M21.1 vs M92.51
M21.1 (Varus deformity, not elsewhere classified) compared with M92.51 (Juvenile osteochondrosis of proximal tibia), 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. M21.1 carries an Excludes1 note covering M92.51: “tibia vara (M92.51-)”
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
| M21.1Varus deformity, not elsewhere classified | M92.51Juvenile osteochondrosis of proximal tibia | |
|---|---|---|
| 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 | Varus deformity, not elsewhere classified is a non-billable ICD-10-CM category code (M21.1). | Juvenile osteochondrosis of proximal tibia is a non-billable ICD-10-CM category code (M92.51). |
| Includes | — | Blount disease Tibia vara |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources