The Medicare Prescription Payment Plan, often shortened to M3P, lets anyone with Medicare drug coverage stop paying for Part D prescriptions at the pharmacy counter and instead pay the same amount in monthly bills from their plan, spread across the calendar year. It is free, charges no interest and no fees, and every Part D plan has to offer it. It also does not lower your drug costs by a single dollar. In 2027 the most it can ever spread is $2,400, because that is the year's out-of-pocket cap on covered Part D drugs. Someone who hits that cap with one January fill pays $200 a month for twelve months instead of $2,400 at once.
That is the whole program. The rest of this page is the arithmetic, the groups it genuinely helps, the groups it quietly hurts, and what happens to your participation when 2027 starts.
What the 2027 Numbers Are
The payment plan rides on top of the standard Part D benefit, so the Part D figures set the ceiling on everything it can do.
| 2027 Part D figure | Amount | What it means for the payment plan |
|---|
| Out-of-pocket cap on covered drugs | $2,400 | The most the plan can ever bill you in one calendar year |
| Standard deductible | $700 | Counts toward the cap, so it can be spread |
| 2026 cap, for comparison | $2,100 | A 2026 balance does not carry into the 2027 cap |
| Monthly plan premium | Billed separately | Not part of the payment plan, does not count toward the cap |
| Covered insulin, one-month supply | No more than $35 | Already capped, so there is little left to spread |
| ACIP-recommended adult vaccines | $0 | Nothing to spread |
CMS set the $2,400 cap and the $700 deductible in the Calendar Year 2027 Rate Announcement on April 6, 2026. For the full breakdown of how the 2027 benefit is built, see our guide to Medicare Part D costs and the 2027 cap.
The $2,400 cap applies to everyone with Part D coverage whether or not they use the payment plan. Reaching it means you pay nothing more for covered Part D drugs for the rest of the calendar year. The payment plan does not raise that cap, lower it, or move it.
How Your Monthly Bill Is Calculated
Every Part D plan uses the same formula, which is written into the statute at section 1860D-2(b)(2)(E) of the Social Security Act and the regulation at 42 CFR 423.137. There are two versions of it.
For the first month you participate:
(annual out-of-pocket cap minus what you have already paid out of pocket this year) divided by the number of months left in the year, counting the month you join.
Your plan bills you the lesser of that figure or what you actually owed that month.
For every month after that:
(out-of-pocket costs from earlier months that have not been billed yet, plus any new out-of-pocket costs this month) divided by the number of months left in the year.
Medicare.gov states it in plainer words: "Your monthly bill is based on what you would have paid for any prescriptions you get, plus your previous month's balance, divided by the number of months left in the year."
Two consequences follow from that formula and both matter. Your bill changes every month, so you cannot know next month's number in advance. And every new prescription you fill gets divided over fewer remaining months, so bills generally climb as the year goes on.
Month-by-Month: Hitting the $2,400 Cap in January 2027
Take someone on one specialty drug that runs $7,500 for a 30-day supply, who joins the payment plan during open enrollment so it is active on January 1, 2027. Under the standard benefit they pay the $700 deductible, then 25 percent of the remaining $6,800, which is $1,700. That single January fill produces $2,400 in out-of-pocket costs and tops out the cap on day one.
| Month | New out-of-pocket costs | Bill from the plan | Unbilled balance left |
|---|
| January | $2,400 | $200 | $2,200 |
| February | $0 | $200 | $2,000 |
| March | $0 | $200 | $1,800 |
| April | $0 | $200 | $1,600 |
| May | $0 | $200 | $1,400 |
| June | $0 | $200 | $1,200 |
| July | $0 | $200 | $1,000 |
| August | $0 | $200 | $800 |
| September | $0 | $200 | $600 |
| October | $0 | $200 | $400 |
| November | $0 | $200 | $200 |
| December | $0 | $200 | $0 |
| Total | $2,400 | $2,400 | |
Every refill for the rest of 2027 costs this person nothing, because the cap is already met. The plan premium arrives as a separate bill each month on top of the $200.
This is the best case for the program, and it is a real one. A person who cannot produce $2,400 in January but can produce $200 can start a drug they otherwise could not fill. Nothing was saved. Something was made possible.
Why the Month You Start Changes Everything
The denominator in the formula is months left in the year. Start late and the same $2,400 lands in fewer, larger payments.
| Month you join with $2,400 of costs | Months to spread | Monthly bill |
|---|
| January | 12 | $200 |
| April | 9 | about $267 |
| July | 6 | $400 |
| October | 3 | $800 |
| December | 1 | $2,400 |
Medicare.gov warns directly against signing up after September for this reason.
There is a worse version. Costs you already paid at the pharmacy are subtracted in the first-month formula, and they are gone. If you hit the $2,400 cap in January by paying the pharmacy, then join the payment plan in July, the math is ($2,400 minus $2,400) divided by 6, which is zero. There is nothing left to spread, and the program does nothing for you at all. It can only spread costs you have not paid yet.
Who It Actually Helps
CMS requires plans to reach out to enrollees it defines as likely to benefit. The regulation uses two specific triggers, and they are a good self-test:
- You incur $600 or more in out-of-pocket costs for a single covered Part D drug, or
- You incurred $2,000 in out-of-pocket costs for covered Part D drugs in the first nine months of the prior year.
In practice the program fits people with high drug costs concentrated early in the year: cancer drugs, specialty biologics, MS and rheumatoid arthritis treatments, newer heart failure drugs. It also fits anyone facing a sudden expensive fill before September who has the monthly cash flow but not the lump sum.
Who It Hurts
Medicare.gov lists seven situations where the payment plan "may not be the best choice." Here they are with what is actually at stake.
You get or could get Extra Help. This is the big one. Extra Help, also called the Part D low-income subsidy, cuts drug costs instead of rescheduling them. In 2027 someone with full Extra Help between 100 and 150 percent of the poverty level pays $5.80 for a generic and $14.40 for a brand-name drug. A full-benefit dual eligible at or under 100 percent of poverty pays $1.65 and $5.00. Extra Help also eliminates or sharply reduces the Part D premium and the deductible. Spreading a $5.80 copay across twelve months accomplishes nothing, and an Extra Help enrollee will almost never come near $2,400 in a year. The real harm is the substitution: an hour spent enrolling in a payment plan is an hour not spent applying for the program that would have cut the bill. Medicare.gov's own decision tool screens on income first, asking whether annual income is less than $23,940 for a single person or $32,460 for a married couple. If you are near those numbers, apply for Extra Help before you consider M3P. Our guide to Extra Help income limits and how to apply covers that process.
You get or could get a Medicare Savings Program. Same logic. These programs pay Part B premiums, and the Qualified Medicare Beneficiary category brings automatic Extra Help with it. Real savings beat rescheduled payments.
You get drug help from somewhere else. A State Pharmaceutical Assistance Program, a manufacturer assistance program, a coupon program, or other coverage may already be shrinking the amount the payment plan would spread.
Your drug costs are low, or steady and affordable. This is where the program can actively leave you worse off at year end. Consider a simplified case of flat $200 a month in out-of-pocket costs, $2,400 for the year. The payment plan turns a predictable $200 into this:
| Month | Bill from the plan |
|---|
| January | $200.00 |
| February | $18.18 |
| March | $38.18 |
| April | $60.40 |
| May | $85.40 |
| June | $113.98 |
| July | $147.31 |
| August | $187.31 |
| September | $237.31 |
| October | $303.98 |
| November | $403.98 |
| December | $603.98 |
The total is still $2,400. But the spring looks cheap and December costs three times what paying cash would have cost, in the same month as holiday spending and right before January's new deductible resets. Nothing went wrong. That is the formula working as designed on a cost pattern it was not built for.
You are signing up after September, or you simply do not want to change how you pay. The pharmacy stops taking your money, your plan starts billing you, and you still owe for drugs you already took home.
One risk is not on the Medicare.gov list. You will now get two bills from your plan every month, the premium and the payment plan bill. Medicare.gov is explicit about the order: "Always pay your health or drug plan monthly premium first (if you have one), so you don't lose your drug coverage." Missing the payment plan bill gets you removed from the payment plan. Missing the premium can cost you the coverage.
Auto-Renewal Into 2027, and What Open Enrollment Does to It
CMS finalized automatic renewal in the Contract Year 2026 Medicare Advantage and Part D final rule, now codified at 42 CFR 423.137(d)(10)(iv). The rules for the turn into 2027:
- If you were in the payment plan in 2026 and you keep the same Part D plan, your participation renews for 2027 automatically. You do not re-apply. Your plan must send a renewal notice after the annual election period closes on December 7 and before the plan year begins, telling you that participation will renew, reminding you that you can opt out at any time, and including next year's terms and conditions.
- If you switch Part D plans or Medicare Advantage plans for 2027, your participation ends with your old plan. Automatic renewal does not follow you. You have to opt in again with the new plan, and nobody will do it for you. This is the single most common way people lose the payment plan without meaning to.
- A 2026 balance does not vanish on January 1. You still owe it, and your old plan keeps billing it.
- Opting out is always available. A plan must process a voluntary termination request within 3 calendar days.
Open enrollment for 2027 Medicare coverage runs October 15 to December 7, 2026. If you are shopping plans, check what each plan's drug costs would actually be before counting on the payment plan to make an expensive plan manageable.
How to Sign Up
- Rule out the programs that save real money first. Check Extra Help and your state's Medicare Savings Program. If you qualify for either, start there.
- Price your drugs under your plan. Use the plan finder at medicare.gov, or call your plan and ask what each drug will cost you for the year.
- Contact your Part D plan or Medicare Advantage plan with drug coverage. Only your plan can enroll you. There is no central sign-up page at Medicare.
- Apply before you need it if you can. Request it during open enrollment and it takes effect with your first month of coverage, giving you all 12 months of runway.
- If you need it mid-year, your plan has to move fast. It must process an in-year election request and send an approval notice within 24 hours.
- If a delay would be dangerous, ask for a retroactive election. If waiting could seriously jeopardize your life, health, or ability to regain maximum function, you can pay at the pharmacy and request retroactive inclusion within 72 hours of pickup. Your plan then has 45 calendar days to reimburse the cost sharing you paid.
- Watch for the confirmation letter, then expect two separate bills each month.
Frequently Asked Questions
Does the Medicare Prescription Payment Plan save money?
No. Medicare.gov says it plainly: the option "doesn't save you money or lower your drug costs." It changes the timing of payments, nothing else. There is no cost to participate and no interest or late fees, so it does not cost extra either.
How much will I pay each month in 2027?
It depends on your drug costs and the month you join, and it changes month to month. The absolute ceiling for a full calendar year is $2,400, the 2027 out-of-pocket cap, which works out to $200 a month if you join in January and hit the cap early. You will never be billed more than you would have paid at the pharmacy.
Can I use the payment plan if I get Extra Help?
You can, since anyone with Medicare drug coverage is eligible. You almost certainly should not. Extra Help holds 2027 copays to $5.80 for generics and $14.40 for brand-name drugs for full-subsidy enrollees between 100 and 150 percent of poverty, and lower for full-benefit dual eligibles. There is very little left to spread, and Medicare.gov lists Extra Help eligibility as a reason the payment plan may not be right for you.
What happens if I miss a payment?
Your plan sends a reminder, and you get a grace period of at least two months to pay the overdue balance and stay in the program. The grace period carries into the next calendar year if the missed payment falls at the end of a year. If you still have not paid, the plan terminates your participation and must send a termination notice within 3 calendar days after the grace period ends. You can be reinstated if you show good cause, such as a serious illness or a death in the household, and pay what is overdue.
If I am removed, or I leave, do I lose my drug coverage?
No. Neither touches your Part D or Medicare Advantage enrollment. You can leave at any time by contacting your plan, which must process the request within 3 calendar days. You still owe the balance either way, with no interest or fees, and your plan has to keep billing it in monthly amounts no larger than the formula allows for the rest of the plan year. It may offer a lump-sum payoff but cannot require one. New prescriptions go back to being paid at the pharmacy.
Does the plan premium count toward the $2,400 cap?
No. Premiums are billed separately, do not count toward the out-of-pocket cap, and are never part of the payment plan bill. Pay the premium first.
Do I have to sign up again for 2027?
Not if you are staying with the same plan. Participation renews automatically for 2027 unless you opt out, and your plan sends a renewal notice between December 7, 2026 and the start of the plan year. If you change plans for 2027, your participation ends and you must opt in with your new plan.
Sources
- CMS, Calendar Year 2027 Medicare Advantage and Part D Rate Announcement (April 6, 2026), Table V-2, for the $2,400 out-of-pocket cap, the $700 deductible and the 2027 Extra Help copays.
- Medicare.gov, "What's the Medicare Prescription Payment Plan?" and its "Before using this payment option" and "Using this payment option" pages.
- Section 1860D-2(b)(2)(E) of the Social Security Act, added by the Inflation Reduction Act of 2022, and 42 CFR 423.137.
- CMS, Medicare Prescription Payment Plan Final Part One Guidance, sections 30.1, 30.2, 80.1 and 80.2.2.
- CMS, Contract Year 2026 Policy and Technical Changes final rule (CMS-4208-F), 90 FR 15915, for automatic renewal and the 3-calendar-day opt-out requirement.
CMS has not published the 2027 Part B premium, Part B deductible, or the 2027 Extra Help and Medicare Savings Program resource limits as of October 27, 2026. Figures above are the ones CMS has finalized. This page is informational and is not affiliated with any government agency or insurance company.
