Medicare Part D in Ohio: How Drug Coverage Works and How to Pick the Right Plan

If you have Medicare, prescription drug coverage is not automatic. You have to actively choose a Part D plan — or get drug coverage through a Medicare Advantage plan — and the choice you make affects what you pay at the pharmacy every month. With dozens of plans available across Ohio, picking the right one for your specific prescriptions is worth taking seriously.

Here is how Medicare drug coverage actually works, and what Dayton-area Medicare beneficiaries should know before enrolling.

How Part D Works

Medicare Part D is prescription drug coverage delivered through private insurance plans that contract with Medicare. You pay a monthly premium (which varies by plan), an annual deductible — no plan may charge more than $615 for 2026 — and a share of drug costs at the pharmacy through copays or coinsurance (CMS Final CY 2026 Part D Redesign Program Instructions). If you have Original Medicare plus a Medigap supplement, you need to add a standalone Part D plan for drug coverage. If you have Medicare Advantage, drug coverage is usually bundled in — you do not need a separate Part D plan.

The Four Coverage Stages

Part D has a tiered cost structure that changes based on how much you and your plan spend on your drugs during the year. In the deductible stage, you pay full drug costs until you meet your plan’s deductible — many plans offer zero deductibles on preferred generics. In the initial coverage stage, you pay 25% coinsurance under the defined standard benefit while the plan and drug manufacturers cover the rest. This stage ends once your out-of-pocket spending reaches the annual threshold. Historically, this was followed by the “donut hole” coverage gap, but under the Inflation Reduction Act, that gap has been eliminated. Out-of-pocket costs are now capped annually — the cap was $2,000 for 2025 and is $2,100 for 2026, after which you pay nothing for covered drugs for the rest of the year. Once you reach the out-of-pocket cap, you enter catastrophic coverage with minimal additional cost-sharing for the rest of the year.

Why Formularies Matter: Check Your Specific Drugs

A formulary is the list of drugs a plan covers, organized into tiers. Generic drugs land on lower tiers with lower copays. Brand-name and specialty drugs sit on higher tiers with higher cost-sharing. If your specific medications are not on a plan’s formulary, or are placed on an expensive tier, you may pay far more than you expected at the pharmacy.

The plan with the lowest monthly premium may end up costing you significantly more overall than a slightly more expensive plan that covers your drugs at favorable tiers. Before enrolling in any plan, use Medicare’s Plan Finder at Medicare.gov. Enter your specific prescriptions — drug names, dosages, and frequency — and the tool shows your estimated annual total cost under each plan available in your area. That number is the meaningful comparison, not the premium alone.

Choosing a Part D Plan in Ohio

Ohio residents in the Dayton metro typically have a couple dozen Part D plan options, though the exact number changes annually by county. Check the current list for your ZIP code on Medicare.gov. Plans from carriers like Humana, CVS SilverScript, UnitedHealthcare AARP, and Cigna are commonly available. Beyond your estimated annual drug cost, also check which pharmacies are in each plan’s preferred network. Many plans offer lower copays at preferred pharmacies, and your local Kroger pharmacy, Walgreens, or independent may or may not be on that preferred list.

The Late Enrollment Penalty

If you do not enroll in Part D when you are first eligible for Medicare and go more than 63 consecutive days without creditable drug coverage — coverage from an employer plan or other source that meets Medicare’s standards — you face a permanent late enrollment penalty. The penalty equals 1% of the national base beneficiary premium for each month you went without coverage, added to your premium for as long as you have Medicare. Someone who waits two years ends up paying a 24% premium surcharge permanently. Even if you take very few prescriptions, enroll in Part D when eligible and choose the lowest-cost plan if you rarely use medications.

Extra Help: The Low Income Subsidy

If your income and assets fall below certain thresholds, you may qualify for the Extra Help program, also called the Low Income Subsidy (LIS). Extra Help pays most or all of your Part D premium and reduces drug copays to just a few dollars per prescription. Individual income up to 150% of the federal poverty level may qualify; the dollar figure is updated annually. The program is administered by the Social Security Administration. If you think you or a family member might be eligible, it is worth applying — many people who qualify never use it.

Part D vs. Medicare Advantage Drug Coverage

If you are enrolled in a Medicare Advantage plan, you generally receive drug coverage through the Advantage plan rather than a standalone Part D plan. Advantage plan formularies and cost-sharing structures differ from standalone Part D, so the same analysis applies: verify that your specific medications are covered at reasonable tiers before choosing a plan. A common mistake is enrolling in an Advantage plan for its zero premium and later discovering that key medications are on a high-cost tier or excluded from coverage entirely.

Review Your Part D Plan Every Year

This is the step most Medicare beneficiaries skip. Plan formularies, premiums, and preferred pharmacy networks change annually. The Annual Enrollment Period runs October 15 through December 7 each year — this is your window to switch plans if a better option is available. Every October, run your prescriptions through Medicare’s Plan Finder again. It takes about 20 minutes and can save several hundred dollars or more per year. If you would rather have someone review your options with you before the enrollment deadline, our Beavercreek team is glad to help.

Sources

• CMS — Final CY 2026 Part D Redesign Program Instructions
• Medicare.gov — Part D plan comparison and Extra Help

This article is general educational information, not individualized financial, tax, or insurance advice. Medicare and tax figures are adjusted annually — confirm current-year amounts with the agency or your plan documents before acting on them.