Dr. notes say: PET scan was performed from base of skull to thighs using attenuation correction technique following intravenous administration of 10.54 mCi if F -18 with imaging performed after quietly resting for 1 hour post injection. Patient's blood glucose at the time of injection was 108mg/dl. CT of neck, chest and abdomen performed for correlation with PET scan. What CPT code should be used? I came up with 78815 but the doctor says it is 78812. Can anyone lend their expertise??