M20.31: Hallux varus (acquired), right foot
M20.31 is the billable ICD-10-CM diagnosis code for Hallux varus (acquired), right foot. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code M20.31?
M20.31 is the ICD-10-CM diagnosis code for Hallux varus (acquired), right foot. It belongs to category M20 (Acquired deformities of fingers and toes).
Is M20.31 a billable code?
Yes. M20.31 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does M20.31 belong to?
M20.31 is part of ICD-10-CM category M20 — Acquired deformities of fingers and toes, which has 66 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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