Question: North Dakota Subscriber Answer: If a professional component of a previous procedure is billed in a three year period, such as when a lab interpretation is billed and no E/M service is performed, then the patient remains a new patient for the initial visit, according to the Medicare Claims Processing Manual. For instance, interpreting a diagnostic test or reading an x-ray or an electrocardiogram (EKG) in the absence of an E/M service or other face-to-face service with the patient does not affect the new patient designation. If you are using the same tax ID number, the established patients are still established, and you should use 99212-99215 (Office or other outpatient visit for the evaluation and management of an established patient ...). The new physician could bill for a higher level of care if he is going to have to treat a new problem that would need more details than previously noted in the chart.