ICD-10-CM > M00-M99 > M91-M94 > M91 > M91.1 M91.1 Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] Non-Billable/Non-Specific Codes M91.10Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], unspecified legM91.11Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], right legM91.12Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg