Part D in 2027: The $700 Deductible, the $2,400 Cap, and the $35 Insulin Rule

Three Part D amounts change on January 1, 2027. The standard deductible rises. The yearly cap on what you pay for covered drugs rises. And the cap on insulin costs stays where it is. Each 2027 amount in this guide takes effect on January 1, 2027. None of them is in effect now.

The fall enrollment window, which runs to December 7, is when you pick the drug plan that these amounts will apply to. So this is the right time to learn the new numbers and check your plan against them. Our Paying for Care section holds our other cost guides, and our medications hub lists every drug page we publish.

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The $700 deductible

A deductible is what you pay for your drugs before the plan starts to share the cost. The standard Part D deductible for 2027 is $700 (Ledger A17). It is a maximum, not a fixed charge. Your plan may set its deductible at $700, below it, or at zero. Your plan's own papers state the amount that applies to you.

In 2026 the standard deductible is $615 (Ledger A9). So a member in a plan that charges the full standard deductible pays $85 more at the start of 2027 than at the start of 2026, before the plan begins to share drug costs.

Some plans leave set drugs out of the deductible. A plan may cover low-cost generics from the first fill, for example, and apply the deductible only to higher tiers. Check the drug list of any plan you weigh, drug by drug.

The $2,400 cap

After the deductible, you pay a share of each drug's cost. Your shares add up across the year. Once what you have paid for covered drugs reaches $2,400 in 2027 (Ledger A18), you pay $0 for covered drugs for the rest of the year.

In 2026 the cap is $2,100 (Ledger A10). The cap rises by $300 for 2027. For a person whose drugs are cheap, the cap may never come into play. For a person on one costly brand drug, the cap is the line that ends drug costs for the year. That person pays $300 more in 2027 than in 2026 before the line is reached.

The cap counts what you pay for covered drugs. It does not count your premium. It does not count drugs your plan does not cover and you pay for in full on your own.

The $35 insulin rule

Insulin has its own rule, and the rule does not change for 2027. You pay no more than $35 for a month's supply of each covered insulin product (Ledger A20). No deductible applies to insulin. In 2026 the same $35 cap holds (Ledger A12), so insulin users see no change on this line.

The $35 cap is per product. A person who uses two insulin products can pay up to $35 for each one, each month. The cap covers insulin under Part D. Insulin used in a pump that Part B covers has its own $35 cap under Part B rules.

Adult shots on the ACIP vaccine list also cost $0 under Part D in 2027 (Ledger A20).

The $41.33 figure is not your premium

CMS sets a national base beneficiary premium each year. For 2027 it is $41.33 a month (Ledger A19). This figure is a benchmark. CMS uses it to work out late enrollment penalties and income-based surcharges. Your plan sets its own premium, which can be lower or higher than $41.33.

Do not budget from the benchmark. Budget from the premium printed in your plan's own papers for 2027. Plans can move their premiums more than usual for 2027, since a federal program that held premiums down ends after 2026. Your plan sent a fall notice that lists its 2027 premium and its drug list changes. That notice is the source to trust for your own costs.

Who pays for what

• Medicare sets the Part D rules and the standard amounts in this guide, and pays part of the cost of the drug benefit. Original Medicare on its own does not cover most drugs you take at home.
• Your Part D plan pays its share of your covered drug costs after your deductible and cost shares, and pays in full once you reach the yearly cap.
• Medicaid: people who have both Medicare and Medicaid get their drugs through Part D, and most also get Extra Help with drug costs. Our guide on Extra Help in 2027 covers that help in full.
• Private pay: you pay your plan premium, your deductible up to your plan's amount, and your share of drug costs up to the yearly cap of $2,400 in 2027 (Ledger A18).

Sample situation

James is 76 and takes one brand drug that costs a lot each month. His stand-alone drug plan charges the full standard deductible. In January 2027 he pays the first $700 of his drug costs himself (Ledger A17). After that, he pays a share of each fill. His shares build through the spring. The deductible plus his later shares reach $2,400 in June (Ledger A18). From July to December, James pays $0 for that covered drug at the pharmacy. He still pays his plan premium each month, because the premium never counted toward the cap.

In 2026, the same drug use would have hit the cap sooner. His deductible was $615 (Ledger A9) and his cap was $2,100 (Ledger A10). The 2027 change costs James $300 more across the year before his drug costs stop: $85 more in deductible and $215 more in shares on the way to the higher cap. The math is $700 minus $615 is $85, and $2,400 minus $2,100 is $300 in total added cost, so $300 minus $85 is $215.

Steps to take this fall

• Read your plan's fall notice and find its 2027 premium and deductible.
• Check each drug you take against the plan's 2027 drug list and tier.
• If your drugs cost a lot, add up how the $700 deductible and the $2,400 cap would play out for you in 2027.
• Compare at least one other plan before December 7, the last day of the fall window.

Sources

• https://www.medicare.gov/health-drug-plans/part-d/basics/costs