Version 2024

2024 ICD-10-CM Diagnosis Code M21.6

Other acquired deformities of foot

ICD-10-CM Code:
M21.6
ICD-10 Code for:
Other acquired deformities of foot
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

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

M21.6 is a non-specific and non-billable diagnosis 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 specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Other acquired deformities of foot

Non-specific codes like M21.6 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other acquired deformities of foot:

  • M21.61 for Bunion - NON-BILLABLE CODE

  • Use M21.611 for Bunion of right foot - BILLABLE CODE

  • Use M21.612 for Bunion of left foot - BILLABLE CODE

  • Use M21.619 for Bunion of unspecified foot - BILLABLE CODE

  • M21.62 for Bunionette - NON-BILLABLE CODE

  • Use M21.621 for Bunionette of right foot - BILLABLE CODE

  • Use M21.622 for Bunionette of left foot - BILLABLE CODE

  • Use M21.629 for Bunionette of unspecified foot - BILLABLE CODE

  • M21.6X for Other acquired deformities of foot - NON-BILLABLE CODE

  • Use M21.6X1 for Other acquired deformities of right foot - BILLABLE CODE

  • Use M21.6X2 for Other acquired deformities of left foot - BILLABLE CODE

  • Use M21.6X9 for Other acquired deformities of unspecified foot - BILLABLE CODE

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


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.

Patient Education


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.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.