Medicare Part D
Medicare Part D Drug Cap 2027: Knoxville, TN
KNOXVILLE, Tenn. — On Jan. 1, 2027, the way you pay for prescription drugs under Medicare Part D changes again. The firm annual limit on what you pay out of pocket at the pharmacy counter moves to $2,400. Once you hit that number, you pay nothing for covered drugs for the rest of the calendar year.
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Key takeaways
- Starting Jan. 1, 2027, the Medicare Part D yearly out-of-pocket cap is $2,400, up from $2,100 in 2026.
- Once you reach the $2,400 cap in 2027, you owe nothing more for covered drugs the rest of the year.
- The old "donut hole" coverage gap is gone, replaced by a simpler three-phase structure: deductible (up to $615 in 2026 and up to $700 in 2027), initial coverage, and catastrophic coverage.
- Medicare's optional, free Prescription Payment Plan lets you spread drug costs into monthly bills instead of paying a big amount upfront, but missing payments can get you removed from the program.
If you take expensive medications — or you've ever been surprised by a pharmacy bill in the fall — this is the Medicare update to understand before the Annual Enrollment Period closes on Dec. 7, 2026.
The Part D cap, in plain English
Every year, Medicare sets a ceiling on how much you personally have to spend on Part D covered drugs. In 2026, that ceiling is $2,100. For 2027, it moves up to $2,400.
A few things to know:
- The cap applies to covered prescription drugs under your Part D plan (or the drug portion of a Medicare Advantage plan that includes drug coverage).
- It counts what you pay — deductibles and copays for covered drugs — not your monthly premium.
- It resets every January.
- Part D plans in 2026 can charge a deductible of up to $615 before regular cost-sharing begins.
Once your out-of-pocket spending reaches the annual cap — $2,100 in 2026 or $2,400 in 2027 — you're done paying for covered drugs until the calendar flips.
The "donut hole" is gone — really gone
For years, the Part D coverage gap — the so-called "donut hole" — was one of the most confusing parts of Medicare. You'd pay one amount early in the year, then hit a gap where costs jumped, then eventually reach "catastrophic" coverage.
That structure was eliminated in 2025. Medicare Part D now has just three phases:
1. Deductible — you pay full negotiated price until you meet your plan's deductible (up to $700 in 2027). 2. Initial coverage — you and your plan share costs until you hit the out-of-pocket cap ($2,400 in 2027). 3. Catastrophic — you pay nothing for covered drugs the rest of the year.
No more donut hole math. If you're helping a parent or spouse make sense of a pharmacy bill, this is the change to explain first.
The Medicare Prescription Payment Plan: spreading the cost
Here's the piece a lot of people miss. Even with the $2,400 cap in 2027, hitting that number early in the year can hurt — especially if a single specialty medication costs more than $1,000 in January.
That's why Medicare offers the Medicare Prescription Payment Plan (sometimes called "M3P" or "smoothing"). It's optional and free to join. Here's how it works:
- You still owe the same total amount for your drugs over the year.
- But instead of paying the pharmacy at pickup, your Part D plan bills you monthly, spreading the cost across the remaining months of the year.
- You can opt in before the plan year starts or any time during the year by contacting your Part D plan directly.
This plan doesn't lower your total drug costs — it just changes the timing. For someone facing a big January bill, that can be the difference between filling a prescription and walking away from the counter.
A common mistake to avoid: Signing up for the payment plan and then not paying the monthly bill. If you miss payments, you can be removed from the program and have to pay the pharmacy directly again. It's a budgeting tool, not a discount.
What this means for Knoxville-area readers
Knoxville is in Knox County, where Medicare beneficiaries can choose from Original Medicare plus a stand-alone Part D plan, or a Medicare Advantage plan that includes drug coverage. The 2027 rules — the $2,400 cap, the $700 maximum deductible, the three-phase structure, and the payment plan option — apply to Part D coverage across the country, regardless of which plan or carrier you choose.
What varies locally is the number of plans available and how each one structures its formulary (the list of covered drugs) and pharmacy network. That's a county-level decision made by CMS and the insurers.
If you want to compare what's offered in Knox County for 2027 — 60 Medicare Advantage plans from 11 carriers this year — the official Medicare Plan Finder at medicare.gov lets you enter your ZIP code and your list of medications to see how each plan would handle them.
Mistakes to avoid this fall
- Assuming your 2026 plan works the same in 2027. Every Part D and Medicare Advantage plan sends an Annual Notice of Change (ANOC) each September. Read it. Formularies, tiers, and pharmacy networks change.
- Ignoring the payment plan option if you take expensive drugs. If a $2,000 January bill would be a problem, look into smoothing before you need it.
- Waiting past Dec. 7. That's the deadline to change your Part D or Medicare Advantage plan for coverage that starts Jan. 1. Medicare Advantage enrollees get a second window (Jan. 1 – March 31) to switch, but it has limits.
- Forgetting about IRMAA. Higher-income beneficiaries (above $109,000 single / $218,000 joint in 2026) pay a surcharge on top of the standard Part D premium.
By the numbers
Medicare Part B premium, 2006–2026
The standard monthly Part B premium has climbed from $88.50 in 2006 to $202.90 in 2026. Hover any point for that year’s premium.
Source: CMS. Standard premium shown; in some hold-harmless years many existing enrollees paid less. Confirm at Medicare.gov.
By the numbers
How people get Medicare in Knox County
(MA penetration in Knox County)
MA penetration from CMS enrollment data; Medigap share is an estimate. U.S. average is about 54% Medicare Advantage. These are area-level figures, not plan-specific.
Prescription coverage
How Medicare Part D works in 2027
The old coverage gap (“donut hole”) was eliminated in 2025 (three phases now). The yearly out-of-pocket cap on covered drugs is $2,100 in 2026 and $2,400 in 2027, and you can spread those costs across the year with the Medicare Prescription Payment Plan.
Try it
How the 2026 Part D drug cap works
Slide to your estimated yearly prescription costs and see how the new $2,100 out-of-pocket cap protects you. This illustrates the standard Part D benefit; your plan may structure costs differently.
Once your out-of-pocket spending on covered drugs reaches $2,100, you pay nothing more for the rest of 2026. Confirm details at Medicare.gov.
Explore
When can you enroll? An interactive year
Enrollment windows are federal and the same nationwide. Confirm your personal dates at Medicare.gov or 1-800-MEDICARE.
Good to know
Frequently asked questions
Does the $2,100 cap include my monthly premium?
If I join the Prescription Payment Plan, do I still hit the $2,100 cap?
Do I have to sign up for the payment plan every year?
- CMS — Medicare Part D program rules (medicare.gov)
For personalized answers, contact Medicare.gov, 1-800-MEDICARE, or your local SHIP.