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