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M20

⚠ Non-billable (Header)

Acquired deformities of fingers and toes

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

  • • 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 (7)

M20.0Deformity of finger(s)M20.1Hallux valgus (acquired)M20.2Hallux rigidusM20.3Hallux varus (acquired)M20.4Other hammer toe(s) (acquired)M20.5Other deformities of toe(s) (acquired)M20.6Acquired deformities of toe(s), unspecified

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Code Information

CodeM20
BillableNo — Header code
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes20 note(s)
Child codes7

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)