What should Mr. Anderson be told regarding his enrollment form submitted on October 10?

Mr. Anderson should be informed that he must wait until the annual election period begins because enrollment in Medicare Advantage or prescription drug plans typically has specific window periods during which individuals can enroll or make changes to their coverage. If his enrollment form was submitted on October 10, it likely falls outside of these designated times, meaning it cannot be processed until the upcoming annual election period commences. This period is a crucial time when eligible individuals can join, switch, or drop their health plan coverage, which is why the timing of his submission is significant and requires him to wait until the allowed enrollment window opens.