| M91 | Juvenile osteochondrosis of hip and pelvis | NON-BILLABLE CODE |
| M91.0 | Juvenile osteochondrosis of pelvis | BILLABLE CODE |
| M91.1 | Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes] | NON-BILLABLE CODE |
| M91.10 | Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], unspecified leg | BILLABLE CODE |
| M91.11 | Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], right leg | BILLABLE CODE |
| M91.12 | Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], left leg | BILLABLE CODE |
| M91.2 | Coxa plana | NON-BILLABLE CODE |
| M91.20 | Coxa plana, unspecified hip | BILLABLE CODE |
| M91.21 | Coxa plana, right hip | BILLABLE CODE |
| M91.22 | Coxa plana, left hip | BILLABLE CODE |
| M91.3 | Pseudocoxalgia | NON-BILLABLE CODE |
| M91.30 | Pseudocoxalgia, unspecified hip | BILLABLE CODE |
| M91.31 | Pseudocoxalgia, right hip | BILLABLE CODE |
| M91.32 | Pseudocoxalgia, left hip | BILLABLE CODE |
| M91.4 | Coxa magna | NON-BILLABLE CODE |
| M91.40 | Coxa magna, unspecified hip | BILLABLE CODE |
| M91.41 | Coxa magna, right hip | BILLABLE CODE |
| M91.42 | Coxa magna, left hip | BILLABLE CODE |
| M91.8 | Other juvenile osteochondrosis of hip and pelvis | NON-BILLABLE CODE |
| M91.80 | Other juvenile osteochondrosis of hip and pelvis, unspecified leg | BILLABLE CODE |
| M91.81 | Other juvenile osteochondrosis of hip and pelvis, right leg | BILLABLE CODE |
| M91.9 | Juvenile osteochondrosis of hip and pelvis, unspecified | NON-BILLABLE CODE |
| M91.90 | Juvenile osteochondrosis of hip and pelvis, unspecified, unspecified leg | BILLABLE CODE |
| M91.91 | Juvenile osteochondrosis of hip and pelvis, unspecified, right leg | BILLABLE CODE |
| M91.92 | Juvenile osteochondrosis of hip and pelvis, unspecified, left leg | BILLABLE CODE |
