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M21.1

Non-billable

Varus deformity, not elsewhere classified

M21.1 is the ICD-10-CM code for Varus deformity, not elsewhere classified. It is a non-billable category code — use a more specific child code such as M21.10 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M21
Subcodes
5
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Excludes1 — not coded here

Frequently asked questions

What is ICD-10 code M21.1?
M21.1 is the ICD-10-CM code for "Varus deformity, not elsewhere classified". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M21.1 a billable code?
No — M21.1 is a non-billable header code. Use a more specific child code (such as M21.10) for billing.
What are the subcodes of M21.1?
M21.1 has 5 more specific child codes, including M21.10, M21.12, M21.15.
What is excluded from M21.1?
Excludes1 (not coded here): metatarsus varus (Q66.22-); tibia vara (M92.51-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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