ICD-10-CM M21: Other acquired deformities of limbs

ICD-10-CM Diagnosis Code (2025)

Official Description for M21

Other acquired deformities of limbs

Coding Notes & Guidelines for M21

Excludes1: Not Coded Here
  • acquired absence of limb (Z89.-)
  • congenital absence of limbs (Q71-Q73)
  • congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)
Excludes1: Not Coded Here
  • metatarsus valgus (Q66.6)
  • talipes calcaneovalgus (Q66.4-)
Excludes1: Not Coded Here
  • metatarsus varus (Q66.22-)
  • tibia vara (M92.51-)
Excludes1: Not Coded Here

congenital pes planus (Q66.5-)

Excludes1: Not Coded Here

clubfoot, not specified as acquired (Q66.89)

Excludes2: Not Included Here
  • acquired deformities of fingers or toes (M20.-)
  • coxa plana (M91.2)
Excludes2: Not Included Here

deformities of toe (acquired) (M20.1-M20.6-)

Excludes2: Not Included Here

coxa plana (M91.2)

Inclusion Terms

Cubitus valgus

Inclusion Terms
  • Genu valgum
  • Knock knee
Inclusion Terms

Cubitus varus, elbow

Inclusion Terms
  • Bow leg
  • Genu varum

Child Codes (More Specific Codes for M21):

M21.0 - Valgus deformity, not elsewhere classified M21.00 - Valgus deformity, not elsewhere classified, unspecified site M21.02 - Valgus deformity, not elsewhere classified, elbow M21.021 - Valgus deformity, not elsewhere classified, right elbow M21.022 - Valgus deformity, not elsewhere classified, left elbow M21.029 - Valgus deformity, not elsewhere classified, unspecified elbow M21.05 - Valgus deformity, not elsewhere classified, hip M21.051 - Valgus deformity, not elsewhere classified, right hip M21.052 - Valgus deformity, not elsewhere classified, left hip M21.059 - Valgus deformity, not elsewhere classified, unspecified hip M21.06 - Valgus deformity, not elsewhere classified, knee M21.061 - Valgus deformity, not elsewhere classified, right knee M21.062 - Valgus deformity, not elsewhere classified, left knee M21.069 - Valgus deformity, not elsewhere classified, unspecified knee M21.07 - Valgus deformity, not elsewhere classified, ankle M21.071 - Valgus deformity, not elsewhere classified, right ankle M21.072 - Valgus deformity, not elsewhere classified, left ankle M21.079 - Valgus deformity, not elsewhere classified, unspecified ankle M21.1 - Varus deformity, not elsewhere classified M21.10 - Varus deformity, not elsewhere classified, unspecified site M21.12 - Varus deformity, not elsewhere classified, elbow M21.121 - Varus deformity, not elsewhere classified, right elbow M21.122 - Varus deformity, not elsewhere classified, left elbow M21.129 - Varus deformity, not elsewhere classified, unspecified elbow M21.15 - Varus deformity, not elsewhere classified, hip M21.151 - Varus deformity, not elsewhere classified, right hip M21.152 - Varus deformity, not elsewhere classified, left hip M21.159 - Varus deformity, not elsewhere classified, unspecified M21.16 - Varus deformity, not elsewhere classified, knee M21.161 - Varus deformity, not elsewhere classified, right knee M21.162 - Varus deformity, not elsewhere classified, left knee M21.169 - Varus deformity, not elsewhere classified, unspecified knee M21.17 - Varus deformity, not elsewhere classified, ankle M21.171 - Varus deformity, not elsewhere classified, right ankle M21.172 - Varus deformity, not elsewhere classified, left ankle M21.179 - Varus deformity, not elsewhere classified, unspecified ankle M21.2 - Flexion deformity M21.20 - Flexion deformity, unspecified site M21.21 - Flexion deformity, shoulder M21.211 - Flexion deformity, right shoulder M21.212 - Flexion deformity, left shoulder M21.219 - Flexion deformity, unspecified shoulder M21.22 - Flexion deformity, elbow M21.221 - Flexion deformity, right elbow M21.222 - Flexion deformity, left elbow M21.229 - Flexion deformity, unspecified elbow M21.23 - Flexion deformity, wrist M21.231 - Flexion deformity, right wrist M21.232 - Flexion deformity, left wrist M21.239 - Flexion deformity, unspecified wrist M21.24 - Flexion deformity, finger joints M21.241 - Flexion deformity, right finger joints M21.242 - Flexion deformity, left finger joints M21.249 - Flexion deformity, unspecified finger joints M21.25 - Flexion deformity, hip M21.251 - Flexion deformity, right hip M21.252 - Flexion deformity, left hip M21.259 - Flexion deformity, unspecified hip M21.26 - Flexion deformity, knee M21.261 - Flexion deformity, right knee M21.262 - Flexion deformity, left knee M21.269 - Flexion deformity, unspecified knee M21.27 - Flexion deformity, ankle and toes M21.271 - Flexion deformity, right ankle and toes M21.272 - Flexion deformity, left ankle and toes M21.279 - Flexion deformity, unspecified ankle and toes M21.3 - Wrist or foot drop (acquired) M21.33 - Wrist drop (acquired) M21.331 - Wrist drop, right wrist M21.332 - Wrist drop, left wrist M21.339 - Wrist drop, unspecified wrist M21.37 - Foot drop (acquired) M21.371 - Foot drop, right foot M21.372 - Foot drop, left foot M21.379 - Foot drop, unspecified foot M21.4 - Flat foot [pes planus] (acquired) M21.40 - Flat foot [pes planus] (acquired), unspecified foot M21.41 - Flat foot [pes planus] (acquired), right foot M21.42 - Flat foot [pes planus] (acquired), left foot M21.5 - Acquired clawhand, clubhand, clawfoot and clubfoot M21.51 - Acquired clawhand M21.511 - Acquired clawhand, right hand M21.512 - Acquired clawhand, left hand M21.519 - Acquired clawhand, unspecified hand M21.52 - Acquired clubhand M21.521 - Acquired clubhand, right hand M21.522 - Acquired clubhand, left hand M21.529 - Acquired clubhand, unspecified hand M21.53 - Acquired clawfoot M21.531 - Acquired clawfoot, right foot M21.532 - Acquired clawfoot, left foot M21.539 - Acquired clawfoot, unspecified foot M21.54 - Acquired clubfoot M21.541 - Acquired clubfoot, right foot M21.542 - Acquired clubfoot, left foot M21.549 - Acquired clubfoot, unspecified foot M21.6 - Other acquired deformities of foot M21.61 - Bunion M21.611 - Bunion of right foot M21.612 - Bunion of left foot M21.619 - Bunion of unspecified foot M21.62 - Bunionette M21.621 - Bunionette of right foot M21.622 - Bunionette of left foot M21.629 - Bunionette of unspecified foot M21.6X - Other acquired deformities of foot M21.6X1 - Other acquired deformities of right foot M21.6X2 - Other acquired deformities of left foot M21.6X9 - Other acquired deformities of unspecified foot M21.7 - Unequal limb length (acquired) M21.70 - Unequal limb length (acquired), unspecified site M21.72 - Unequal limb length (acquired), humerus M21.721 - Unequal limb length (acquired), right humerus M21.722 - Unequal limb length (acquired), left humerus M21.729 - Unequal limb length (acquired), unspecified humerus M21.73 - Unequal limb length (acquired), ulna and radius M21.731 - Unequal limb length (acquired), right ulna M21.732 - Unequal limb length (acquired), left ulna M21.733 - Unequal limb length (acquired), right radius M21.734 - Unequal limb length (acquired), left radius M21.739 - Unequal limb length (acquired), unspecified ulna and radius M21.75 - Unequal limb length (acquired), femur M21.751 - Unequal limb length (acquired), right femur M21.752 - Unequal limb length (acquired), left femur M21.759 - Unequal limb length (acquired), unspecified femur M21.76 - Unequal limb length (acquired), tibia and fibula M21.761 - Unequal limb length (acquired), right tibia M21.762 - Unequal limb length (acquired), left tibia M21.763 - Unequal limb length (acquired), right fibula M21.764 - Unequal limb length (acquired), left fibula M21.769 - Unequal limb length (acquired), unspecified tibia and fibula M21.8 - Other specified acquired deformities of limbs M21.80 - Other specified acquired deformities of unspecified limb M21.82 - Other specified acquired deformities of upper arm M21.821 - Other specified acquired deformities of right upper arm M21.822 - Other specified acquired deformities of left upper arm M21.829 - Other specified acquired deformities of unspecified upper arm M21.83 - Other specified acquired deformities of forearm M21.831 - Other specified acquired deformities of right forearm M21.832 - Other specified acquired deformities of left forearm M21.839 - Other specified acquired deformities of unspecified forearm M21.85 - Other specified acquired deformities of thigh M21.851 - Other specified acquired deformities of right thigh M21.852 - Other specified acquired deformities of left thigh M21.859 - Other specified acquired deformities of unspecified thigh M21.86 - Other specified acquired deformities of lower leg M21.861 - Other specified acquired deformities of right lower leg M21.862 - Other specified acquired deformities of left lower leg M21.869 - Other specified acquired deformities of unspecified lower leg M21.9 - Unspecified acquired deformity of limb and hand M21.90 - Unspecified acquired deformity of unspecified limb M21.92 - Unspecified acquired deformity of upper arm M21.921 - Unspecified acquired deformity of right upper arm M21.922 - Unspecified acquired deformity of left upper arm M21.929 - Unspecified acquired deformity of unspecified upper arm M21.93 - Unspecified acquired deformity of forearm M21.931 - Unspecified acquired deformity of right forearm M21.932 - Unspecified acquired deformity of left forearm M21.939 - Unspecified acquired deformity of unspecified forearm M21.94 - Unspecified acquired deformity of hand M21.941 - Unspecified acquired deformity of hand, right hand M21.942 - Unspecified acquired deformity of hand, left hand M21.949 - Unspecified acquired deformity of hand, unspecified hand M21.95 - Unspecified acquired deformity of thigh M21.951 - Unspecified acquired deformity of right thigh M21.952 - Unspecified acquired deformity of left thigh M21.959 - Unspecified acquired deformity of unspecified thigh M21.96 - Unspecified acquired deformity of lower leg M21.961 - Unspecified acquired deformity of right lower leg M21.962 - Unspecified acquired deformity of left lower leg M21.969 - Unspecified acquired deformity of unspecified lower leg

About ICD-10-CM Code M21 (Other acquired deformities of limbs)

ICD-10-CM code M21 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM M21 became effective on October 1, 2024.

This page provides detailed information about M21 - Other acquired deformities of limbs. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other acquired deformities of limbs.