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M21.6

⚠ Non-billable (Header)

Other acquired deformities of foot

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 M21

Rules from parent category M21: Other acquired deformities of limbs

  • • acquired absence of limb (Z89.-)
  • • congenital absence of limbs (Q71-Q73)
  • • congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • deformities of toe (acquired) (M20.1-M20.6-)

⚠️ Excludes2

inherited from M21

Rules from parent category M21: Other acquired deformities of limbs

  • • acquired deformities of fingers or toes (M20.-)
  • • coxa plana (M91.2)

Child Codes (3)

M21.61BunionM21.62BunionetteM21.6XOther acquired deformities of foot

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Code Information

CodeM21.6
BillableNo — Header code
ParentM21
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes23 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)