{"code":"G20.A1","type":"code","title":"Parkinson's disease without dyskinesia, without mention of fluctuations","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"sibling_codes":["G20","G20.A","G20.A2","G20.B","G20.B1","G20.B2","G20.C"],"inclusionTerms":["Parkinson's disease NOS","Parkinson's disease without dyskinesia, without mention of OFF episodes"],"sibling_titles":{"code":"G20.C","title":"Parkinsonism, unspecified","isBillable":true},"useAdditionalCode":["code, if applicable, to identify:","dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)","dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)","dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)","dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)","dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)","mild neurocognitive disorder due to known physiological condition (F06.7-)"],"clinicalDefinition":"Parkinson's disease without dyskinesia, without mention of fluctuations is a billable ICD-10-CM diagnosis code (G20.A1). Inclusion terms: Parkinson's disease NOS; Parkinson's disease without dyskinesia, without mention of OFF episodes. Use additional code: code, if applicable, to identify:; dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4); dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-); dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.","officialDefinition":"Parkinson's disease without dyskinesia, without mention of fluctuations is a billable ICD-10-CM diagnosis code (G20.A1). Inclusion terms: Parkinson's disease NOS; Parkinson's disease without dyskinesia, without mention of OFF episodes. Use additional code: code, if applicable, to identify:; dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4); dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-); dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3); dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2); dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0); mild neurocognitive disorder due to known physiological condition (F06.7-).","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":{"code, if applicable, to identify:":"G20","dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)":"G20","dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)":"G20","dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)":"G20","dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)":"G20","dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)":"G20","mild neurocognitive disorder due to known physiological condition (F06.7-)":"G20","Hemiparkinsonism":"G20","Idiopathic Parkinsonism or Parkinson's disease":"G20","Paralysis agitans":"G20","Primary Parkinsonism or Parkinson's disease":"G20"},"hcc":{"mapped":true,"model":"CMS-HCC V28","paymentYear":"2026","categories":[{"hcc":"199","label":"Parkinson and Other Degenerative Disease of Basal Ganglia","family":"","suppresses":[]}],"otherModels":[{"model":"CMS-HCC V22","hcc":"78"},{"model":"RxHCC V08","hcc":"161"}]}}