{"code":"M79.A21","type":"code","title":"Nontraumatic compartment syndrome of right lower 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":true,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":true,"billableFy2027":true},"inclusionTerms":[],"useAdditionalCode":[],"clinicalDefinition":"Nontraumatic compartment syndrome of right lower extremity is a billable ICD-10-CM diagnosis code (M79.A21). 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.","officialDefinition":"Nontraumatic compartment syndrome of right lower extremity is a billable ICD-10-CM diagnosis code (M79.A21). 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":""}