I'm billing for a doctor who works in an independent, free-standing urgent care center (POS 20) and I'm not sure which E/M codes I should use. The facility is open 24/7 so it's more like an emergency room. Do I have to use the usual office visit codes? If so, will I need to track each patient's visit and then bill the established patient codes if he/she comes back within the three-year period?
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