{"code":"M79.A1","type":"code","title":"Nontraumatic compartment syndrome of upper extremity","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[", if applicable, associated postprocedural complication"],"excludes1":["compartment syndrome NOS (T79.A-)","fibromyalgia (M79.7)","nontraumatic ischemic infarction of muscle (M62.2-)","traumatic compartment syndrome (T79.A-)","psychogenic rheumatism (F45.8)","soft tissue pain, psychogenic (F45.41)"],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["M79.A11","M79.A12","M79.A19"],"inclusionTerms":["Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers"],"sibling_titles":{"code":"M79.A19","title":"Nontraumatic compartment syndrome of unspecified upper extremity","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Nontraumatic compartment syndrome of upper extremity is a non-billable ICD-10-CM category code (M79.A1). A more specific billable subcode must be selected for claims submission. Inclusion terms: Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers. Excludes1 (not coded here): compartment syndrome NOS (T79.A-); fibromyalgia (M79.7); nontraumatic ischemic infarction of muscle (M62.2-); traumatic compartment syndrome (T79.A-); psychogenic rheumatism (F45.","officialDefinition":"Nontraumatic compartment syndrome of upper extremity is a non-billable ICD-10-CM category code (M79.A1). A more specific billable subcode must be selected for claims submission. Inclusion terms: Nontraumatic compartment syndrome of shoulder, arm, forearm, wrist, hand, and fingers. Excludes1 (not coded here): compartment syndrome NOS (T79.A-); fibromyalgia (M79.7); nontraumatic ischemic infarction of muscle (M62.2-); traumatic compartment syndrome (T79.A-); psychogenic rheumatism (F45.8); soft tissue pain, psychogenic (F45.41). Code first: , if applicable, associated postprocedural complication.","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":""}