{"code":"G56.4","type":"code","title":"Causalgia of upper limb","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["complex regional pain syndrome I of lower limb (G90.52-)","complex regional pain syndrome I of upper limb (G90.51-)","complex regional pain syndrome II of lower limb (G57.7-)","reflex sympathetic dystrophy of lower limb (G90.52-)","reflex sympathetic dystrophy of upper limb (G90.51-)","current traumatic nerve disorder - see nerve injury by body region","current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region","neuralgia NOS (M79.2)","neuritis NOS (M79.2)","peripheral neuritis in pregnancy (O26.82-)","radiculitis NOS (M54.1-)"],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"inclusionTerms":["Complex regional pain syndrome II of upper limb"],"useAdditionalCode":[],"clinicalDefinition":"Causalgia of upper limb is a non-billable ICD-10-CM category code (G56.4). A more specific billable subcode must be selected for claims submission. Inclusion terms: Complex regional pain syndrome II of upper limb. Excludes1 (not coded here): complex regional pain syndrome I of lower limb (G90.52-); complex regional pain syndrome I of upper limb (G90.51-); complex regional pain syndrome II of lower limb (G57.7-); reflex sympathetic dystrophy of lower limb (G90.","officialDefinition":"Causalgia of upper limb is a non-billable ICD-10-CM category code (G56.4). A more specific billable subcode must be selected for claims submission. Inclusion terms: Complex regional pain syndrome II of upper limb. Excludes1 (not coded here): complex regional pain syndrome I of lower limb (G90.52-); complex regional pain syndrome I of upper limb (G90.51-); complex regional pain syndrome II of lower limb (G57.7-); reflex sympathetic dystrophy of lower limb (G90.52-); reflex sympathetic dystrophy of upper limb (G90.51-); current traumatic nerve disorder - see nerve injury by body region; current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region; neuralgia NOS (M79.2); neuritis NOS (M79.2); peripheral neuritis in pregnancy (O26.82-); radiculitis NOS (M54.1-).","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":""}