M21 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other acquired deformities of limbs.
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Acquired absence of limb (Z89.-)
Congenital absence of limbs (Q71-Q73)
Congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Valgus deformity, not elsewhere classified
Varus deformity, not elsewhere classified
Flexion deformity
Wrist or foot drop (acquired)
Flat foot [pes planus] (acquired)
Acquired clawhand, clubhand, clawfoot and clubfoot
Other acquired deformities of foot
Unequal limb length (acquired)
Other specified acquired deformities of limbs
Unspecified acquired deformity of limb and hand
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