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ICD-10-CM category

M21: Other acquired deformities of limbs

342 subcodes · 248 billable · Look up any code with the ICD-10 search

Codes under M21 (Other acquired deformities of limbs). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

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

Frequently asked questions

What is ICD-10-CM code M21?

M21 is an ICD-10-CM category covering Other acquired deformities of limbs. It contains 342 more specific diagnosis codes, 248 of which are billable.

Is M21 a billable code?

No — M21 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example M21.0 — Valgus deformity, not elsewhere classified). 248 of the 342 codes under M21 are billable.

What codes fall under M21?

M21 includes M21.0, M21.0, M21.00, M21.00, M21.1, plus 337 more. See the full list with descriptions and billable status above.

More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees

Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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