ICD-10-CM 2027 diagnosis code
M21.61Bunion
M21.61 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Looking up by condition? See ICD-10 code for Bunion.
Code last changed in FY2017 (effective October 1, 2016). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M21.61
M21.61 is the ICD-10-CM diagnosis code for Bunion. It belongs to category M21 (other acquired deformities of limbs), block M20-M25 (other joint disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
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.
Specific codes under M21.61
Notes that apply from higher levels
Instructions written at a parent level also apply to M21.61.
Broader instructions also apply from M20-M25 Other joint disorders and Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to M21.61.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2017 (effective 10/1/2016): Added
- No changes since FY2017.
Common questions about M21.61
Is M21.61 billable?
- No. M21.61 is a header code. Report one of its more specific subcodes instead.