Other acquired deformities of limbs (M21)

Browse all the diagnosis codes used for other acquired deformities of limbs (m21). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.

Clinical Information

Bunion - Abnormal swelling of the inner aspect of the first metatarsal head affecting the first METATARSOPHALANGEAL JOINT.

Bunion, Tailor's - Abnormal swelling of the outer aspect of the fifth metatarsal head affecting the fifth METATARSOPHALANGEAL JOINT.

Leg Length Inequality - A condition in which one of a pair of legs fails to grow as long as the other, which could result from injury or surgery.

Metatarsophalangeal Joint - The articulation between a metatarsal bone (METATARSAL BONES) and a phalanx.

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • acquired absence of limb Z89
  • congenital absence of limbs Q71 Q73
  • congenital deformities and malformations of limbs Q65 Q66 Q68 Q74

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • acquired deformities of fingers or toes M20
  • coxa plana M91.2
  • Diseases of the musculoskeletal system and connective tissue (M00–M99)

    • Other joint disorders (M20-M25)

        • Other acquired deformities of limbs (M21)

        • M21 Other acquired deformities of limbs
        • 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