If the POTUS needed an organ transplant, then does the POTUS have priority and would end up as number 1 in the organ wait lists? Or would he be treated like any other person in this matter?
Allocation of deceased donor organs must not be influenced positively or negatively by political influence, national origin, ethnicity, sex, religion, or financial status.
And status as a president is likely defined as political influence.
However, there are two other possible workarounds for this brought up in other parts of this question. this comment mentions the possibility of a direct donation of organs, and another answer shows that since the president can travel easily, they can sign up at more hospitals, increasing their chances of getting an organ.