Question: A patient came to our office for a sleep study at 9 p.m. on Monday; the study ended the next day at 7 a.m. The neurologist wrote the report on a different day. We split the bill between professional and technical components. Since we have three different dates (start, end, and report), what date of service should we assign for the technical and professional bills? Illinois Subscriber Answer: If your neurologist conducts a sleep study overnight, use the initial start date of the procedure as the date of service billed. Explanation: