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M21.86

⚠ Non-billable (Header)

Other specified acquired deformities of lower leg

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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⚠️ Excludes2

inherited from M21.8

Rules from parent category M21.8: Other specified acquired deformities of limbs

  • • coxa plana (M91.2)

Child Codes (3)

M21.861Other specified acquired deformities of right lower legM21.862Other specified acquired deformities of left lower legM21.869Other specified acquired deformities of unspecified lower leg

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Code Information

CodeM21.86
BillableNo — Header code
ParentM21.8
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes10 rule(s)
Excludes21 note(s)
Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)