ICD-10-CM Code M21.73

Unequal limb length (acquired), ulna and radius

Version 2020 Non-Billable Code

Not Valid for Submission

M21.73 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of unequal limb length (acquired), ulna and radius. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M21.73
Short Description:Unequal limb length (acquired), ulna and radius
Long Description:Unequal limb length (acquired), ulna and radius

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

  • M21.731 - Unequal limb length (acquired), right ulna
  • M21.732 - Unequal limb length (acquired), left ulna
  • M21.733 - Unequal limb length (acquired), right radius
  • M21.734 - Unequal limb length (acquired), left radius
  • M21.739 - Unequal limb length (acquired), unspecified ulna and radius

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 M21.73 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


Arm Injuries and Disorders

Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.

Types of arm injuries include

  • Tendinitis and bursitis
  • Sprains
  • Dislocations
  • Broken bones
  • Nerve problems
  • Osteoarthritis

You may also have problems or injure specific parts of your arm, such as your hand, wrist, elbow, or shoulder.


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