Allergy Injections - I work in an allergy office that gives

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I work in an allergy office that gives hundreds of allergy injections daily. We were told that we cannot give injections during the lunch hours (when no Dr. is present) and bill 95115. We are having to compete with other clinics that give injections during these hours and also on weekends. They have many more physicians that can cover all these times. So after researching, I find on that allergy injections may be given without a Dr. present but you cannot bill 95115 as it is "incident to". Can someone explain "incident to" and also, if we can't bill 95115, what can we bill?