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M20.10 — Hallux valgus (acquired), unspecified foot
M20.10
What this code means
Hallux valgus is a bunion: the big toe angles toward the other toes with a bony lump at its base; foot not specified.
Also called: bunion, hallux valgus.
When this code is used
Used for hallux valgus (acquired), unspecified foot.
Where it sits in ICD-10-CM
Code M20.10 belongs to Chapter 13: Diseases of the musculoskeletal system and connective tissue, which covers codes M00–M99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.
Related symptoms
Watch: related videos
Frequently asked questions
What is ICD-10-CM code M20.10?
M20.10 is the ICD-10-CM diagnosis code for “Hallux valgus (acquired), unspecified foot”. Hallux valgus is a bunion: the big toe angles toward the other toes with a bony lump at its base; foot not specified.
When is code M20.10 used?
Used for hallux valgus (acquired), unspecified foot. It belongs to Chapter 13 of ICD-10-CM (Diseases of the musculoskeletal system and connective tissue).
This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.