{"code":"G21.1","type":"code","title":"Other drug-induced secondary parkinsonism","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["Huntington's disease (G10)","neurocognitive disorder with Lewy bodies (G31.83)","Shy-Drager syndrome (G90.3)","syphilitic Parkinsonism (A52.19)"],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"inclusionTerms":[],"useAdditionalCode":[],"clinicalDefinition":"Other drug-induced secondary parkinsonism is a non-billable ICD-10-CM category code (G21.1). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): Huntington's disease (G10); neurocognitive disorder with Lewy bodies (G31.83); Shy-Drager syndrome (G90.3); syphilitic Parkinsonism (A52.19).","officialDefinition":"Other drug-induced secondary parkinsonism is a non-billable ICD-10-CM category code (G21.1). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): Huntington's disease (G10); neurocognitive disorder with Lewy bodies (G31.83); Shy-Drager syndrome (G90.3); syphilitic Parkinsonism (A52.19).","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":"","hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}