L50.0 — Allergic urticaria
L50.0 is a billable, specific ICD-10-CM code for allergic urticaria. It is valid for submission on a claim.
Excludes1 inherited from the categories above L50.0
These are not written on L50.0, but they bind it: a note on a category applies to every code beneath it. Billing L50.0 with anything listed here is a denial.
Other codes that can never be billed with L50.0
These codes carry an Excludes1 note pointing at L50.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading L50.0 alone.
Risk adjustment
L50.0 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.
Medicare coverage
L50.0 is named in 23 Medicare coverage policies — 23 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56558Billing and Coding: Allergy Testing
- A56558Billing and Coding: Allergy Testing
- A56559Billing and Coding: Allergy Skin Testing
- A56559Billing and Coding: Allergy Skin Testing
How L50.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to L50.0.
- Allergy, allergic›urticaria
- Urticaria›allergic
- Urticaria›due to›drugs
- Urticaria›due to›food
- Urticaria›due to›inhalants
Code history
L50.0 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share L50. If L50.0 is not quite right, the correct code is usually one of these.
Questions about L50.0
- Is L50.0 a billable ICD-10-CM code?
- Yes. L50.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does L50.0 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 L50.0?
- L50.0 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 L50.0 (L50) and apply to it just the same.