Bunionette

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2017 onwards. It has never been valid for submission on its own.

Submit one of these 3 more specific codes instead:

M21.621 Bunionette of right foot
M21.622 Bunionette of left foot
M21.629 Bunionette of unspecified foot

What has happened to this code

Every change the publisher made, from 2017 to now.

FY2017 Added to the code set Bunionette

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from M21 Other acquired deformities of limbs

Excludes1 - never coded here

acquired absence of limb (Z89.-)
congenital absence of limbs (Q71-Q73)
congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

Excludes2 - not included here

acquired deformities of fingers or toes (M20.-)
coxa plana (M91.2)

Inherited from the M20-M25 section Other joint disorders (M20-M25)

Excludes2 - not included here

joints of the spine (M40-M54)

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Bunionette
Bunion > tailor's

Codes in the same group

Code	Description	Status
M21.61	Bunion	Not billable
M21.6X	Other acquired deformities of foot	Not billable