Question: One of the anesthesiologists we code for wants to bill for controlled hypotension on shoulder and knee procedures. How do we do this? Michigan Subscriber Answer: Some anesthesiologists do administer controlled hypotension during certain procedures at the surgeon's request. You should code with +99135 (Anesthesia complicated by utilization of controlled hypotension [List separately in addition to code for primary anesthesia procedure]). Be sure to include the correct anesthesia code representing the surgery itself because +99135 is an add-on code. The anesthesiologist should document in the anesthesia record that the hypotension was at the surgeon's request. Payment: Definition: