I received a message from the facility that CPT Codes 78803 and 78804 always are billed together. The message from the facility confused me because 78803 is 'SPECT' and 78804 is 'Whole Body, 2 or more days;' also, based on my understanding of the CPT Code Guidelines, these codes are not Add-On Codes, they can be billed separately (if performed on the same date with a modifier, if applicable) and/or individually (if not performed on the same date). Am I understanding the guidelines correctly?