Which modifier is applied when a resident provides a service without the presence of a teaching physician?

The correct choice reflects the application of the GE modifier. This modifier is specifically used to indicate that a service was performed by a resident without the presence of a teaching physician. In the context of teaching hospitals, this modifier helps to distinguish services provided by residents when they are not directly supervised by attending physicians.

The use of the GE modifier is important for proper billing and reimbursement practices. It ensures that the payer understands the circumstances under which the service was provided and that it aligns with the policies regarding supervision of residents. When coding for services that involve teaching physicians and residents, accurately applying the GE modifier helps maintain compliance with teaching physician supervision requirements and ensures that claims are processed correctly.

This understanding of modifier application is crucial for anyone involved in cardiovascular and thoracic surgery coding, as it directly impacts the financial integrity of claims submitted for reimbursement.