ICD-10-CM diagnosis code
M20.012 Mallet finger of left finger(s)
- Billable
- Yes, a complete code (FY2026)
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Other codes in M20
33 complete codes in this category.
- M20.001Unspecified deformity of right finger(s)
- M20.002Unspecified deformity of left finger(s)
- M20.009Unspecified deformity of unspecified finger(s)
- M20.011Mallet finger of right finger(s)
- M20.012Mallet finger of left finger(s)
- M20.019Mallet finger of unspecified finger(s)
- M20.021Boutonniere deformity of right finger(s)
- M20.022Boutonniere deformity of left finger(s)
- M20.029Boutonniere deformity of unspecified finger(s)
- M20.031Swan-neck deformity of right finger(s)
- M20.032Swan-neck deformity of left finger(s)
- M20.039Swan-neck deformity of unspecified finger(s)
Documentation tips
- Make sure the note supports every element of the title, “Mallet finger of left finger(s)”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M20.
The international WHO ICD-10 also has M20, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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