M21Other acquired deformities of limbs
ICD-10-CM category (non-billable header) code — part of Other joint disorders (M20-M25)
Coding Notes
Excludes1 (never code both together)
- acquired absence of limb (Z89.-)
- congenital absence of limbs (Q71-Q73)
- congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Excludes2 (not part of this condition — may code both)
- acquired deformities of fingers or toes (M20.-)
- coxa plana (M91.2)
Subcategories (10)
- M21.0 Valgus deformity, not elsewhere classified
- M21.1 Varus deformity, not elsewhere classified
- M21.2 Flexion deformity
- M21.3 Wrist or foot drop (acquired)
- M21.4 Flat foot [pes planus] (acquired)
- M21.5 Acquired clawhand, clubhand, clawfoot and clubfoot
- M21.6 Other acquired deformities of foot
- M21.7 Unequal limb length (acquired)
- M21.8 Other specified acquired deformities of limbs
- M21.9 Unspecified acquired deformity of limb and hand