Question: California Subscriber Answer: A bolster -- an external plastic apparatus -- holds the PEG tube in place on the abdominal wall. If you see in your physician's notes the replacement of a PEG tube bolster chances are the tube is functioning adequately but the bolster has become damaged and needs to be replaced. Replacing this device involves the surgeon sliding a new bolster over the G-tube without using an endoscopy to go back into the patient's stomach. You can report an outpatient E/M code (99201-99215).