Part D drug cap estimator

How does the 2026 cap work?

Since 2025, every Medicare drug plan, standalone or part of a Medicare Advantage plan, stops charging you for covered drugs once your own out-of-pocket spending reaches the yearly cap. In 2026 the cap is $2,100. The year has a deductible phase (up to $615 in 2026, and some plans charge less or none), then you share costs with your plan until you reach the cap, then you pay nothing for covered drugs. There is no longer a gap between those phases.

The cap counts what you pay at the pharmacy for drugs on your plan's drug list. It doesn't count your monthly premium, drugs your plan doesn't cover, or drugs bought outside your plan. Covered insulin is limited to $35 for a month's supply, and those payments count toward the cap. In rural Oklahoma, where the nearest pharmacy may be a long drive, check that a plan's network includes a pharmacy you can reach, or that it offers mail order for your maintenance drugs.

IHS, tribal and urban Indian pharmacies

Many American Indian and Alaska Native Oklahomans fill prescriptions through the Indian Health Service, a tribal health system or an urban Indian clinic. CMS's Part D coordination of benefits guidance says that since January 1, 2011, help with Part D cost sharing from I/T/U pharmacies counts toward the out-of-pocket threshold, and that Part D plans must offer network contracts to all I/T/U pharmacies in their service area. Drug coverage through I/T/U also counts as creditable coverage, so it protects you from the Part D late penalty. See tribal health and Medicare in Oklahoma and the penalty calculator.

Can I spread the cost over the year?

If an expensive prescription would have you pay most of the cap in January, you can join the Medicare Prescription Payment Plan through your drug plan. You then pay nothing at the pharmacy and get a monthly bill from your plan instead. The total is the same; the bills are spread over the rest of the year. The calculator's monthly figure assumes you join for the whole year; joining later in the year spreads the cost over fewer months.

The payment plan helps most when costs come early and are high. If you qualify for Extra Help, Extra Help usually helps more, because it lowers what you owe instead of spreading it out.

Who gets Extra Help in Oklahoma?

Extra Help is the federal program that lowers Part D costs for people with limited income and resources. With Extra Help you pay no deductible and, in 2026, no more than $5.10 for a generic or $12.65 for a brand-name drug. People with full SoonerCare and income at or below the federal poverty level pay no more than $1.60 and $4.90. Extra Help can also pay all or part of your drug plan's premium.

• Automatic for many Oklahomans. If you have full SoonerCare, are in a Medicare Savings Program (QMB, SLMB or QI-1, which OHCA calls SoonerCare Supplemental), or get Supplemental Security Income, Medicare gives you Extra Help without a separate application. Read SoonerCare and Medicare.
• Others apply with Social Security. In 2026 the income limit is $23,940 a year for one person or $32,460 for a married couple, and resources must be under $16,590 or $33,100. That is higher than Oklahoma's Medicare Savings Program resource limit, so some Oklahomans with too much in savings for a savings program still qualify for Extra Help. Check both with the savings programs screener.
• A chance to change plans. People with Extra Help can switch to a different drug plan once a month in some situations; see enrollment periods.

For how drug plans work in Oklahoma and what to compare, see Medicare Part D in Oklahoma. For 2027, 9 standalone Part D plans are offered statewide (CMS plan data), and the cap rises; see 2027 Part D amounts. To look at plans offered where you live, you can see plans for your ZIP code.

Sources

• Medicare.gov — Costs for Medicare drug coverage
• Medicare.gov — Medicare Prescription Payment Plan
• Medicare.gov — Help with drug costs (Extra Help)
• Social Security — Extra Help with Medicare prescription drug costs
• CMS — CY 2026 resource and cost-sharing limits for the Low-Income Subsidy (PDF)
• CMS — Medicare Prescription Drug Benefit Manual, Chapter 14, Coordination of Benefits (IHS and tribal coverage and TrOOP) (PDF)
• Indian Health Service — Letter on the Medicare Part D creditable coverage letter, October 15, 2026 (PDF)
• Oklahoma Human Services — Appendix C-1, Maximum Income, Resource, and Payment Standards
• Oklahoma Health Care Authority — SoonerCare Supplemental

Frequently asked questions