Final answer:
Mr. Zachow should request a formulary exception through his plan, which allows him or his physician to fill out a standardized request form from the plan's website and submit it for coverage of the medication that works for him.
Step-by-step explanation:
Mr. Zachow has encountered a common issue where his needs are not fully covered by his current Part D plan's formulary. Since he has had allergic reactions to the first two prescribed drugs and only the third one works for him, which is not covered by his plan, there are a few options he could consider. The most immediate solution is for him to request a formulary exception. Mr. Zachow or his physician can find the standardized request form on the plan's website, complete it, and submit it for coverage of the drug. While options such as waiting for the Annual Election Period to switch plans (option 1) or enrolling in a Special Needs Plan (option 2) are available, they may not provide immediate relief. The option to disenroll from the Part D plan and select a new one that covers the drug (option 3) may also pose timing and eligibility challenges.