M91.1 vs M93.0
M91.1 (Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes]) compared with M93.0 (Slipped upper femoral epiphysis (nontraumatic)), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. M91.1 carries an Excludes1 note covering M93.0: “slipped upper femoral epiphysis (nontraumatic) (M93.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| M91.1Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] | M93.0Slipped upper femoral epiphysis (nontraumatic) | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) | M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99) |
| Definition | Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes] is a non-billable ICD-10-CM category code (M91.1). | Slipped upper femoral epiphysis (nontraumatic) is a non-billable ICD-10-CM category code (M93.0). |
| Includes | — | Slipped capital femoral epiphysis (SCFE) Slipped upper femoral epiphysis (SUFE) |
| Use additional code | — | code for associated chondrolysis (M94.3) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources