M21.0
M21.0 — Valgus deformity, not elsewhere classified
Non-billable headerICD-10-CM
M21.0 is a non-billable header ICD-10-CM code for valgus deformity, not elsewhere classified. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with M21.0
These codes carry an Excludes1 note pointing at M21.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M21.0 alone.
- Q66Congenital deformities of feet
Risk adjustment
M21.0 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 M21.0
5 child codes. Green means billable.
Related codes at this level
Codes that share M21. If M21.0 is not quite right, the correct code is usually one of these.
- 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)
- M21.8Other specified acquired deformities of limbs
- M21.9Unspecified acquired deformity of limb and hand
Questions about M21.0
- Is M21.0 a billable ICD-10-CM code?
- No. M21.0 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does M21.0 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Other joint disorders (M20-M25).
- What cannot be coded together with M21.0?
- M21.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.