What Is the Annual Notice of Change?
Every year in September, every person enrolled in a Medicare Advantage plan or a standalone Part D prescription drug plan receives a document called the Annual Notice of Change (ANOC). This document is mailed by your insurance carrier and describes every change that will take effect on January 1 of the coming year. Federal law requires insurers to send it by September 30, before the Annual Enrollment Period begins on October 15.
The ANOC is not marketing material. It is a formal disclosure of plan changes that affect your costs, benefits, coverage, and access to care. It is also one of the most commonly ignored pieces of mail that Medicare beneficiaries receive. Most people briefly scan it or file it away without reading it carefully. That habit can be expensive.
What the ANOC Contains: What to Look For
The ANOC lists all changes to your plan's terms compared to the current year. The most important sections to review carefully include:
- Premium changes: Your monthly plan premium may increase or decrease. Even a small increase multiplied over 12 months can be significant, and a premium increase relative to competing plans means it is worth shopping alternatives during AEP.
- Deductible changes: Both medical and prescription deductibles may change. A zero-deductible plan may add a deductible for the coming year. A low deductible may increase substantially.
- Out-of-pocket maximum changes: The MOOP may increase, reducing your protection against catastrophic costs. Check this number every year.
- Formulary changes: Your medications may move to a higher cost-sharing tier, be added to a step therapy requirement, or be removed from the formulary entirely. This is one of the most impactful changes because it directly affects your monthly medication costs.
- Benefit changes: Extra benefits like dental, vision, hearing, gym membership, or over-the-counter allowances may change in value, scope, or availability.
- Network changes: Physicians and hospitals that were in-network may no longer be contracted with your plan. If your primary care physician or a specialist you rely on is no longer in-network, you will need to make a decision about keeping the plan or finding a new one.
- Prior authorization changes: New services or drugs may require prior authorization that did not require it previously.
Why September-October Is the Right Time to Read It
The AEP runs from October 15 through December 7 each year. Changes you make during AEP take effect January 1. The ANOC is sent in September precisely to give you time to review the changes before AEP opens and to allow you to compare alternatives while you still have time to switch.
If you receive the ANOC in late September, open it immediately and go directly to the summary of changes section. This section lists every change in a single consolidated list. Look specifically for premium increases, formulary changes affecting your current medications, and network changes involving your doctors or preferred hospitals.
Using the ANOC as a Trigger for an Annual Review
Even if the ANOC shows no significant changes to your current plan, the arrival of the ANOC each September is the right trigger to schedule your annual Medicare review. Your health situation may have changed. New plans may be available in your area with better benefits, lower premiums, or different formulary tiers for your medications. The plan that was optimal for you last year may no longer be optimal today.
During a Medicare review, a licensed Medicare agent can compare your current plan against all available alternatives in your ZIP code, run a formulary comparison for all of your medications, check your doctors against available network options, and identify plans with better coverage at the same or lower cost. This review costs you nothing and takes about 30 to 60 minutes.
What Happens If You Do Nothing
If you take no action during AEP, your current plan automatically renews for the next year under whatever terms the ANOC disclosed. This is fine if your plan's changes are minimal and no better alternatives exist. But it can be costly if your plan significantly raised its premium, moved your medications to higher tiers, or dropped your preferred doctors from its network. Auto-renewal is convenient but should be an active choice, not a default resulting from not reading the ANOC.
Call Insurance Innovators LLC at (530) 395-5309 when your ANOC arrives. We review it with you, compare your options, and help you make an informed decision before the December 7 AEP deadline.

