{"code":"M91.1","type":"code","title":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes]","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["slipped upper femoral epiphysis (nontraumatic) (M93.0-)","postprocedural chondropathies (M96.-)"],"excludes2":[],"isBillable":false,"fyEffectivity":{"fy2026":true,"fy2027":true,"billableFy2026":false,"billableFy2027":false},"sibling_codes":["M91.10","M91.11","M91.12"],"inclusionTerms":[],"sibling_titles":{"code":"M91.12","title":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] is a non-billable ICD-10-CM category code (M91.1). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): slipped upper femoral epiphysis (nontraumatic) (M93.0-); postprocedural chondropathies (M96.-).","officialDefinition":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] is a non-billable ICD-10-CM category code (M91.1). A more specific billable subcode must be selected for claims submission. Excludes1 (not coded here): slipped upper femoral epiphysis (nontraumatic) (M93.0-); postprocedural chondropathies (M96.-).","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":""}