{"code":"M91.12","type":"code","title":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg","codeAlso":[],"includes":[],"modern_v":"official26","codeFirst":[],"excludes1":["slipped upper femoral epiphysis (nontraumatic) (M93.0-)","postprocedural chondropathies (M96.-)"],"excludes2":[],"isBillable":true,"fyEffectivity":{"fy2026":true,"fy2027":true},"sibling_codes":["M91","M91.0","M91.1","M91.10","M91.11","M91.2","M91.20","M91.21","M91.22","M91.3","M91.30","M91.31","M91.32","M91.4","M91.40","M91.41","M91.42","M91.8","M91.80","M91.81","M91.82","M91.9","M91.90","M91.91","M91.92"],"inclusionTerms":[],"sibling_titles":{"code":"M91.92","title":"Juvenile osteochondrosis of hip and pelvis, unspecified, left leg","isBillable":true},"useAdditionalCode":[],"clinicalDefinition":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg is a billable ICD-10-CM diagnosis code (M91.12). Excludes1 (not coded here): slipped upper femoral epiphysis (nontraumatic) (M93.0-); postprocedural chondropathies (M96.-).","officialDefinition":"Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg is a billable ICD-10-CM diagnosis code (M91.12). 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":""}