L50.1 — Idiopathic urticaria
L50.1 is a billable, specific ICD-10-CM code for idiopathic urticaria. It is valid for submission on a claim.
Risk adjustment
L50.1 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.
Medicare coverage
L50.1 is named in 16 Medicare coverage policies — 16 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52448Billing and Coding: Omalizumab and biosimilar, OMLYCLO® (omalizumab-igec)
- A56558Billing and Coding: Allergy Testing
- A56558Billing and Coding: Allergy Testing
- A56559Billing and Coding: Allergy Skin Testing
How L50.1 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 L50.1.
- Urticaria›idiopathic
- Urticaria›nonallergic
Related codes at this level
Codes that share L50. If L50.1 is not quite right, the correct code is usually one of these.
Questions about L50.1
- Is L50.1 a billable ICD-10-CM code?
- Yes. L50.1 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does L50.1 sit in the tabular list?
- Diseases of the skin and subcutaneous tissue (L00-L99), in the block Urticaria and erythema (L49-L54).