M21 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Other acquired deformities of limbs.
Type 1 excludes
Acquired absence of limb (Z89.-)
Congenital absence of limbs (Q71-Q73)
Congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Type 2 excludes
Codes
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
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code