ICD-10-CM Code M21.9

Unspecified acquired deformity of limb and hand

Version 2020 Non-Billable Code

Not Valid for Submission

M21.9 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of unspecified acquired deformity of limb and hand. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M21.9
Short Description:Unspecified acquired deformity of limb and hand
Long Description:Unspecified acquired deformity of limb and hand

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

  • M21.90 - Unspecified acquired deformity of unspecified limb
  • M21.92 - Unspecified acquired deformity of upper arm
  • M21.921 - Unspecified acquired deformity of right upper arm
  • M21.922 - Unspecified acquired deformity of left upper arm
  • M21.929 - Unspecified acquired deformity of unspecified upper arm
  • M21.93 - Unspecified acquired deformity of forearm
  • M21.931 - Unspecified acquired deformity of right forearm
  • M21.932 - Unspecified acquired deformity of left forearm
  • M21.939 - Unspecified acquired deformity of unspecified forearm
  • M21.94 - Unspecified acquired deformity of hand
  • M21.941 - Unspecified acquired deformity of hand, right hand
  • M21.942 - Unspecified acquired deformity of hand, left hand
  • M21.949 - Unspecified acquired deformity of hand, unspecified hand
  • M21.95 - Unspecified acquired deformity of thigh
  • M21.951 - Unspecified acquired deformity of right thigh
  • M21.952 - Unspecified acquired deformity of left thigh
  • M21.959 - Unspecified acquired deformity of unspecified thigh
  • M21.96 - Unspecified acquired deformity of lower leg
  • M21.961 - Unspecified acquired deformity of right lower leg
  • M21.962 - Unspecified acquired deformity of left lower leg
  • M21.969 - Unspecified acquired deformity of unspecified lower leg

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.


[Learn More]

Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Hand problems include

  • Carpal tunnel syndrome - compression of a nerve as it goes through the wrist, often making your fingers feel numb
  • Injuries that result in fractures, ruptured ligaments and dislocations
  • Osteoarthritis - wear-and-tear arthritis, which can also cause deformity
  • Tendinitis - irritation of the tendons
  • Disorders and injuries of your fingers and thumb

[Learn More]