Wiki allergic reaction to mosquito bite

Brenda1973

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Please advise me and read provider assessment below and my thoughts on the diagnosis coding:
Assessment
- Symptoms are consistent with allergic reaction to mosquito bites.
1. Insect bite of right forearm, initial encounter
2. Urticaria
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I am confused as to if the "S" code is applied primary or if the Allergic Urticaria is applied primary. I can't find the guidelines on insect bites with a reaction.
My thoughts:
1) S50.861A, L50.0, W57.XXXA
2) L50.0, S50.861A, W57.XXXA
 
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