ICD-10-CM Code M21.6X

Other acquired deformities of foot

Version 2020 Non-Billable Code

Not Valid for Submission

M21.6X 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:M21.6X
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:

  • M21.6X1 - Other acquired deformities of right foot
  • M21.6X2 - Other acquired deformities of left foot
  • M21.6X9 - Other acquired deformities of unspecified foot

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code M21.6X are found in the index:


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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