Medicare Part D

Santa Clarita Part D: how to spot 2027 drug list changes before Jan. 1

SANTA CLARITA, Calif. — The thick envelope your Part D or Medicare Advantage plan mails each fall is not junk. It is the Annual Notice of Change (ANOC), and for 2027 it is the single best way to see whether a drug you take every day will cost more, land on a different tier, or need extra paperwork starting January 1.

Santa Clarita is in Los Angeles County, where dozens of Part D and Medicare Advantage prescription plans are sold. Every one of them can update its formulary — the list of covered drugs — from one plan year to the next. That is why the same pill you picked up in October can look different at the pharmacy counter in January.

The Annual Enrollment Period runs October 15 through December 7. That window is your chance to compare plans against the drugs you actually take before the new rules kick in.

What a formulary is, and why it changes

A formulary is the list of prescription drugs a Part D plan agrees to cover. Plans group those drugs into tiers, usually running from generics on the lowest tier up to specialty medications on the highest. The tier a drug sits on affects what you pay out of pocket.

Plans revise these lists every year. A drug may move up a tier, move down a tier, or come off the list entirely. New generics, new brand-name approvals, and new rebate deals with drugmakers all push these changes. None of it is personal — but it can hit your wallet hard if you don't see it coming.

The four rules that can change on your drugs

There are four common tools plans use to manage prescription costs. Any of them can be added, removed, or tightened for 2027:

• Tier placement. The same drug can sit on Tier 2 one year and Tier 3 the next. Higher tier, higher cost share.
• Prior authorization. Your doctor has to get the plan's approval before the prescription is filled. Without it, the plan won't pay.
• Quantity limits. The plan caps how much of a drug you can get in a set time — for example, 30 tablets per month.
• Step therapy. You have to try a lower-cost drug first. Only if that doesn't work will the plan cover the one your doctor originally wrote.

If any of these apply to a drug you take, your ANOC will say so.

How to read the ANOC without falling asleep

The ANOC is long, but you don't have to read every page. Focus on three things:

1. The premium, deductible and cost-sharing summary. Compare the 2026 numbers to the 2027 numbers, line by line. 2. The section on drug coverage changes. This is where tier moves and new restrictions show up. Look for the names of the drugs you personally take. 3. The pharmacy network. Preferred pharmacies can change, and that can quietly raise what you pay even if the drug itself didn't move.

If your plan is being discontinued in Los Angeles County, the ANOC will say that too, along with your options.

What's new for Part D in 2027

A few program-level facts apply no matter which plan you have:

• The $2,400 out-of-pocket cap in 2027. Once your covered drug spending hits that amount for the year, you pay nothing more for covered Part D drugs the rest of the year. The cap was $2,100 in 2026.
• A $700 maximum deductible in 2027. Plans can charge less, but not more. The 2026 maximum was $615.
• The coverage gap is gone. Since 2025, Part D has three phases instead of four — no more "donut hole."
• The Medicare Prescription Payment Plan. This is optional. It lets you spread your drug costs into monthly bills instead of paying big amounts at the pharmacy. You can sign up through your plan.
• IRMAA. Higher-income enrollees pay a surcharge on Part B and Part D. For 2026, those surcharges begin above $109,000 in income for a single filer.

What to do if a drug you take is affected

If your ANOC shows a change you don't like, you have real options during Annual Enrollment. You can:

• Compare other Part D or Medicare Advantage plans on medicare.gov's Plan Finder, entering your exact prescriptions and preferred pharmacy.
• Ask your doctor whether a covered alternative would work.
• Request a formulary exception from the plan if there is a medical reason you need the original drug.
• Use the transition fill rule: new enrollees and continuing members whose drugs are affected can generally get a one-time temporary supply early in the year while they and their doctor sort out next steps.