Is M21.5 a billable ICD-10-CM code?

No. M21.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M21.5 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 M21.5?

M21.5 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M21.5 (M21) and apply to it just the same.

M21.5

M21.5 — Acquired clawhand, clubhand, clawfoot and clubfoot

Non-billable headerICD-10-CM

M21.5 is a non-billable header ICD-10-CM code for acquired clawhand, clubhand, clawfoot and clubfoot. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

clubfoot, not specified as acquired (Q66.89)

Excludes1 inherited from the categories above M21.5

These are not written on M21.5, but they bind it: a note on a category applies to every code beneath it. Billing M21.5 with anything listed here is a denial.

Written on M21 — Other acquired deformities of limbs

acquired absence of limb (Z89.-)
congenital absence of limbs (Q71-Q73)
congenital deformities and malformations of limbs (Q65-Q66, Q68-Q74)

Excludes2 inherited from the categories above M21.5

Also inherited, and the opposite of Excludes1: these conditions are not part of M21.5, but a patient can have both, so you may code both.

Written on M21 — Other acquired deformities of limbs

acquired deformities of fingers or toes (M20.-)
coxa plana (M91.2)

Other codes that can never be billed with M21.5

These codes carry an Excludes1 note pointing at M21.5. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M21.5 alone.

M23Internal derangement of knee

Risk adjustment

M21.5 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 history

M21.5 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead M21.5

4 child codes. Green means billable.

Related codes at this level

Codes that share M21. If M21.5 is not quite right, the correct code is usually one of these.

Questions about M21.5

Is M21.5 a billable ICD-10-CM code?: No. M21.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M21.5 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 M21.5?: M21.5 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above M21.5 (M21) and apply to it just the same.