Is L50 a billable ICD-10-CM code?

No. L50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does L50 sit in the tabular list?

Diseases of the skin and subcutaneous tissue (L00-L99), in the block Urticaria and erythema (L49-L54).

What cannot be coded together with L50?

L50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

L50

L50 — Urticaria

Non-billable headerICD-10-CM

L50 is a non-billable header ICD-10-CM code for urticaria. 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.

allergic contact dermatitis (L23.-)
angioneurotic edema (T78.3)
giant urticaria (T78.3)
hereditary angio-edema (D84.1)
Quincke's edema (T78.3)
serum urticaria (T80.6-)
solar urticaria (L56.3)
urticaria neonatorum (P83.8)
urticaria papulosa (L28.2)
urticaria pigmentosa (D47.01)

Other codes that can never be billed with L50

These codes carry an Excludes1 note pointing at L50. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L50 alone.

L25.5Unspecified contact dermatitis due to plants, except food
L95Vasculitis limited to skin, not elsewhere classified
T78.3Angioneurotic edema
T78.3XXAAngioneurotic edema, initial encounter
T78.3XXDAngioneurotic edema, subsequent encounter
T78.3XXSAngioneurotic edema, sequela

Risk adjustment

L50 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 L50

9 child codes. Green means billable.

Questions about L50

Is L50 a billable ICD-10-CM code?: No. L50 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does L50 sit in the tabular list?: Diseases of the skin and subcutaneous tissue (L00-L99), in the block Urticaria and erythema (L49-L54).
What cannot be coded together with L50?: L50 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.