Is L24 a billable ICD-10-CM code?

No. L24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does L24 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Dermatitis and eczema (L20-L30).

What cannot be coded together with L24?

L24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

L24

L24 — Irritant contact dermatitis

Non-billable headerICD-10-CM

L24 is a non-billable header ICD-10-CM code for irritant contact dermatitis. 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.

allergy NOS (T78.40)
contact dermatitis NOS (L25.9)
dermatitis NOS (L30.9)

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.

allergic contact dermatitis (L23.-)
dermatitis due to substances taken internally (L27.-)
dermatitis of eyelid (H01.1-)
diaper dermatitis (L22)
eczema of external ear (H60.5-)
perioral dermatitis (L71.0)
radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

Other codes that can never be billed with L24

These codes carry an Excludes1 note pointing at L24. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L24 alone.

L24.AIrritant contact dermatitis due to friction or contact with body fluids
L25Unspecified contact dermatitis

Risk adjustment

L24 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 L24

12 child codes. Green means billable.

Questions about L24

Is L24 a billable ICD-10-CM code?: No. L24 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does L24 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Dermatitis and eczema (L20-L30).
What cannot be coded together with L24?: L24 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.