7.4 Medicare Prescription Payment Plan (Drug-Cost Smoothing)

Why the Medicare Prescription Payment Plan Matters on the AHIP Exam

The Medicare Prescription Payment Plan (M3P), sometimes called "drug-cost smoothing," is the newest major feature in Part D — it launched January 1, 2025 and is fully operational for plan year 2026. Because it is new, CMS has made it a mandatory disclosure item for every Part D sponsor, which pulls it directly into Module 4 (Marketing & Sales Compliance) as well as Module 3. AHIP exam-writers favor testing brand-new CMS requirements in the year or two after launch, precisely because agents are most likely to have outdated or incomplete knowledge — expect at least one M3P question.

What M3P Actually Is

M3P is not insurance, and it is not a discount. It is strictly a cash-flow tool: it lets a Part D enrollee (in either a standalone PDP or an MA-PD) elect to pay $0 at the pharmacy counter for covered prescriptions and instead receive a monthly bill from their plan that spreads their out-of-pocket drug costs evenly across the remaining months of the calendar year. The total dollar amount the beneficiary owes does not change — M3P only changes when they pay it, not how much. This distinction is the single most-tested concept in this section.

Who Can Use It

Any Part D enrollee is eligible to opt in — there is no income or medical requirement. However, it is most valuable for beneficiaries who expect a large drug cost early in the year (for example, someone facing a $2,100 specialty drug bill in January who would otherwise have to pay that full amount at the pharmacy in one shot, rather than smoothing it across the months ahead).

How Enrollment Works

• Participation is voluntary and free — there is no fee to opt in.
• Beneficiaries opt in through their plan, not through Medicare.gov directly — by phone or through the plan's website.
• Beneficiaries can opt in during the Annual Enrollment Period (AEP, October 15 – December 7) or at any point during the plan year, but only prospectively — M3P cannot retroactively reimburse a beneficiary for costs they already paid at the pharmacy before opting in.
• Standard elections must be processed before the next fill; urgent elections (submitted close to a pharmacy pickup) must be processed within 24 hours so the beneficiary is not stuck paying full price while waiting on paperwork.

The Monthly Cap Formula

All Part D plans must use the same CMS-mandated formula to calculate a participant's monthly bill:

Monthly Payment = (Remaining Balance + New Out-of-Pocket Costs Incurred) ÷ Months Remaining in the Plan Year

Because the formula divides by the number of months left in the year, the earlier a beneficiary opts in, the smaller each monthly payment becomes — this is the single most important planning point for agents to communicate.

An agent who waits to mention M3P until AEP in October or November is doing their client a disservice if that client is likely to hit a high drug cost early the following year — the earlier the opt-in, the smoother (and smaller) each installment.

Compliance and Marketing Requirements

Since 2025, CMS requires every Part D plan sponsor to send an annual notice to all enrollees describing the M3P option, and to make information about it available at the point of enrollment and at the pharmacy counter when a beneficiary's out-of-pocket cost for a single fill would exceed a CMS-set threshold. Agents and brokers must be able to explain M3P accurately as part of their marketing and enrollment conduct obligations — this is the reason M3P knowledge is tested alongside Module 4's marketing compliance rules, not treated purely as a Module 3 product detail.

Important Limits and Traps

• M3P applies only to covered Part D drug costs — it does not cover or smooth monthly premiums, which are still billed separately and on their own schedule.
• M3P does not reduce a beneficiary's total annual out-of-pocket obligation — the 2026 $2,100 cap still applies in full; M3P only changes the payment cadence.
• If a beneficiary fails to pay their monthly M3P bill, the plan must provide a grace period before removing them from the program; non-payment can lead to removal from M3P but does not cause loss of Part D coverage itself.
• If a participant switches plans mid-year (for example, during a valid SEP), any remaining M3P balance transfers to the new plan rather than being forgiven or restarted.

Exam Scenario

A client is diagnosed in February with a condition requiring a $2,100 specialty drug fill that same month. If she pays out of pocket immediately, she owes the full $2,100 at the pharmacy. If she opts into M3P before that fill, she instead owes $0 at the pharmacy and is billed roughly $2,100 ÷ 11 months remaining (March through December, since the fill occurred in February) — a materially smaller monthly hit, spread over the balance of the plan year, with the same total amount owed either way.