Medical Billing and Revenue Codes Not all medical billing is generated from physician’s services. Sometimes services are rendered to patients and the medical billing created from those procedures need to be submitted to the various insurance carriers, but they also need three things: a price, a procedure code, and a revenue code. Revenue codes indicate to the type of service that you are billing for; revenue codes are 3-digit codes, and those revenue codes must match up with specific procedure codes to designate what services were rendered. For instance, if you are using a 360 revenue code, you’re stating that the services rendered were performed in the operating room, and …