{"code":"G71.19","type":"code","title":"Other specified myotonic disorders","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":[],"excludes2":["arthrogryposis multiplex congenita (Q74.3)","metabolic disorders (E70-E88)","myositis (M60.-)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"inclusionTerms":["Myotonia fluctuans","Myotonia permanens","Neuromyotonia [Isaacs]","Paramyotonia congenita (of von Eulenburg)","Pseudomyotonia","Symptomatic myotonia"],"useAdditionalCode":[],"clinicalDefinition":"Other specified myotonic disorders is a billable ICD-10-CM diagnosis code (G71.19). Inclusion terms: Myotonia fluctuans; Myotonia permanens; Neuromyotonia [Isaacs]; Paramyotonia congenita (of von Eulenburg); Pseudomyotonia; Symptomatic myotonia. Excludes2 (not included here): arthrogryposis multiplex congenita (Q74.3); metabolic disorders (E70-E88); myositis (M60.-).","officialDefinition":"Other specified myotonic disorders is a billable ICD-10-CM diagnosis code (G71.19). Inclusion terms: Myotonia fluctuans; Myotonia permanens; Neuromyotonia [Isaacs]; Paramyotonia congenita (of von Eulenburg); Pseudomyotonia; Symptomatic myotonia. Excludes2 (not included here): arthrogryposis multiplex congenita (Q74.3); metabolic disorders (E70-E88); myositis (M60.-).","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":{"arthrogryposis multiplex congenita (Q74.3)":"G71","metabolic disorders (E70-E88)":"G71","myositis (M60.-)":"G71"},"hcc":{"mapped":false,"model":"CMS-HCC V28","paymentYear":"2026","categories":[],"otherModels":[]}}