Your 2027 Plan Can Add Prior Authorization to a Drug You’ve Taken for Years. In the New Formulary, That Change Is Two Letters: “PA.”
Your Medicare plan can attach prior authorization to a drug you've taken for years without calling you, and the only warning arrives as two quiet letters in a table most people never read. The 2027 formulary is already taking shape,…
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The Annual Notice of Change arrives in late September. Most people check whether the premium moved, decide it’s close enough, and set the envelope aside. The change that costs money isn’t on the premium line. It’s two letters sitting beside a drug you’ve taken for years, in the formulary that comes with the notice.
PA means prior authorization. QL means quantity limit. ST means step therapy. A plan can keep your drug on its formulary, still technically covered, while attaching one of those effective January 1. The notice tells you coverage is changing. The drug list tells you how.
What Happens on January 1
Say the PA is there, sitting beside your drug in the new formulary. Here’s what your first refill of the year actually looks like. You hand over the prescription you’ve handed over a hundred times. The pharmacist runs it. Because a prior authorization requirement is now attached to that drug, the plan wants your prescriber to justify it before paying, and none of that has happened yet.
This is where the safety net shows up. A plan that adds a prior authorization mid-stream generally has to run a transition process for members already on the drug. That can mean at least one month’s temporary supply, available during the first 90 days of the year, or completing an appropriate transition before January 1. Read those 90 days carefully. They’re your window to obtain the temporary fill, not 90 days of medication. And the process doesn’t reach every member in every circumstance. So you may well walk out in January holding your drug. What you’re holding is a bridge, and it’s shorter than most people assume.
Delay Dilemma
Once a plan receives a complete coverage-determination request, federal deadlines govern how fast it has to decide. The system moves on a clock. The delays happen on either side of that clock. Before it starts, while a prescriber’s office assembles documentation or sends an incomplete request. And after it stops, if the answer is no and you’re into an appeal. Neither of those is the plan sitting on a decision. Both of them are time you spend at the pharmacy counter.
This matters most if you take a brand-name maintenance drug: an anticoagulant like apixaban, a self-administered biologic covered under Part D, a newer inhaler, a GLP-1 covered for a qualifying medical indication. If everything you take is a generic with no flags beside it, the formulary table is a quick check rather than a project.
The Shopping Window
The Annual Election Period runs October 15 through December 7, and it’s the main annual opportunity to change stand-alone Part D or Medicare Advantage coverage for a January 1 start. Advantage members get a second pass from January 1 through March 31, and various special enrollment periods exist for particular circumstances. Do nothing and you’re renewed into the same plan under its 2027 formulary, flags and all.
The move is to run every prescription you take through the Plan Finder at Medicare.gov for the 2027 plan year. It shows tier placement and utilization management flags drug by drug. The same medication can sit on Tier 3 with no restrictions at one plan and Tier 3 with PA and ST at another, at a comparable premium. The flag column is the decision.
Two guardrails survive a new PA requirement, with limits worth knowing. The Part D out-of-pocket cap rises to $2,400 in 2027, which bounds your covered drug spending for the year. It does not cover cash you pay outside the benefit. If a PA is denied and you buy the drug yourself, that money may not count toward the cap unless the claim is later approved and processed.
Higher earners still owe the Part D income surcharge on top of the plan premium, and switching plans doesn’t change it, because it’s set by income from two years back. As a current reference, the 2026 surcharge starts at $14.50 monthly above $109,000 in income for individuals and $218,000 for couples, reaching $91.00 at the top tier. IRMAA is one of several Medicare costs that never appear on a plan comparison page, and we mapped the rest in a free guide to Medicare’s hidden bills.
Look Before You Leap
The whole advantage here belongs to whoever looks first, and right now that can still be you. Here are three steps to help:
- Find the formulary that came with your notice and scan for PA, QL and ST beside every drug you take. Mark anything that wasn’t there last year. That’s your list.
- If a flag is new, call the prescriber’s office in early January rather than waiting for a rejection. Ask them to submit the request before you need the refill. Starting the clock early is the only part of the timeline you control.
- Run your full drug list through the Plan Finder for 2027 while the window is open. If another plan covers everything you take without restrictions at a similar premium, take it.
A premium increase announces itself in bold type on page one. Two letters in a table do not, and they are the ones that decide whether January goes smoothly.
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Gerelyn Terzo is the author of dividend investing handbook "Dividend Investing Strategies: How to Have Your Cake & Eat It Too." A veteran financial journalist, she covers agri-finance for outlets like Global AgInvesting and the broader stock market and personal finance for 24/7 Wall Street. She began at CNBC and later helped launch Fox Business in New York. Gerelyn currently resides in Woodland Park, Colorado and dabbles in nature photography as a hobby.
