Is M20.1 a billable ICD-10-CM code?

No. M20.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M20.1 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 M20.1?

M20.1 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 M20.1 (M20) and apply to it just the same.

M20.1

M20.1 — Hallux valgus (acquired)

Non-billable headerICD-10-CM

M20.1 is a non-billable header ICD-10-CM code for hallux valgus (acquired). 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.

bunion (M21.6-)

Excludes1 inherited from the categories above M20.1

These are not written on M20.1, but they bind it: a note on a category applies to every code beneath it. Billing M20.1 with anything listed here is a denial.

Written on M20 — Acquired deformities of fingers and toes

acquired absence of fingers and toes (Z89.-)
congenital absence of fingers and toes (Q71.3-, Q72.3-)
congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-)

Other codes that can never be billed with M20.1

These codes carry an Excludes1 note pointing at M20.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M20.1 alone.

M71Other bursopathies

Risk adjustment

M20.1 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

M20.1 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 M20.1

3 child codes. Green means billable.

Related codes at this level

Codes that share M20. If M20.1 is not quite right, the correct code is usually one of these.

Questions about M20.1

Is M20.1 a billable ICD-10-CM code?: No. M20.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M20.1 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 M20.1?: M20.1 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 M20.1 (M20) and apply to it just the same.