M21: Other acquired deformities of limbs
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.
| Code | Description | Billable |
|---|---|---|
| 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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