M91.20 Coxa plana, unspecified hip

Billable ICD-10-CM code, FY2026.

Applies from M91 Juvenile osteochondrosis of hip and pelvis

Excludes1 (never code together)

• slipped upper femoral epiphysis (nontraumatic) (M93.0-)

Applies from M91.2 Coxa plana

Applicable to

• Hip deformity due to previous juvenile osteochondrosis

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 732.1 Juvenile osteochondrosis of hip and pelvis (approximate)

Code annotations containing back-references to M91.20

Back-references to M91.2

• Type 2 Excludes: M21 Other acquired deformities of limbs ("coxa plana (M91.2)")
• Type 2 Excludes: M21.8 Other specified acquired deformities of limbs ("coxa plana (M91.2)")

Back-references to M91

• Type 1 Excludes: M87 Osteonecrosis ("juvenile osteonecrosis (M91-M92)")
• Type 1 Excludes: M87 Osteonecrosis ("osteochondropathies (M90-M93)")

Nearby codes

• M91.1 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]
• M91.10 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], unspecified leg
• M91.11 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], right leg
• M91.12 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes], left leg
• M91.2 Coxa plana
• M91.20 Coxa plana, unspecified hip (this code)
• M91.21 Coxa plana, right hip
• M91.22 Coxa plana, left hip
• M91.3 Pseudocoxalgia
• M91.30 Pseudocoxalgia, unspecified hip
• M91.31 Pseudocoxalgia, right hip