7 Mistakes You're Making With Medicare Enrollment (and How to Fix Them Before December 7)

When you help a parent with Medicare, love gets you to the table. Clear information helps you make a decision together.

Medicare’s Annual Enrollment Period runs October 15 through December 7, 2026. It’s the time for people who already have Medicare to make certain changes to coverage for 2027. Most changes take effect January 1.

If you’re an adult child helping a parent, the details can feel like one more responsibility on a full list. Most families are not Medicare experts. A calm review, a few good questions, and reliable medicare enrollment help can make the process more manageable.

Here are seven common mistakes to watch for, and practical ways to avoid them.

1. You assume the current plan will stay the same

A plan may renew automatically, but that doesn’t mean every detail stays put. Costs, provider networks, prescription coverage, and plan benefits can change from one year to the next.

The fix: Find your parent’s Annual Notice of Change (ANOC) and review it alongside their current coverage documents. Look for changes to premiums, deductibles, copayments, covered benefits, and the service area. If the notice is missing or unclear, call the plan and ask for the 2027 information.

You don’t need to start by comparing every plan in your area. Start by understanding what may change in the plan your parent has now.

2. You choose by monthly premium alone

A low premium can look like the easiest choice, especially when a household is watching its budget. But the monthly cost is only one part of the picture.

Deductibles, copayments, coinsurance, prescription expenses, and, if it’s a Medicare Advantage plan, the annual out-of-pocket limit can all affect what your parent pays.

The fix: Compare estimated costs across the year, not just the premium. Think about the care your parent actually uses: regular appointments, specialist visits, tests, and prescriptions. A plan that looks inexpensive at first glance may not fit their usual care or budget as well as another option.

Medicare’s Plan Compare tool can help you review plans available in your parent’s area. Use it as a starting point, then confirm important details with the plan.

3. You don’t check whether their doctors are still in network

A familiar doctor can be part of a parent’s comfort and continuity of care. With Medicare Advantage, a provider’s participation can depend on the specific plan, not just the insurance company’s name.

The fix: Make a short list of the doctors, specialists, hospitals, and other providers your parent wants to keep. Check them against the exact 2027 plan. When the choice matters, confirm directly with both the plan and the provider’s office.

Also consider where your parent gets care. A plan’s network may be less convenient if they see a specialist in another town or spend part of the year somewhere else.

4. You check the plan but not the complete medication list

Prescription coverage can change, too. A medication that was covered this year might have a different cost, coverage rule, or pharmacy option in 2027.

The fix: Gather an up-to-date list of every prescription your parent takes, including dosage and frequency. Use Medicare Plan Compare to check the plan’s drug coverage and estimated costs. Pay attention to whether a medication is covered, its cost, any restrictions, and which pharmacies are preferred or in network.

Then confirm anything important with the plan or pharmacy. A quick check now can prevent a confusing surprise after a new plan year begins.

5. You treat someone else’s plan recommendation as a perfect fit

A neighbor’s plan may work well for them. That doesn’t mean it’s right for your parent. People have different doctors, prescriptions, budgets, travel patterns, and preferences about how they receive care.

The fix: Compare the options against your parent’s real needs. Consider the providers they want to see, the medicines they take, expected costs, and how they want to access care. If you’re considering a move between Medicare Advantage and Original Medicare, get clear on what the change means for their coverage.

For example, rules for getting a Medigap policy can depend on timing, state protections, and personal circumstances. Don’t assume you can make one change and easily reverse it later. Medicare’s overview of Original Medicare and Medicare Advantage is a useful place to understand the basic differences.

6. You forget to check other coverage before making a change

Some parents also have employer, union, retiree, Medicaid, or other coverage. Changing Medicare coverage without checking how those benefits fit together could affect more than one part of their healthcare arrangement.

The fix: Before enrolling in a different plan, contact the benefits administrator or insurer for any other coverage your parent has. Ask how a Medicare change could affect those benefits, including prescription coverage.

If you’re helping your parent make calls or use online tools, include them in the conversation where possible. Their preferences and permission matter. If you need to speak on their behalf, ask Medicare or the plan what authorization is required.

7. You wait until the deadline, or assume you can enroll later

The deadline is December 7, 2026. For an enrollment request to count for this period, the plan must receive it by that date. Waiting leaves less time to check a provider, confirm a medication, or resolve a question.

The Annual Enrollment Period is also not the same as every other Medicare enrollment window. A different enrollment opportunity may apply to some people, but it won’t necessarily be available to everyone or allow the same changes.

The fix: Work backward from December 7. Gather the current plan documents, provider list, medication list, and other coverage details early enough to compare them carefully. Once a decision is made, save the enrollment confirmation and keep the new plan information with your parent’s records.

If you need one-on-one, unbiased Medicare counseling, contact your local State Health Insurance Assistance Program (SHIP) or call 1-800-MEDICARE at 1-800-633-4227. These resources can help you understand options without turning a family conversation into a sales conversation.

Make Medicare one part of being prepared

A Medicare review can bring up bigger family questions: Who knows the medication list? Where are the insurance details? If a parent needs help unexpectedly, will the right information be easy to find?

Those questions are part of caregiving, too. Shawn Caprice Houston brings more than 20 years of professional experience in Medicare Advantage and senior primary care, along with personal experience caring for both parents. At Houston Legacy Institute, that combination informs practical family caregiver resources designed to help families prepare before a crisis, not feel blamed for what they haven’t organized yet.

The Leave Nothing to Chance: Houston Legacy Emergency Family Planning Guide helps families gather essential information (including medications, doctors, insurance details, and important documents) in one organized place. It’s a practical next step after reviewing a parent’s Medicare information.

For more support and ongoing caregiving resources, you can also visit the Houston Legacy Institute community.

Medicare decisions are personal, and plan details can change. This article is educational, not individualized insurance advice. Confirm coverage and enrollment information with Medicare, the plan, or a qualified professional before making a decision.

Start with Leave Nothing to Chance. Stay connected through the Houston Legacy Institute community.