Medicare Drug List Changes: A Guide to Part D Formularies
One of the most frustrating aspects of Medicare is the annual change to Prescription Drug (Part D) formularies. A medication that was fully covered last year might suddenly cost you significantly more. Understanding how and why these changes happen is crucial for managing your healthcare costs.
What is a Formulary?
A formulary is a list of prescription drugs covered by a specific Medicare Part D or Medicare Advantage plan. Formularies are divided into "tiers," which determine your copay or coinsurance. Generally, Tier 1 includes low-cost generic drugs, while higher tiers include expensive brand-name and specialty medications.
How Formularies Change Each Year
Insurance companies review and update their formularies annually. They may add new drugs, remove existing ones, or change a drug's tier. For example, if a generic version of a brand-name drug becomes available, the plan may move the brand-name drug to a higher, more expensive tier or remove it entirely.
Transition Fill Rules
If your plan removes a drug you are currently taking from its formulary, Medicare requires the plan to provide a temporary "transition fill" (usually a 30-day supply) during the first 90 days of the new plan year. This gives you time to work with your doctor to find an alternative medication or request a formulary exception.
Requesting a Formulary Exception
If you and your doctor believe you must continue taking a drug that is no longer covered or has been moved to a more expensive tier, you can file a formal request for a formulary exception. Your doctor will need to provide a supporting statement explaining why the drug is medically necessary.
How This Affects New Jersey Seniors
With prescription drug prices constantly fluctuating, New Jersey seniors must be proactive. Failing to review your Part D plan during the Annual Enrollment Period can result in hundreds or even thousands of dollars in unexpected out-of-pocket costs.
Talk to a Local NJ Medicare Advisor
Our team at Senior Health Stop offers free, comprehensive drug list comparisons. We run your specific medications through our software to find the plan in Gloucester County that offers the lowest total annual cost for your needs.
We do not offer every plan available in your area. Currently we represent 10 organizations which offer 52 products in your area. Please contact Medicare.gov, 1-800-MEDICARE, or your local State Health Insurance Program (SHIP) to get information on all of your options.
Frequently Asked Questions
When can I change my Part D plan?
You can change your Part D plan during the Annual Enrollment Period, which runs from October 15 to December 7 each year. Your new coverage will begin on January 1.
What happens if I enter the coverage gap (donut hole)?
The coverage gap, or "donut hole," is a temporary limit on what your drug plan will cover. In 2026, the structure of the Part D benefit has changed significantly to cap out-of-pocket costs, effectively eliminating the traditional donut hole phase. We can explain exactly how these new limits protect you.
Are all pharmacies in my plan's network?
No. Most plans have preferred and standard pharmacies. Using a preferred pharmacy will usually result in lower copays. We always check to ensure your local pharmacy is in-network before recommending a plan.