ICD-10-CM › M00-M99 › M20-M25 › M codes › M21

M21

Other acquired deformities of limbs

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, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 10 more specific codes instead:

  • M21.0 Valgus deformity, not elsewhere classified (also a header)
  • M21.1 Varus deformity, not elsewhere classified (also a header)
  • M21.2 Flexion deformity (also a header)
  • M21.3 Wrist or foot drop (acquired) (also a header)
  • M21.4 Flat foot [pes planus] (acquired) (also a header)
  • M21.5 Acquired clawhand, clubhand, clawfoot and clubfoot (also a header)
  • M21.6 Other acquired deformities of foot (also a header)
  • M21.7 Unequal limb length (acquired) (also a header)
  • M21.8 Other specified acquired deformities of limbs (also a header)
  • M21.9 Unspecified acquired deformity of limb and hand (also a header)

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

  1. FY2012 Added to the draft code set draft Other acquired deformities of limbs

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.

This code

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)