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PAR stands for Participating Provider (medical billing). Suggest new definition. This definition appears very frequently and is found in the following Acronym Finder categories: 1  Science, medicine, engineering, etc.2  Business, finance, etc.AR stands for Participating Provider (medical billing). Suggest new definition. This definition appears very frequently and is found in the following Acronym Finder categories: 1  Science, medicine, engineering, etc. 2  Business, finance, etc.
I'll expand on that a bit. PRN stands for Pro Re Nata, which is Latin literally meaning For the thing born.. In medicine, it means As needed or As the situation arises. It means that using the drug is up to the caregiver or the patient as the need warrants.For pain drugs, acute pain meds like Vicodin or Percocet are PRN-type drugs.n medicine, it means As needed or As the situation arises. It means that using the drug is up to the caregiver or the patient as the need warrants. For pain drugs, acute pain meds like Vicodin or Percocet are PRN-type drugs.