The Medicare Annual Notice of Change: What to Read Before October 15

Every September 30, Medicare Advantage and Part D drug plans are required to mail their enrolled members an Annual Notice of Change, or ANOC. This document outlines every change the plan is making to premiums, benefits, copays, provider networks, and drug formularies for the coming year. Most people glance at it briefly and set it aside. That decision can cost hundreds of dollars, eliminate coverage for a needed medication, or result in a January 1 surprise when a preferred doctor is no longer in-network.

Bryce's Take

The ANOC arrives in late September and most people set it aside with the other mail. I review them with clients every fall because that is how we catch formulary changes, premium increases, and network changes before January 1 instead of after. If your plan is quietly raising your specialist copay by $30, you want to know before you see the doctor in January.

What the ANOC is and when it arrives

The Annual Notice of Change is a federally required document that Medicare Advantage and Part D plans must send to enrollees by September 30 each year for changes taking effect January 1. It arrives in a large envelope, typically with the plan's branding, and outlines every material change to the plan's terms for the coming year. CMS requires it to be clear and standardized so beneficiaries can meaningfully compare their current plan against other options during the Annual Enrollment Period, which runs October 15 through December 7.

Premium changes

The ANOC will show your new monthly premium if it is changing. Even a $15 per month increase accumulates to $180 per year. Plans that held premiums steady for several years sometimes announce larger increases in a single ANOC. Compare the new premium against alternatives available in your area during AEP.

Copay and cost-sharing changes

Plans frequently adjust copays for doctor visits, specialist visits, urgent care, emergency room, inpatient hospital stays, and other services. A plan that charged $10 for a specialist visit may increase to $45. If you see specialists regularly, copay changes can substantially change your total annual out-of-pocket spending. Review the benefits summary pages carefully and add up likely copays based on your typical healthcare use.

Formulary changes

Part D formularies change annually. Drugs can move to higher-cost tiers, be removed from the formulary entirely, or have prior authorization added. The ANOC will note formulary changes, and a separate Formulary Transition Notice may accompany it if your specific medications were affected. Log into your plan's website and run your current medications through the plan finder to see exactly what each drug will cost under the updated formulary.

Network changes

Provider networks change at year end. Physicians, specialists, and hospitals that were in-network in the current year may not be in-network starting January 1. The ANOC will note network changes broadly; for specific provider status, verify directly with the plan or on the plan's website before January. If a key specialist or your primary care physician has left the network, switching plans during AEP may be warranted.

What to do between now and December 7

Review the ANOC against your current healthcare usage. Check whether your medications are still on formulary at acceptable tiers. Verify that your key providers remain in-network. Then compare these findings against alternative plans available in your zip code during the Annual Enrollment Period. If your current plan has worsened and a comparable alternative exists at lower cost with better coverage for your needs, AEP is the one window each year where you can make this change without restriction.

Bryce Casson

Licensed Independent Medicare Broker

Bryce Casson is an independent Medicare insurance broker who works with every major carrier. He does not represent any single insurer, which means his recommendations are based on what actually fits each client's situation, not on commissions or quotas.