Critical Care Codes Documentation Critical care is not only extremely important to save lives, but is also important in medical billing. Only the most experienced medical billers understand how to bill critical care correctly. There are several rules one should keep in mind when doing medical billing for a critical care patient. The two critical care Current procedural terminology codes are 99291 (Critical care, evaluation and management of the critically ill or critically injured patient; first 30-74 minutes) and 99292 ( each additional 30 minutes). Obviously, these codes are only appropriate for medical billing when there is a critically ill or injured patient. However, this can be more difficult to …