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M20.1

⚠ Non-billable (Header)

Hallux valgus (acquired)

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

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.-)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • bunion (M21.6-)

Child Codes (3)

M20.10Hallux valgus (acquired), unspecified footM20.11Hallux valgus (acquired), right footM20.12Hallux valgus (acquired), left foot

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Code Information

CodeM20.1
BillableNo — Header code
ParentM20
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes21 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)