ICD-10-CM 2027
ICD-10 code for Bunion
From the official ICD-10-CM alphabetic index entry “Bunion”. Page updated September 29, 2026.
About coding Bunion
The ICD-10-CM code for Bunion is M21.61 (Bunion). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on M21.61.
Within M21.6 (other acquired deformities of foot), M21.61 is specifically for Bunion. Related codes cover bunionette (M21.62) and other acquired deformities of foot (M21.6X).
To report this condition, pick the subcode that matches the documentation: M21.611 (of right foot), M21.612 (of left foot) and M21.619 (of unspecified foot).
It was added in FY2017, effective October 1, 2016.
More specific Bunion codes (official index)
- tailor's M21.62 — Bunionette
Common questions about Bunion ICD-10 codes
What is the ICD-10 code for Bunion?
- M21.61 — Bunion (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: M21.62.
What is the ICD-10 code for tailor's bunion?
- M21.62 — Bunionette (header code; choose a more specific subcode).
Is M21.61 billable?
- No. M21.61 is a header code. Report one of its more specific subcodes instead.