Medicare Open Enrollment 2026: A Practical Checklist

October 6, 2026

Medicare Open Enrollment: What to Check Before Changing Plans This Fall

A 2026 review checklist for 2027 coverage, including prescriptions, total costs, and the Medigap question

Featured illustration: A useful annual review considers coverage, costs, and enrollment rights together.

A Medicare plan that worked this year may deserve another look next year. The premium can change, but so can prescription coverage, out-of-pocket costs, and the details that determine whether a plan fits everyday care. The annual notice from the plan is the starting point, not just another piece of mail. ^[1]

For the fall 2026 Open Enrollment Period, the dates are October 15 through December 7. Changes made in that window generally take effect January 1, 2027, provided the plan receives the enrollment request by December 7. The right question is not simply “Which premium is lowest?” It is “What coverage will I actually have next year?” ^[2]

Key takeaways

• Fall Open Enrollment allows changes to Medicare Advantage and Part D coverage, including switching between Original Medicare and Medicare Advantage. ^[2]
• The January 1–March 31 Medicare Advantage Open Enrollment Period has different rules and is for people already in Medicare Advantage. ^[3]
• Fall Open Enrollment does not create a new guaranteed right to buy Medigap. ^[4]
• Compare the coming year’s prescriptions, pharmacies, doctors, cost sharing, and coverage rules, not just the monthly premium. ^[3,5]

Plan-year accuracy: This guide was reviewed September 8, 2026. The fall dates below relate to choosing 2027 coverage. No 2026 premium, deductible, or drug-cost cap is presented as a 2027 amount. Use the coming year’s official plan materials and Medicare Plan Compare when those details are available.

Know which enrollment window you are using

Enrollment window	Who and what it covers	Usual effective date
Oct. 15–Dec. 7, 2026	Fall changes to Medicare Advantage or Part D; switches to or from Original Medicare.	Jan. 1, 2027
Jan. 1–Mar. 31	Existing Medicare Advantage members can switch MA plans or return to Original Medicare and add Part D.	First of the next month after the plan gets the request
Special Enrollment Period	Qualifying events, such as certain moves or coverage losses; available choices depend on the event.	Depends on the event

Table note: General federal enrollment framework. Initial enrollment and special-event rules are separate; this is not a complete list of every enrollment opportunity. ^[2,3]

Do not confuse changing an existing health or drug plan with first enrolling in Medicare Part A or Part B. Those sign-up rules have their own initial, general, and special enrollment periods. Waiting for the fall plan-shopping window can be the wrong approach for someone whose initial Medicare enrollment is due sooner. ^[3,12]

Start with the Annual Notice of Change

Medicare says plans send the Annual Notice of Change, or ANOC, in September. It describes changes effective in January. Review it alongside the next year’s Evidence of Coverage, which supplies the detailed plan terms, and keep a copy of both with the comparison notes. ^[1,13]

A useful first pass is to mark anything affecting care already being used: a regular prescription, a specialist visit, outpatient therapy, or a preferred pharmacy. Then make a second pass for less frequent but potentially expensive needs, such as an inpatient stay. This creates a focused list of questions instead of an unfocused comparison of advertised extras.

Check every prescription, not just the plan name

Enter the exact drugs, strengths, quantities, and preferred pharmacies when comparing options. Medicare Plan Compare can estimate monthly and annual drug costs from that information. Confirm the details for the next plan year rather than assuming a familiar plan name means the same coverage. ^[3]

A covered-drug list is called a formulary. A drug’s presence on that list is only one question. Check whether the plan requires prior authorization, step therapy, or quantity limits. Prior authorization is advance approval; step therapy can require trying a specified alternative first. An exception may be available, but it requires a process and should not be treated as an automatic approval. ^[6]

Verify the exact medicine, coverage rules, and pharmacy before relying on a cost estimate.

Pharmacy choice matters too. Compare the costs at the pharmacies actually available and convenient to use, including any preferred-network or mail-order options. A favorable estimate built around a different pharmacy may not describe the cost at the counter you intend to visit. ^[5]

Compare annual cost and financial exposure

The monthly plan premium is a fixed cost, not a complete budget. Drug deductibles, copayments, coinsurance, and medical cost sharing can change the comparison. With Medicare Advantage, the Part B premium generally continues even when the plan advertises a $0 additional plan premium. ^[5,7]

Original comparison example: Suppose hypothetical drug Plan A has a $0 monthly premium and $1,200 in estimated annual out-of-pocket prescription costs. Plan B has a $30 monthly premium and $500 in estimated annual prescription costs. Including premiums, the totals are $1,200 and $860. Plan B is $340 lower in this illustration, assuming the drug estimates already include deductible and cost sharing. These are not actual plan prices.

For medical expenses, Original Medicare has no annual out-of-pocket limit by itself. Medicare Advantage plans have limits for covered Medicare services, with network rules affecting which limit applies. That does not turn the plan’s limit into an all-inclusive cap on every household health expense: premiums, drug spending, and noncovered services require separate review. ^[7]

The Medicare Prescription Payment Plan is another separate issue. It can spread covered out-of-pocket drug costs across the calendar year, but it does not reduce the drug cost itself. Payment timing should not be confused with a discount or with choosing a different insurance plan. ^[8]

Verify access to doctors and ongoing care

For Medicare Advantage, check the exact plan’s network for the coming year and verify participation with both the plan and the providers. A doctor accepting Original Medicare is not the same as a doctor participating in a particular Medicare Advantage network. Also review referrals and prior authorization for the services that matter to you. ^[3,7]

Include hospitals, specialists, outpatient facilities, and relevant equipment suppliers, not only the primary-care office. If living in another state part of the year, check how non-emergency care works there. The goal is to identify practical access constraints before an enrollment choice is made. ^[3]

The Medigap question comes before dropping coverage

Medigap is supplemental insurance for Original Medicare; it is not a supplement to Medicare Advantage. Federal law provides a one-time six-month Medigap Open Enrollment Period beginning the first month a person is both 65 or older and enrolled in Part B. That protection does not restart each fall. ^[4,9]

Outside that window, an insurer may use medical underwriting and may decline an application unless guaranteed-issue rights or other protections apply. State law can also provide additional rights. The right to leave Medicare Advantage and the right to buy a particular Medigap policy are separate questions. ^[4]

Switching to Original Medicare does not automatically secure a Medigap policy.

Texas context: The Texas Department of Insurance explicitly distinguishes annual Medicare Open Enrollment from Medicare supplement enrollment. Its guide explains state-specific rights, including protections for some people under 65. Verify the applicable protection, application deadline, and effective date before relying on a replacement policy. [10]

For example, someone in Medicare Advantage might plan to return to Original Medicare and add Medigap. The fall election can address the first step while the second still requires a separate eligibility and underwriting check. Assuming both steps are automatic can leave a very different cost-sharing arrangement than intended. ^[2,4]

Protect drug coverage and existing benefits

A person who goes 63 consecutive days or more without Medicare drug coverage or other creditable prescription coverage after eligibility may face a Part D late-enrollment penalty upon enrolling later. Keep employer or union creditable-coverage notices. Do not drop drug coverage simply because prescriptions are inexpensive today. ^[11]

If employer, retiree, or union coverage is involved, review the consequences with that plan before changing Medicare enrollment. Adding Medicare drug coverage can affect existing benefits for the member or family. The lowest standalone premium is not useful if it unintentionally disrupts valuable other coverage. ^[11]

A practical annual review checklist

• Identify the correct enrollment period and the deadline for the plan to receive the request. ^[2,3]
• Read the ANOC and next-year Evidence of Coverage; make a list of meaningful changes. ^[1,13]
• Update the prescription and pharmacy list, then compare total estimated annual costs. ^[3,5]
• Verify doctors, facilities, network restrictions, and authorization requirements. ^[3,6,7]
• If changing to Original Medicare, resolve Part D and any intended Medigap coverage first. ^[2,4]
• Save the exact plan identifier, enrollment confirmation, effective date, and comparison notes.

Frequently asked questions

Do I have to change plans every year?

No. A review may confirm that the current coverage still fits. Check renewal and change notices so keeping a plan is an informed choice, not an assumption. ^[1,14]

Is the January–March window another chance for everyone?

No. Medicare Advantage Open Enrollment is for people already enrolled in Medicare Advantage. It is not a general second fall enrollment window for people in Original Medicare. ^[3]

Does fall Open Enrollment guarantee a Medigap policy?

No. Medigap has separate enrollment protections, and underwriting or other eligibility rules may apply outside them. ^[4]

Where can someone get neutral help?

Medicare.gov and the State Health Insurance Assistance Program, or SHIP, provide official information and free, non-insurer-affiliated counseling. The Texas insurance department’s guide also identifies state resources. ^[3,10]

Final takeaway

A good Medicare review tests the coverage against real prescriptions, providers, and possible expenses. It also checks the enrollment rights needed to make the intended change. The result may be a new plan or a deliberate decision to stay, but it should rest on next-year details and a complete coverage picture.

Claim notes and fact-checking record

Verification scope: Enrollment dates and effective dates, ANOC timing, coverage comparisons, drug rules, cost concepts, Medigap protections, Texas context, and creditable coverage were checked against Medicare.gov and TDI. The cost example was recalculated. No unverified 2027 prices or benefit limits are supplied.

Marker	Primary-source support
[1]	Medicare: Annual Notice of Change — September notice and January coverage/cost changes.
[2]	Medicare: Open Enrollment — October 15–December 7 dates, available changes, and January 1 effective date.
[3]	Medicare: Joining a plan — Enrollment periods, comparison inputs, provider checks, and SHIP counseling.
[4]	Medicare: Get ready to buy Medigap — Six-month window, underwriting, guaranteed-issue protections, and state rights.
[5]	Medicare: Drug coverage costs — Premiums, deductibles, cost sharing, and factors that affect drug costs.
[6]	Medicare: Drug plan rules — Prior authorization, step therapy, quantity limits, and exceptions.
[7]	Medicare: Compare Original Medicare and Medicare Advantage — Providers, premiums, medical cost sharing, and out-of-pocket limits.
[8]	Medicare: Prescription Payment Plan — Optional payment spreading does not reduce total drug cost.
[9]	Medicare: Medigap basics — Medigap supplements Original Medicare rather than Medicare Advantage.
[10]	Texas Department of Insurance: Medicare supplement guide — Texas enrollment protections and consumer resources.
[11]	Medicare: Creditable prescription drug coverage — 63-day gap rule and effects on other coverage.
[12]	Medicare: When coverage starts — Part A/Part B enrollment periods are separate from fall plan changes.
[13]	Medicare: Evidence of Coverage — Detailed plan coverage, costs, and rights.
[14]	Medicare: Your Yearly Medicare Review — Annual review can include keeping current coverage; used for process, not historical plan-year prices.

Educational use only: This article provides general education, not individualized tax, legal, investment, or insurance advice. Laws, agency guidance, plan terms, and individual circumstances can change. Use the official materials for the applicable year and facts.