M21.8
M21.8 — Other specified acquired deformities of limbs
Non-billable headerICD-10-CM
M21.8 is a non-billable header ICD-10-CM code for other specified acquired deformities of limbs. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- coxa plana (M91.2)
Risk adjustment
M21.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead M21.8
5 child codes. Green means billable.
Related codes at this level
Codes that share M21. If M21.8 is not quite right, the correct code is usually one of these.
- M21.0Valgus deformity, not elsewhere classified
- M21.1Varus deformity, not elsewhere classified
- M21.2Flexion deformity
- M21.3Wrist or foot drop (acquired)
- M21.4Flat foot [pes planus] (acquired)
- M21.5Acquired clawhand, clubhand, clawfoot and clubfoot
- M21.6Other acquired deformities of foot
- M21.7Unequal limb length (acquired)
- M21.9Unspecified acquired deformity of limb and hand
Questions about M21.8
- Is M21.8 a billable ICD-10-CM code?
- No. M21.8 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does M21.8 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).