{"code":"G04.90","type":"code","title":"Encephalitis and encephalomyelitis, unspecified","codeAlso":[],"includes":["acute ascending myelitis","meningoencephalitis","meningomyelitis"],"modern_v":"official26","codeFirst":[],"excludes1":["encephalopathy NOS (G93.40)"],"excludes2":["acute transverse myelitis (G37.3)","alcoholic encephalopathy (G31.2)","multiple sclerosis (G35-)","myalgic encephalomyelitis (G93.32)","subacute necrotizing myelitis (G37.4)","toxic encephalitis (G92.8)","toxic encephalopathy (G92.8)"],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"inclusionTerms":["Ventriculitis (cerebral) NOS"],"useAdditionalCode":[],"clinicalDefinition":"Encephalitis and encephalomyelitis, unspecified is a billable ICD-10-CM diagnosis code (G04.90). Includes: acute ascending myelitis; meningoencephalitis; meningomyelitis. Inclusion terms: Ventriculitis (cerebral) NOS. Excludes1 (not coded here): encephalopathy NOS (G93.40). Excludes2 (not included here): acute transverse myelitis (G37.3); alcoholic encephalopathy (G31.2); multiple sclerosis (G35-); myalgic encephalomyelitis (G93.32); subacute necrotizing myelitis (G37.4); toxic encephalitis (G92.8); toxic encephalopathy (G92.8).","officialDefinition":"Encephalitis and encephalomyelitis, unspecified is a billable ICD-10-CM diagnosis code (G04.90). Includes: acute ascending myelitis; meningoencephalitis; meningomyelitis. Inclusion terms: Ventriculitis (cerebral) NOS. Excludes1 (not coded here): encephalopathy NOS (G93.40). Excludes2 (not included here): acute transverse myelitis (G37.3); alcoholic encephalopathy (G31.2); multiple sclerosis (G35-); myalgic encephalomyelitis (G93.32); subacute necrotizing myelitis (G37.4); toxic encephalitis (G92.8); toxic encephalopathy (G92.8).","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":""}