No, he cannot use the 45384 if he does not use the "hot" biopsy method. Your doctor must state "hot" biopsy. If they do not and they only state biopsy then it is a 45380. If they did not do a hot biopsy and they want it coded as such then it is fraud.
On the EGD/Jejunum subject, no, you can't code both. You would only code the 44360, "small intestinal endoscopy, enteroscopy beyond second portion of duodenum, not including ileum; diagnostic, with or without collection of specimen(s) by brushing or washing (separate procedure)".
That code includes the upper GI tract of the esophagus, stomach and duodenum.