M21.1
Non-billableVarus 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.
M00-M99 Diseases of the musculoskeletal system and connective tissue
What this means — in plain language
MedlinePlus · NIHWhat are joints? Your joints are places where two or more bones come together. Your shoulders, elbows, hips, knees, and knuckles are all joints. Your spine has joints, too. But joints are more than bones. They include the soft tissues around them, such as cartilage, tendons and ligaments. Cartilage is the hard slippery flexible tissue that covers the ends of your bones at a joint. Tendons are tough, flexible bands…
Read more about Joint Disorders at MedlinePlus ↗Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.
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.
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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