CPT® Code 99116

1. Indications

The use of CPT® Code 99116 is indicated in specific clinical scenarios where total body hypothermia is employed during anesthesia. The following conditions or situations warrant the application of this code:

• Cardiac Surgery Total body hypothermia is often utilized in cardiac surgical procedures to protect the heart and other vital organs by reducing metabolic demand.
• Traumatic Brain Injury In cases of traumatic brain injury, hypothermia may be used to mitigate secondary brain damage by lowering the metabolic rate and reducing intracranial pressure.

2. Procedure

The procedural steps associated with the application of total body hypothermia in conjunction with anesthesia are as follows:

• Step 1: Preparation for Hypothermia Prior to the initiation of the surgical procedure, the patient is prepared for total body hypothermia. This involves monitoring the patient's baseline temperature and ensuring that all necessary equipment for cooling is available and functioning properly.
• Step 2: Induction of Anesthesia The primary anesthesia procedure is performed, which may include the administration of general anesthesia or regional anesthesia, depending on the surgical requirements. The anesthesiologist must ensure that the patient is stable and adequately sedated before proceeding with hypothermia.
• Step 3: Initiation of Total Body Hypothermia Total body hypothermia is then initiated, typically through the use of cooling blankets, ice packs, or specialized cooling devices. The goal is to gradually lower the patient's core body temperature to the desired level, which is closely monitored throughout the process.
• Step 4: Maintenance of Hypothermia During the surgical procedure, the patient's temperature is continuously monitored to maintain the target hypothermic state. Adjustments to the cooling methods may be made as necessary to ensure that the temperature remains within the desired range.
• Step 5: Rewarming After the surgical procedure is completed, the patient is gradually rewarmed to normal body temperature. This process must be done carefully to avoid complications associated with rapid rewarming.

3. Post-Procedure

Post-procedure care following the use of total body hypothermia includes careful monitoring of the patient's temperature as they are rewarmed. It is essential to observe for any signs of complications that may arise from hypothermia, such as cardiac arrhythmias or coagulopathy. Additionally, the patient should be assessed for any neurological changes, particularly in cases involving traumatic brain injury. Continuous monitoring of vital signs and metabolic parameters is crucial during the recovery phase to ensure the patient's safety and well-being.