Is M25.4 a billable ICD-10-CM code?

No. M25.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M25.4 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 M25.4?

M25.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

M25.4

M25.4 — Effusion of joint

Non-billable headerICD-10-CM

M25.4 is a non-billable header ICD-10-CM code for effusion of joint. 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.

hydrarthrosis in yaws (A66.6)
intermittent hydrarthrosis (M12.4-)
other infective (teno)synovitis (M65.1-)

Other codes that can never be billed with M25.4

These codes carry an Excludes1 note pointing at M25.4. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M25.4 alone.

R22Localized swelling, mass and lump of skin and subcutaneous tissue

Risk adjustment

M25.4 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 M25.4

9 child codes. Green means billable.

Related codes at this level

Codes that share M25. If M25.4 is not quite right, the correct code is usually one of these.

Questions about M25.4

Is M25.4 a billable ICD-10-CM code?: No. M25.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M25.4 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 M25.4?: M25.4 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.