Version 2024

2024 ICD-10-CM Diagnosis Code M20

Acquired deformities of fingers and toes

ICD-10-CM Code:
M20
ICD-10 Code for:
Acquired deformities of fingers and toes
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)
      • Acquired deformities of fingers and toes
        (M20)

M20 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of acquired deformities of fingers and toes. 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 Acquired deformities of fingers and toes

Non-specific codes like M20 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 acquired deformities of fingers and toes:

  • M20.0 for Deformity of finger(s) - NON-BILLABLE CODE

  • M20.00 for Unspecified deformity of finger(s) - NON-BILLABLE CODE

  • M20.01 for Mallet finger - NON-BILLABLE CODE

  • M20.02 for Boutonniere deformity - NON-BILLABLE CODE

  • M20.03 for Swan-neck deformity - NON-BILLABLE CODE

  • M20.09 for Other deformity of finger(s) - NON-BILLABLE CODE

  • M20.1 for Hallux valgus (acquired) - NON-BILLABLE CODE

  • Use M20.10 for Hallux valgus (acquired), unspecified foot - BILLABLE CODE

  • Use M20.11 for Hallux valgus (acquired), right foot - BILLABLE CODE

  • Use M20.12 for Hallux valgus (acquired), left foot - BILLABLE CODE

  • M20.2 for Hallux rigidus - NON-BILLABLE CODE

  • Use M20.20 for Hallux rigidus, unspecified foot - BILLABLE CODE

  • Use M20.21 for Hallux rigidus, right foot - BILLABLE CODE

  • Use M20.22 for Hallux rigidus, left foot - BILLABLE CODE

  • M20.3 for Hallux varus (acquired) - NON-BILLABLE CODE

  • Use M20.30 for Hallux varus (acquired), unspecified foot - BILLABLE CODE

  • Use M20.31 for Hallux varus (acquired), right foot - BILLABLE CODE

  • Use M20.32 for Hallux varus (acquired), left foot - BILLABLE CODE

  • M20.4 for Other hammer toe(s) (acquired) - NON-BILLABLE CODE

  • Use M20.40 for Other hammer toe(s) (acquired), unspecified foot - BILLABLE CODE

  • Use M20.41 for Other hammer toe(s) (acquired), right foot - BILLABLE CODE

  • Use M20.42 for Other hammer toe(s) (acquired), left foot - BILLABLE CODE

  • M20.5 for Other deformities of toe(s) (acquired) - NON-BILLABLE CODE

  • M20.5X for Other deformities of toe(s) (acquired) - NON-BILLABLE CODE

  • M20.6 for Acquired deformities of toe(s), unspecified - NON-BILLABLE CODE

  • Use M20.60 for Acquired deformities of toe(s), unspecified, unspecified foot - BILLABLE CODE

  • Use M20.61 for Acquired deformities of toe(s), unspecified, right foot - BILLABLE CODE

  • Use M20.62 for Acquired deformities of toe(s), unspecified, left 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 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • acquired absence of fingers and toes Z89
  • congenital absence of fingers and toes Q71.3 Q72.3
  • congenital deformities and malformations of fingers and toes Q66 Q68 Q70 Q74

Patient Education


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 (broken bones), 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.

[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.