Annual Notice of Change Part D: What to Look for Before Open Enrollment

Every September, your parent's Part D plan mails a document called the Annual Notice of Change. Most families toss it with the junk mail. That's how a $40/month premium increase or a dropped medication blindsides them in January.

What the ANOC Actually Tells You

The Annual Notice of Change — CMS requires every Part D and Medicare Advantage plan to send it by September 30 — lists every benefit change taking effect January 1 of the following year. It's the plan's legally mandated heads-up, and it covers:

• Premium changes. The monthly premium for 2027 may increase significantly. The Part D Premium Stabilization Demonstration ends after 2026, removing the federal cap that limited annual premium increases to $50. Plans are expected to price more aggressively once that guardrail disappears.
• Deductible changes. The standard Part D deductible rises from $615 in 2026 to $700 in 2027. Your parent's specific plan may set it higher or lower than the standard amount.
• Formulary changes. Drugs can be moved to a higher cost-sharing tier, removed from the formulary entirely, or subjected to new prior authorization or step therapy requirements.
• Pharmacy network changes. A preferred pharmacy may drop to standard-network status, raising copays by an average of $129 per year.
• Cost-sharing structure changes. Plans can shift from flat copays to percentage-based coinsurance, which hits harder on expensive brand-name medications.

How to Read the ANOC Without Getting Lost

The document runs anywhere from 8 to 40 pages depending on the plan. Don't read it cover to cover. Instead, work through three targeted checks:

Check 1: Compare premiums side by side. Look at the monthly premium table first. If the increase is more than $10/month over what your parent pays now, that's $120/year — enough to justify shopping on Medicare Plan Finder during open enrollment.

Check 2: Cross-reference the formulary changes against your parent's medication list. This is the highest-stakes section. Pull out your parent's current prescription bottles and check each drug name against the formulary change list. Watch specifically for drugs moved from Tier 3 (preferred brand) to Tier 4 (non-preferred brand), because the coinsurance jump can double or triple the out-of-pocket cost.

Check 3: Verify pharmacy network status. If your parent's pharmacy was previously in the preferred network, confirm it still is. The ANOC is required to flag pharmacy network changes, but the wording can be buried in a general "network updates" paragraph.

When the ANOC Signals It's Time to Switch

Not every change requires action. A $3 premium increase on a plan that still covers all your parent's medications at preferred-tier pricing is fine. But three red flags mean you should comparison-shop during the Annual Election Period (October 15 through December 7):

1. A current medication is dropped from the formulary or moved behind a step therapy requirement
2. The premium increase exceeds $15/month with no improvement in drug coverage
3. Your parent's pharmacy loses preferred-network status

If any of these apply, run your parent's full medication list through Medicare Plan Finder before December 7. Sort results by "Lowest Estimated Total Annual Drug Cost + Premium" — not premium alone — to find the plan that actually costs less across the full year.

What Happens If You Miss the ANOC

If the document never arrived or got thrown away, your parent's plan is required to provide a copy on request. Call the member services number on the back of the insurance card. You can also find the equivalent information in the plan's Evidence of Coverage document, which is posted on the plan's website each October.

The Annual Election Period closes December 7. If your parent takes no action, the plan's new terms take effect automatically on January 1. There's no second chance until the next fall — unless a Special Enrollment Period applies.

For a structured annual review workflow that walks through the full ANOC analysis, formulary comparison, and Plan Finder process step by step, the Medicare Part D: How to Choose a Drug Plan guide includes a complete annual review checklist you can print and work through each October.

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