5 Medicare moves to make before December 7 to avoid higher bills

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By: Jessica Morrison

Open enrollment runs October 15–December 7, 2025. A few quick checks now can prevent surprise premiums, drug denials, and out-of-network charges on January 1, 2026.

Missing this window can lock you into higher costs for a full year. Plans change prices, drug tiers, and provider networks annually, so a set-and-forget approach risks a painful new bill at the pharmacy counter or after a routine visit.

What could shift next year and why it matters

Plans can update premiums, copays, and deductibles, change pharmacy and doctor networks, and move medications to new tiers. Even if you’re happy today, your 2026 costs could rise if a drug jumps tiers or a clinic leaves your plan’s network. Review your plan’s annual notice and compare alternatives during the October 15–December 7 window.

Will your doctors and drugs still be covered next year?

Call your doctors’ offices to confirm they will accept your 2026 coverage, then check each routine prescription against the plan’s formulary and tier level. Watch for quantity limits and prior-authorization rules. A five-minute cross-check now can prevent a January 1 denial at the pharmacy.

Who wins and who loses when you stay vs switch

Staying put may help if your providers and meds line up and your total annual cost is stable. Switching can pay off when a different plan offers your drugs on lower tiers, adds your clinic, or caps costs more effectively.

“Comparing options each fall helps people find coverage that better fits their health and budget for the coming year.” — Meena Seshamani, CMS deputy administrator

Your three key steps before the window closes

Start with your current plan’s annual notice, then compare alternatives using the official tool and a simple cost worksheet. If you find a better fit, submit your change before December 7 so it starts January 1, 2026.

Step Detail Deadline
Read changes Scan your plan’s annual notice for premium, drug tier, and network updates By Oct 31
Verify fit Call clinics; check every prescription’s tier and rules; estimate yearly costs By Nov 15
Choose and enroll Pick the lowest total cost plan that covers your doctors and meds By Dec 7

 

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What to expect before January 1

If you enroll by December 7, your new coverage begins January 1, 2026. Keep confirmation emails or letters handy. If you later regret a choice, the Medicare Advantage Open Enrollment Period (January 1–March 31, 2026) lets you switch once or return to Original coverage. A separate five-star option sometimes allows one switch between December 8 and November 30 if a top-rated plan exists in your area. Mark these dates now to avoid missing relief windows.

SOURCES
https://www.medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan
https://www.medicare.gov/publications/10050-medicare-and-you.pdf
https://www.cms.gov/newsroom/press-releases/medicare-advantage-and-medicare-prescription-drug-programs-remain-stable-cms-implements-improvements


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