Juvenile osteochondrosis of hip and pelvis (M91) ICD-10-CM
The M91 code range covers juvenile osteochondrosis of hip and pelvis with 26 ICD-10-CM diagnosis codes. 19 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- slipped upper femoral epiphysis nontraumatic M93.0
Codes in the M91 Range 26 codes · 19 billable
- M91 Juvenile osteochondrosis of hip and pelvisNon-billable
- M91.0 Juvenile osteochondrosis of pelvis
- M91.1 Juvenile osteochondrosis of head of femur [Legg-Calve-Perthes]Non-billable
- 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 planaNon-billable
- M91.20 Coxa plana, unspecified hip
- M91.21 Coxa plana, right hip
- M91.22 Coxa plana, left hip
- M91.3 PseudocoxalgiaNon-billable
- M91.30 Pseudocoxalgia, unspecified hip
- M91.31 Pseudocoxalgia, right hip
- M91.32 Pseudocoxalgia, left hip
- M91.4 Coxa magnaNon-billable
- M91.40 Coxa magna, unspecified hip
- M91.41 Coxa magna, right hip
- M91.42 Coxa magna, left hip
- M91.8 Other juvenile osteochondrosis of hip and pelvisNon-billable
- M91.80 Other juvenile osteochondrosis of hip and pelvis, unspecified leg
- M91.81 Other juvenile osteochondrosis of hip and pelvis, right leg
- M91.82 Other juvenile osteochondrosis of hip and pelvis, left leg
- M91.9 Juvenile osteochondrosis of hip and pelvis, unspecifiedNon-billable
- M91.90 Juvenile osteochondrosis of hip and pelvis, unspecified, unspecified leg
- M91.91 Juvenile osteochondrosis of hip and pelvis, unspecified, right leg
- M91.92 Juvenile osteochondrosis of hip and pelvis, unspecified, left leg
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the M91 range.
Coxa Magna
Deformity of the hip characterized by enlargement and deformation of the FEMUR HEAD and FEMUR NECK, often with associated changes in the ACETABULUM. These changes may be secondary to other diseases (e.g. LEGG-PERTHES DISEASE; ARTHRITIS; HIP DISLOCATION, CONGENITAL) or TRAUMA.
Legg-Calve-Perthes Disease
A particular type of FEMUR HEAD NECROSIS occurring in children, mainly male, with a course of four years or so.
About the M91 Code Range
These conditions affect the hip or pelvis in young people. The codes separate osteochondrosis of the pelvis from osteochondrosis of the femoral head, the top of the thighbone.
M91.0 identifies pelvic osteochondrosis, while M91.1 identifies osteochondrosis of the femoral head, also called Legg-Calve-Perthes. Coxa plana, pseudocoxalgia, and coxa magna have separate branches. Other forms fall under M91.8, and unspecified forms under M91.9. Most branches distinguish the right, left, or unspecified hip or leg.
Questions About This Page
How many billable codes are in the M91 range?
Of the 26 codes in this range, 19 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the M91 range classify?
The range classifies juvenile osteochondrosis of hip and pelvis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
