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M21.0

⚠ Non-billable (Header)

Valgus deformity, not elsewhere classified

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 M21.0

  • • metatarsus valgus (Q66.6)
  • • talipes calcaneovalgus (Q66.4-)

❌ 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

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 (5)

M21.00Valgus deformity, not elsewhere classified, unspecified siteM21.02Valgus deformity, not elsewhere classified, elbowM21.05Valgus deformity, not elsewhere classified, hipM21.06Valgus deformity, not elsewhere classified, kneeM21.07Valgus deformity, not elsewhere classified, ankle

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Code Information

CodeM21.0
BillableNo — Header code
ParentM21
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes15 rule(s)
Excludes22 note(s)
Child codes5

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)