All ICD10 Codes
M20Not billable, use a more specific code below

Acquired deformities of fingers and toes

In Other joint disorders (M20-M25), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

33 billable codes under M20: none are a CC or MCC; none map to an HCC.

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Instructional notes

Excludes1: not coded here, use a different code

  • 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.-)

Also applies, from Other joint disorders (M20-M25)

These notes sit on M20-M25 and apply to every code under it, including M20.

Excludes2: not included here, code separately if applicable

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M20

M20 can't be used on a claim. Pick a billable code below; grey headings group them.

M20 MS-DRGs

As the principal diagnosis, all 33 billable codes under M20 group to MS-DRG 564, 565, or 566 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to M20

Notes on these codes point to M20.

  • M21 Excludes2: acquired deformities of fingers or toes (M20.-)
  • M24.5 Excludes2: acquired deformities of limbs (M20-M21)
  • M25 Excludes2: acquired deformities of limb (M20-M21)
  • M95 Excludes2: acquired deformities of limbs (M20-M21)
  • Z89 Excludes1: acquired deformities of limbs (M20-M21)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

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:

Read more about finger injuries and disorders on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.