Medicare Part D

Somerville Medicare Part D: how a covered drug can move tiers or need approval in 2027

SOMERVILLE, Mass. — The thick envelope that lands in Middlesex County mailboxes each September has an unglamorous name, the Annual Notice of Change, and an unglamorous look. But for anyone on a Medicare Part D drug plan, it is the single most important piece of mail of the year. It tells you, before the calendar flips, whether the medication you took all year will be treated the same way in January.

This fall, that matters more than usual. Part D is in its third year under a hard out-of-pocket cap — $2,100 in 2026, rising to $2,400 in 2027 — and plans are still adjusting how they manage the drugs on their lists. A pill that was easy to fill in November can, on Jan. 1, sit on a different tier, need a doctor's sign-off, or come with a monthly quantity limit. The drug is still "covered." The path to it just changed.

What the ANOC actually is

The Annual Notice of Change is a document every Part D and Medicare Advantage drug plan is required to send its members before the fall enrollment window opens. It compares your 2026 plan to the 2027 version — premium, deductible, drug list (called a formulary), pharmacy network, and the rules attached to specific medications.

It is not marketing. It is a compliance document. And it is the only place you will see, in one spot, exactly what is changing about your coverage. If you throw it out with the flyers, you lose your best chance to catch a change before it hits your pharmacy counter.

Tiers: same drug, different shelf

Most Part D plans sort covered drugs into tiers — usually five or six of them, running from preferred generics up through specialty drugs. The tier determines what you pay at the pharmacy.

Plans can move a drug from one tier to another between plan years. A generic that sat on a low tier in 2026 might land on a higher tier in 2027, or vice versa. Nothing about the drug changed. The plan's contract with the manufacturer, or its overall cost strategy, did. The ANOC will list these shifts for the drugs you have filled.

Prior authorization, step therapy, quantity limits

Beyond price, plans use what CMS calls "utilization management" tools. Three show up most often:

• Prior authorization means your prescriber has to submit paperwork showing the drug is medically necessary before the plan will pay. It can be added to a drug that had no such requirement the year before.
• Step therapy means the plan wants you to try a lower-cost alternative first. If it doesn't work, you can move up to the originally prescribed drug.
• Quantity limits cap how much of a drug you can get in a set period — say, 30 tablets per 30 days.

None of these mean a drug is dropped. They mean there is a new hoop between you and the refill. The ANOC flags which of your drugs will have new requirements.

Transition fills: a short runway, not a solution

If you stay in the same plan and a drug you already take suddenly has new restrictions — or is no longer on the formulary at all — Medicare requires the plan to offer a one-time transition supply, typically a 30-day fill, early in the new plan year. That gives you time to work with your prescriber on an exception request, a switch to a covered alternative, or, if it comes to it, a different plan during Medicare Advantage Open Enrollment (Jan. 1 – March 31, for Advantage members only).

Transition fills are a safety net, not a plan. Read the ANOC in the fall so you are not relying on them in January.

How to read the ANOC in 15 minutes

You do not have to read every page. Focus on four things:

1. The drug list changes section. Find each medication you take. Note any tier change, any new "PA," "ST," or "QL" flag. 2. The premium and deductible. The Part D maximum deductible is $615 in 2026 and $700 in 2027, but plans can set it lower or at zero. 3. The pharmacy network. Preferred pharmacies can change. So can mail-order terms. 4. The out-of-pocket structure. With the cap moving from $2,100 in 2026 to $2,400 in 2027, ask whether the Medicare Prescription Payment Plan — the option to spread drug costs into monthly bills — makes sense for you.

If any of those look wrong for your situation, the Annual Enrollment Period (Oct. 15 – Dec. 7) is when you can change plans for a Jan. 1 start.

Where Somerville fits in

Somerville is in Middlesex County, where Medicare beneficiaries choose from a wide roster of stand-alone Part D plans and Medicare Advantage plans that include drug coverage. Plan availability is set at the county level, so two neighbors on the same street have the same menu — but the ANOC each of them receives depends on the specific plan they are enrolled in. Your neighbor's letter tells you nothing about your coverage.