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M20.0

⚠ Non-billable (Header)

Deformity of finger(s)

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with M20.0

  • • clubbing of fingers (R68.3)
  • • palmar fascial fibromatosis [Dupuytren] (M72.0)
  • • trigger finger (M65.3)

❌ Excludes1

inherited from M20

Rules from parent category M20: Acquired deformities of fingers and toes

  • • 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.-)

Child Codes (5)

M20.00Unspecified deformity of finger(s)M20.01Mallet fingerM20.02Boutonnière deformityM20.03Swan-neck deformityM20.09Other deformity of finger(s)

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Code Information

CodeM20.0
BillableNo — Header code
ParentM20
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes16 rule(s)
Excludes20 note(s)
Child codes5

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)