CMS’s 2027 Medicare Part D National Average Monthly Bid Amount fact sheet, published July 28, 2026, put a number on something drug-plan insurers had been signaling for months: the national average monthly bid amount for 2027 is $296.05, up from $239.27 in 2026. That’s a roughly 24% jump in what plans expect basic Part D coverage to cost, and it’s landing the same year the federal subsidy that had been propping standalone premiums down is going away.

That subsidy — the Part D Premium Stabilization Demonstration — was supposed to run through 2027. CMS is ending it a year early, at the close of 2026, and the agency’s own estimates say a lot of people are going to feel it. We covered the 2027 Medicare Part B premium and Social Security COLA squeeze back in September, but that piece never touched Part D or Medicare Advantage drug coverage. This is the other half of the Medicare cost story for next year, and final plan-level numbers are due any day now.

Quick Verdict

2027 national average bid amount	$296.05, up ~24% from $239.27 in 2026
2027 base beneficiary premium	$41.33, up from $38.99 (about 6%, capped by law)
What’s ending	The Part D Premium Stabilization Demonstration, discontinued a year early after 2026
Who’s affected	Standalone Prescription Drug Plan (PDP) enrollees, not most Medicare Advantage members
Preliminary premium impact	CMS estimates ~45% of PDP enrollees see $11-$20/month increases; ~30% under $10; ~25% flat or lower
2027 deductible	$700 (up from $615)
2027 out-of-pocket cap	$2,400 (up from $2,100)
Drug price relief	15 more drugs get CMS-negotiated prices in 2027, cutting costs 38%-85% on those medications
Open enrollment	Oct. 15 - Dec. 7, 2026, for coverage starting Jan. 1, 2027
When you’ll see real numbers	CMS posts final plan-by-plan premiums in its landscape files mid-to-late September, right before enrollment opens

What Is the Part D Premium Stabilization Demonstration?

It’s a temporary CMS program, launched in 2025, that paid drug plan sponsors to keep standalone Part D premiums artificially low while the Inflation Reduction Act’s benefit redesign shifted more financial risk onto insurers. In 2025 it cut the base premium by $15 a month and capped increases at $35; in 2026 that shrank to a $10 cut and a $50 cap. CMS is ending it after 2026, a year ahead of schedule, saying plan sponsors now have enough experience pricing the redesigned benefit on their own.

That’s the mechanism. Here’s the money: the demonstration cost about $9.8 billion over its two years and, per CMS’s own accounting, shaved roughly $26 off the average monthly PDP premium in 2025 and $16 in 2026. Take that support away and the bids insurers submitted for 2027 reflect what they actually think coverage costs — which is most of why the national average bid amount jumped 24% in a single year instead of drifting up a few points like it usually does.

Why Your Actual Premium Might Not Jump 24%

Here’s the part worth sitting with, because the 24% headline number and what you’ll actually pay are two different things.

The national average monthly bid amount ($296.05) is what CMS uses to calculate the base beneficiary premium — and that figure is capped by law. Under the Inflation Reduction Act, the base beneficiary premium can’t grow more than 6% year over year through 2029. That’s why it’s only moving from $38.99 to $41.33. The 24% bid jump shows up in the underlying cost of coverage; the statutory cap absorbs most of it at the national level.

Individual plan premiums aren’t capped the same way, though. Each insurer sets its own premium based on its own bid, and with the demonstration’s per-plan increase caps also disappearing, there’s nothing stopping a specific plan from passing through a much bigger increase than the 6% base premium implies. CMS’s own preliminary estimates, cited by outlets tracking the rate filings, put the spread at roughly:

1. About 45% of standalone PDP enrollees face a monthly increase somewhere in the $11-$20 range.
2. About 30% see an increase under $10 a month.
3. The remaining roughly 25% get a flat premium or a decrease, typically because they’re already on a lower-bid plan or shift plans during enrollment.

None of that is your actual number. It can’t be, yet — plan-specific premiums for 2027 aren’t public until CMS releases its landscape files.

The Other Part D Changes Landing in 2027

Premiums aren’t the only thing moving. A few structural numbers shift too, all part of the multi-year Inflation Reduction Act phase-in:

• Standard deductible: $700, up from $615 in 2026. That’s what you pay before your plan starts sharing drug costs.
• Out-of-pocket cap: $2,400, up from $2,100 in 2026 (the cap started at $2,000 when this redesign first took effect in 2025). Once your covered drug costs — deductible plus copays and coinsurance — hit $2,400, you pay $0 for the rest of the year. Premiums don’t count toward that cap.
• Fifteen more drugs get Medicare-negotiated prices in 2027, on top of the first round that took effect this year. Prices on this batch — which includes GLP-1s like Ozempic and Wegovy along with COPD, cancer, and diabetes medications — are dropping 38% to 85%, an average cut of about 44%, according to AARP’s breakdown of the announcement. Roughly 5.3 million beneficiaries use these drugs, and the price cuts apply automatically — no enrollment action needed to get them.

That last point matters more than it sounds like it should this year: a higher deductible and out-of-pocket cap raise your ceiling, but lower negotiated prices on drugs you’re already taking can offset a real chunk of that before you ever hit the ceiling.

Medicare Advantage vs. Standalone Part D for 2027

If you’re on a Medicare Advantage plan with drug coverage bundled in (an MA-PD plan) rather than a standalone PDP, most of this doesn’t touch you directly. Most Medicare Advantage plans are expected to keep offering $0 premiums in 2027 — insurers subsidize the drug benefit with money from the rest of the plan, which is exactly why the standalone PDP market is the one absorbing this subsidy’s expiration. Medicare Advantage out-of-pocket limits for 2027 sit at $9,850 in-network and $14,800 combined in- and out-of-network, separate from the Part D deductible and cap figures above.

That’s not a reason to assume Medicare Advantage is automatically the better deal — network restrictions, prior authorization, and which specific drugs a plan covers all matter more than the premium line. But if you’re comparing options this enrollment season and your standalone PDP premium just jumped $15 or $20, it’s worth actually running an MA-PD plan against your current setup instead of assuming a bundled plan is worse because it used to have looser drug formularies.

When Do I Find Out My Real 2027 Premium?

Not yet, and that’s by design, not delay. CMS’s own fact sheet says it will publish the full Medicare Advantage and Part D landscape files — the plan-by-plan premiums, deductibles, and formularies you actually shop from — in mid-to-late September, once every plan sponsor has finalized its 2027 offerings. That’s a tight window before open enrollment opens Oct. 15 and runs through Dec. 7, 2026, for coverage that starts Jan. 1, 2027.

Practically: everything in this piece is the national picture. Your plan’s actual premium could track the 6% base-premium increase, land in that $11-$20 middle band, or go the other way entirely. You won’t know until the landscape files post, and once they do, you’ve got about a month to compare before enrollment closes.

How to Prepare Before the Numbers Post

• Don’t assume your current plan’s premium stays put. If your PDP was priced under the demonstration’s caps the last two years, 2027 is the first year that floor is gone.
• Check your specific drugs against the newly negotiated list. If you’re on one of the 15 drugs getting a negotiated price cut, your actual out-of-pocket cost could drop even if your premium rises — worth knowing before you assume a plan switch is necessary.
• Compare MA-PD against standalone PDP once the landscape files are out, not before. Premium alone won’t tell you which one costs less for your specific prescriptions.
• Budget for the higher end of the range if you’re on a fixed income. Between this and the Part B premium increase already squeezing next year’s Social Security COLA, healthcare costs are eating a bigger share of retirement income in 2027 than they did this year. A budgeting tool built for tight margins can model a $15-$20 monthly hit against a fixed budget faster than doing it by hand.
• Watch for medical bills that don’t match what you expected to owe. If a higher deductible year catches you off guard, know your rights around medical debt showing up on your credit report before a drug-cost surprise turns into a collections problem.
• Don’t confuse this with ACA marketplace open enrollment, which runs on a different calendar and has its own double-digit premium story for 2027. If you’re under 65 and on a marketplace plan, that piece — not this one — is the one that applies to you.

The Bottom Line

The 24% jump in the national average bid amount is real, but it’s not what most people will pay — the base beneficiary premium is capped at a 6% increase by law, and CMS’s own estimates put the typical standalone plan increase at $11 to $20 a month for close to half of enrollees, with plenty seeing less or nothing at all. What’s actually changing everyone’s math is the subsidy that’s disappearing after propping premiums down for two years, a higher deductible and out-of-pocket cap, and a fresh round of negotiated drug prices that could offset some of the damage depending on what you take. None of it is final until CMS posts the landscape files in the next few weeks. Once it does, you’ll have about a month before Dec. 7 to actually compare, not guess.

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2027 national average bid amount, base beneficiary premium, and de minimis figures from CMS’s official fact sheet, July 28, 2026. Premium Stabilization Demonstration details and cost figures from Healthcare Dive and PBS NewsHour. Premium increase estimates and subsidy-ending context via Forbes. Negotiated drug price details from AARP. Open enrollment dates from CMS. Deductible and out-of-pocket cap figures reflect CMS’s published 2027 Part D parameters. Plan-specific premiums aren’t final until CMS’s landscape files post; verify your own plan’s numbers once they do.