Immunology/allergy treatments often require follow up visits with the physician on the same day, and these must be carefully coded with modifiers to indicate that, or the insurer is likely to consider it a duplicate bill and only pay one of them. Most items on a claim are allotted a specific amount of time, but treatments such as rush immunotherapy and drug desensitization may be billed on an hourly basis. Only experienced billers are likely to be aware of this exception and know how to properly document it. The benefits of outsourcing to Med Billing RES include cost reduction, improved efficiency, and enhanced financial stability for your practice.