ICD-10-CM Code M21.6

Other acquired deformities of foot

Version 2020 Non-Billable Code

Not Valid for Submission

M21.6 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of other acquired deformities of foot. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M21.6
Short Description:Other acquired deformities of foot
Long Description:Other acquired deformities of foot

Consider the following ICD-10 codes with a higher level of specificity:

  • M21.61 - Bunion
  • M21.611 - Bunion of right foot
  • M21.612 - Bunion of left foot
  • M21.619 - Bunion of unspecified foot
  • M21.62 - Bunionette
  • M21.621 - Bunionette of right foot
  • M21.622 - Bunionette of left foot
  • M21.629 - Bunionette of unspecified foot
  • M21.6X - Other acquired deformities of foot
  • M21.6X1 - Other acquired deformities of right foot
  • M21.6X2 - Other acquired deformities of left foot
  • M21.6X9 - Other acquired deformities of unspecified foot

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code M21.6:

Type 2 Excludes

Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other joint disorders (M20-M25)
      • Other acquired deformities of limbs (M21)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Foot Injuries and Disorders

Each of your feet has 26 bones, 33 joints, and more than 100 tendons, muscles, and ligaments. No wonder a lot of things can go wrong. Here are a few common problems:

  • Bunions - hard, painful bumps on the big toe joint
  • Corns and calluses - thickened skin from friction or pressure
  • Plantar warts - warts on the soles of your feet
  • Fallen arches - also called flat feet

Ill-fitting shoes often cause these problems. Aging and being overweight also increase your chances of having foot problems.


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