A formulary is the list of drugs your health plan agrees to cover, sorted into cost tiers. Plans revise that list every year, and Medicare Part D plans mail an Annual Notice of Change by September 30 that shows which drugs move to a higher tier, gain restrictions, or disappear for 2027. Marketplace insurers send similar renewal notices in the fall. Some plans also remove drugs in the middle of the year, usually after a generic or biosimilar launches or a manufacturer changes its price. When your drug is the one that disappears, the first pharmacy visit can end with a rejected claim and a cash price in the hundreds or thousands of dollars. Your drug is rarely lost for good. Federal rules for Medicare Part D under cms.gov and for Marketplace plans under healthcare.gov give you a formulary exception process with fixed decision times, a written appeal path if the plan says no, and a chance to change plans at open enrollment. The order in which you use those tools matters, and the 2026 calendar puts both major switching windows within the next 30 days.
Most people who lose a drug to a formulary change fall into one of three groups: Medicare beneficiaries with a Part D or Medicare Advantage drug plan, Marketplace enrollees with a subsidized individual plan, and workers on employer or COBRA coverage. Each group has a different clock and a different appeal path, which this page separates step by step. For the Medicare version of the paperwork, read how to file a Medicare Part D formulary exception. To see how the annual calendar fits together, review the open enrollment period glossary entry. If your income is under 138% of the federal poverty level in 2026 ($22,025 for a single adult in the 48 contiguous states and DC), your state Medicaid program may cover the drug on its own preferred drug list at little or no cost, and Medicaid enrollment is open year-round per medicaid.gov. Start with the steps below, in order, and keep every notice you receive.
7 Steps to Get Coverage
Common Mistakes That Cost People Thousands
The most costly mistakes people make after a plan drops a covered drug in 2026:
- Stopping or rationing the drug while waiting for the plan. Ask for a transition supply and keep taking the drug as prescribed.
- Paying cash at the pharmacy without filing an exception. Cash purchases do not count toward your 2026 deductible or Part D out-of-pocket cap in most cases, and they leave no paper trail for an appeal.
- Submitting an exception request without a prescriber statement. Plans reject requests that do not explain why covered alternatives fail.
- Waiting past 65 days to appeal a Part D denial, or 180 days for a Marketplace denial. Late appeals are dismissed unless you show good cause.
- Picking a 2027 plan by premium alone. A $0 premium plan that excludes your drug can cost thousands of dollars more than a plan with a higher premium that covers it.
- Expecting a Marketplace Special Enrollment Period. A formulary change is not a qualifying life event, so plan to switch at Open Enrollment.
Formulary Exceptions and Appeals in 2026: Medicare Part D vs Marketplace
Medicare Part D formulary exceptions follow rules published at cms.gov. Your plan must decide a standard coverage determination within 72 hours and an expedited one within 24 hours after receiving your prescriber's supporting statement. If the plan denies the request, you have 65 days from the date of the notice to ask for a redetermination, which the plan must decide within 7 days (72 hours if expedited) per CMS. A further denial moves to an Independent Review Entity, then to an administrative law judge if the amount in controversy meets the 2026 threshold. Part D plans must also keep a transition policy so that people hit by a negative formulary change can fill a temporary supply, often 30 days, while an exception is pending. Tiering exceptions are not available for drugs on the specialty tier, so the strongest request is a formulary exception for a drug that is entirely removed.
Marketplace plans sold on healthcare.gov follow a parallel process. Under federal rules, an individual plan must offer a standard exception request answered within 72 hours and an expedited request answered within 24 hours, and an external exception review with an independent reviewer if the issuer says no. For a regular denial of coverage, a Marketplace internal appeal must be filed within 180 days of the notice, and an external review request is due within 4 months of the final internal denial. Employer plans, including COBRA, run their own internal appeal under ERISA, and self-insured employer plans follow federal rather than state law. Keep your 1095-A tax form and plan notices together, because switching Marketplace plans mid-year changes the premium tax credit reconciled on your 2026 tax return.
Switching Plans at Open Enrollment for 2027 Coverage
Medicare enrollees can change Part D or Medicare Advantage drug plans during the Annual Election Period, October 15 to December 7, 2026, and the new plan starts January 1, 2027. Medicare Advantage members also get a separate Medicare Advantage Open Enrollment Period from January 1 to March 31, 2027, which lets them switch Advantage plans or return to Original Medicare and add a standalone Part D plan. People who get Extra Help or Medicaid have a monthly Special Enrollment Period to move into a standalone Part D plan. Medicare Plan Finder at medicare.gov lets you enter each drug and your pharmacy and returns the estimated 2027 annual cost, which is the number to compare. KFF's Medicare analysis at kff.org shows that formularies, tiers, and utilization management differ widely among Part D plans, so a drug dropped by one plan is often covered by a competitor.
Marketplace shoppers can change plans from November 1, 2026 through January 15, 2027 in most states, and healthcare.gov guarantees a January 1, 2027 start only if you enroll by December 15, 2026. State exchanges such as Covered California set their own end dates. Enrolling outside that window requires a qualifying life event such as job loss, marriage, a move, or a birth, so a dropped drug alone does not qualify for a Marketplace Special Enrollment Period. COBRA does not escape the problem either, because COBRA continuation uses the same formulary as active employees at 102% of the full premium. Compare Marketplace plans by searching each plan's 2027 drug list for your exact drug, then check its tier, prior authorization, and step therapy rules before you pick.
Medicaid and CHIP Drug Coverage After a Formulary Change in 2026
Medicaid covers outpatient prescription drugs in every state under federal rules at medicaid.gov, and states manage coverage through a preferred drug list with prior authorization. Medicaid eligibility in the 40 expansion states plus DC starts at 138% of the federal poverty level, which is $22,025 for a household of one and $45,540 for a household of four in 2026. State program names vary: California's Medi-Cal (with drugs covered through Medi-Cal Rx), Arizona's AHCCCS, Tennessee's TennCare, Massachusetts's MassHealth, Wisconsin's BadgerCare, and Connecticut's HUSKY Health. Adults who earn too much for Medicaid after a pay raise usually keep subsidies on the Marketplace, and the 400% FPL subsidy cliff returned on January 1, 2026 when the enhanced premium tax credits expired. Children can qualify for CHIP at higher incomes, often 200% to 300% FPL in 2026 depending on the state, with low or no cost for their prescriptions.
Frequently Asked Questions
What is the deadline to switch plans if my drug was dropped in 2026?
Medicare Part D and Medicare Advantage members can switch plans during the Annual Election Period, October 15 to December 7, 2026, with the new plan starting January 1, 2027. Marketplace enrollees can switch from November 1, 2026 to January 15, 2027 in most states, and must enroll by December 15, 2026 for a January 1, 2027 start. A formulary exception request has no deadline and can be filed immediately. Appeals do have deadlines: 65 days for a Medicare Part D denial and 180 days for a Marketplace denial.
What documents do I need to request a formulary exception?
Gather your plan ID card, the formulary change notice or Annual Notice of Change, the pharmacy rejection or claim record, and a supporting statement from your prescriber. The statement should name the drug, the diagnosis, the covered alternatives you tried or cannot take, and the harm expected from switching. Add your medication history and lab results when relevant. For an appeal, keep the plan's written denial and its date, since the 65-day Part D and 180-day Marketplace clocks both start from that notice.
What happens if I miss the open enrollment window?
Plan to stay in your current plan's formulary until the next open enrollment. A formulary change is not a qualifying life event, so no Marketplace Special Enrollment Period opens automatically. You can still file a formulary exception, appeal a denial, use a manufacturer assistance program, or apply for Medicaid, which is open year-round. Medicare Advantage members get one more chance from January 1 to March 31, 2027, when they can switch Advantage plans or return to Original Medicare and add a standalone Part D plan.
Can I get coverage or reimbursement for a drug I already paid for?
Sometimes. If the plan approves a formulary exception, ask whether it applies to fills already paid and request reimbursement with your pharmacy receipts. Medicare Part D plans must pay for an approved exception, and an approval can be effective for the rest of the plan year. Marketplace plans decide case by case. Cash purchases made without filing a claim or exception are the hardest to recover, so ask for the transition supply and file the exception before you pay out of pocket.
Is COBRA a better choice than the Marketplace when my employer plan drops my drug?
Usually no. COBRA continues the same employer plan at 102% of the full 2026 premium, typically $400 to $900 per month for one person, and it uses the same formulary as active employees, so the dropped drug stays dropped. COBRA has a 60-day election window after the qualifying event. A Marketplace plan with 2026 premium tax credits can be cheaper and may include your drug, but verify the plan's drug list for 2027 before you enroll.
What state rules apply when my drug is dropped?
Federal exception and appeal timelines apply in every state, but state details differ. State Medicaid programs set their own preferred drug lists, such as Medi-Cal Rx in California, TennCare in Tennessee, and MassHealth in Massachusetts. Many states also regulate step therapy and require insurers to offer exceptions on fully insured plans, while self-insured employer plans follow federal ERISA rules. Call your state department of insurance or Medicaid agency to learn which protections cover your specific plan.
What happens to my child's prescription coverage if the plan drops it?
Your child can request the same formulary exception on a Marketplace or employer plan, and your prescriber's statement should explain why alternatives are unsafe for a growing child. If your household income is too high for Medicaid, your child may qualify for CHIP, which covers prescriptions at little or no cost in all 50 states and DC, often up to 200% to 300% FPL in 2026. CHIP and Medicaid enrollment is open year-round at healthcare.gov or your state agency.
