy of Fallot. Excludes1 (not coded here): acquired cardiac septal defect (I51.0). Code also: , if applicable:; Eisenmenger's complex (I27.83); Eisenmenger's syndrome (I27.83).","officialDefinition":"Other congenital malformations of cardiac septa is a billable ICD-10-CM diagnosis code (Q21.8). Inclusion terms: Eisenmenger's defect; Pentalogy of Fallot. Excludes1 (not coded here): acquired cardiac septal defect (I51.0). Code also: , if applicable:; Eisenmenger's complex (I27.83); Eisenmenger's syndrome (I27.83).","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":""}