ICD-10-CM Code M20.01

Mallet finger

Version 2020 Non-Billable Code

Not Valid for Submission

M20.01 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of mallet finger. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M20.01
Short Description:Mallet finger
Long Description:Mallet finger

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

  • M20.011 - Mallet finger of right finger(s)
  • M20.012 - Mallet finger of left finger(s)
  • M20.019 - Mallet finger of unspecified finger(s)

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 M20.01 are found in the index:


Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Other joint disorders (M20-M25)
      • Acquired deformities of fingers and toes (M20)

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


Finger Injuries and Disorders

You use your fingers and thumbs to do everything from grasping objects to playing musical instruments to typing. When there is something wrong with them, it can make life difficult. Common problems include

  • Injuries that result in fractures, ruptured ligaments and dislocations
  • Osteoarthritis - wear-and-tear arthritis. It can also cause deformity.
  • Tendinitis - irritation of the tendons
  • Dupuytren's contracture - a hereditary thickening of the tough tissue that lies just below the skin of your palm. It causes the fingers to stiffen and bend.
  • Trigger finger - an irritation of the sheath that surrounds the flexor tendons. It can cause the tendon to catch and release like a trigger.

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