M91.12 vs M96
M91.12 (Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg) compared with M96 (Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified), 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. M91.12 carries an Excludes1 note covering M96: “postprocedural chondropathies (M96.-)”
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
| M91.12Juvenile osteochondrosis of head of femur [Legg-Calvé-Perthes], left leg | M96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified | |
|---|---|---|
| Billing status | Billable | 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], left leg is a billable ICD-10-CM diagnosis code (M91.12). | Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified is a non-billable ICD-10-CM category code (M96). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources