Which modifier indicates that the physician was unable to complete a surgical procedure?

Modifier 53 is the correct choice because it specifically indicates that a surgical procedure was started but was discontinued due to extenuating circumstances or the patient's condition. This modifier is used when a procedure cannot be completed due to significant complications that arise during surgery, which prevents the physician from finishing the planned operation effectively.

The use of Modifier 53 is crucial in billing and documentation because it communicates to insurance providers that the service provided was not fully realized, allowing for appropriate reimbursement adjustments. This modifier helps convey the complexity of the situation to payers, indicating that while the surgery was initiated, the factors that necessitated its termination were beyond the control of the physician.

Other modifiers listed serve different purposes. For instance, Modifier 52 indicates a reduced service, usually used when a procedure is performed but without some of the usual components. Modifier 54 refers to surgical care that has been transferred to another provider, and Modifier 55 indicates post-operative management performed by a different physician after the surgical procedure. Understanding these distinctions is essential for proper coding and billing practices.