Medicare Part D in 2027: The New Out-of-Pocket Cap and What It Means

Medicare Part D changed more in 2025 than it had in the previous decade — and the 2026 and 2027 plan years continue the IRA (Inflation Reduction Act) rollout. The headline change: a hard $2,000 annual cap on out-of-pocket drug costs for Medicare Part D beneficiaries. For anyone taking expensive brand-name or specialty medications, that cap is one of the most consequential Medicare changes in a generation.

Here’s what Part D looks like in 2027 and how to make the right plan choice.

The 2027 Part D baseline

• Out-of-pocket maximum: $2,000 annually, carried forward from 2025 under the IRA
• Standard deductible: $615 (national benchmark; some plans use $0)
• National base beneficiary premium: $38.99 (used for late enrollment penalty math, not the actual plan premium)
• Catastrophic coverage phase: Eliminated. Once you hit the $2,000 cap, you pay nothing more for covered drugs for the rest of the calendar year.
• Medicare Prescription Payment Plan: Continues — you can spread out-of-pocket costs across the calendar year in monthly payments instead of paying large copays upfront.

What the $2,000 cap actually means

Before 2025, Part D members on expensive medications could pay $15,000+ a year out of pocket after Medicare’s catastrophic threshold kicked in. The IRA cap eliminates that entirely. Once you hit $2,000 in out-of-pocket drug costs for the year, you’re done.

For most beneficiaries taking only generics, you’ll never hit the cap. Generic Part D drugs are often $0-$10 per fill. If you take 4-5 generics, your annual out-of-pocket might be $200-$500. The cap is irrelevant to you.

For beneficiaries taking brand-name medications, the cap changes the plan-choice math fundamentally. A brand-name drug at a $40 copay for 12 monthly fills = $480. Three brand-name drugs = $1,440. The cap starts to matter.

For beneficiaries on specialty drugs (biologics, oncology, HIV, Hepatitis C), you’ll typically hit the cap in February or March and pay nothing further for the rest of the year. Pre-2025, the same regimens could cost $10,000-$20,000 annually out of pocket.

How to compare Part D plans in 2027

The right Part D plan depends almost entirely on your specific prescription list. Two plans with identical premiums can have wildly different total annual costs depending on how they tier each of your medications.

Step 1: List every prescription you take

Include the drug name, dosage, and how often you take it. Include PRN (as-needed) meds too — they still affect formulary tier placement.

Step 2: Use Medicare Plan Finder with your list

At medicare.gov/plan-compare, enter your drugs and preferred pharmacy. The tool calculates total annual cost for each plan — premium + deductible + copays + any coverage gap exposure. This is the single highest-value hour you can spend during AEP.

Step 3: Verify pharmacy network

Plans have “preferred” and “standard” pharmacies. Using a preferred pharmacy typically saves $5-$15 per fill. If you use a specific pharmacy (local independent, chain, or mail-order), confirm it’s preferred-tier under the plan.

Step 4: Check specialty drug tiers specifically

If you take any Tier 5 specialty drug, the plan’s specialty drug cost-sharing matters — but the $2,000 cap means you’ll hit catastrophic protection quickly regardless. For specialty-drug users, formulary coverage (yes/no) matters more than tier placement.

Where Medigap + Part D vs. Medicare Advantage differ

If you’re on Medigap (Medicare Supplement), Part D is a separate standalone plan. See our Plan G guide for how Medigap and Part D work together.

If you’re on Medicare Advantage, prescription drug coverage is usually bundled into the MA plan (called MAPD). The $2,000 out-of-pocket cap applies here too. When comparing MA plans, prescription drug cost is a major variable — the plan-by-plan math changes dramatically based on what you take.

Late enrollment penalty

If you went 63+ days without creditable prescription drug coverage after you became Medicare-eligible, Medicare adds a Late Enrollment Penalty to your Part D premium for life. For 2027 it’s calculated as 1% of the national base beneficiary premium ($38.99) per uncovered month, rounded to the nearest $0.10.

Example: 24 uncovered months = 24% penalty = $9.40/month added for life. That’s $113/year forever. The lesson: enroll in Part D (or confirm creditable coverage from employer or VA) as soon as you’re Medicare-eligible.

Our Part D penalty calculator will show you the exact penalty for your situation.

Extra Help (Low Income Subsidy)

Beneficiaries with limited income and assets qualify for Extra Help, which subsidizes Part D premiums, deductibles, and copays. In 2027 Extra Help eligibility extends to individuals up to 150% of FPL (~$23,500 annual income) with asset limits. If you qualify, the Part D penalty is typically waived too.

Apply through the Social Security Administration at ssa.gov/medicare/part-d-extra-help. See our Extra Help explainer for details.

Where to go from here

If you’re weighing Part D plans for 2027 and want someone to run the plan-finder comparison with your specific drug list, our team does this routinely during AEP. The comparison is free; so is enrollment help. For broader Medicare context, see our Medicare hub or walk through our eligibility checker.