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What Oak Street Health's Medicare Information Guide Covers

Oak Street Health publishes a free informational guide designed to help people understand Medicare options available through their organization. The guide presents factual information about different Medicare plans and how they work, rather than steering readers toward a single option. This resource explains the basic structure of Medicare and shows how Oak Street Health's programs fit within the broader Medicare landscape.

The guide typically includes explanations of how Original Medicare operates, what Medicare Advantage plans offer, and how prescription drug coverage works. It walks through real-world scenarios showing how different people's healthcare needs might align with different coverage types. For example, someone managing diabetes might see a breakdown of how prescription coverage, specialist visits, and preventive care are handled under various plan structures.

Oak Street Health operates over 200 primary care clinics across more than 25 states, serving roughly 1 million patients. The organization focuses particularly on serving Medicare beneficiaries, which is why their educational materials concentrate on this population. The guide reflects information current to the time of publication, though Medicare rules do change annually.

The resource addresses common questions that arise during Medicare decision-making periods. It explains what happens during the annual enrollment periods when people can make changes to their coverage. It describes how out-of-pocket costs work and what factors differ between plan types. The guide does not determine whether any particular person should select any particular plan—it provides information to inform personal decision-making.

Practical Takeaway: Before reading the guide, make a list of your current healthcare needs: regular medications you take, doctors you see, hospitals you prefer, and any chronic conditions you manage. Having this information ready helps you understand how the guide's explanations apply to your specific situation.

Understanding Medicare Advantage Plans Explained in the Guide

Medicare Advantage plans, also called Part C, represent one major way to receive Medicare coverage. The guide explains that these plans are offered by private insurance companies that contract with Medicare. Rather than the federal government directly paying for your care through Original Medicare, the insurance company receives a set amount per month from Medicare and then provides your coverage.

The guide typically describes how Medicare Advantage plans bundle together Part A hospital coverage, Part B medical coverage, and usually Part D prescription drug coverage into a single plan. This is different from Original Medicare, where these are separate, and someone would need to purchase an additional Medigap or Part D plan separately. The consolidation means working with one insurance company and one set of rules, which the guide notes can simplify the process for some people.

One key distinction the guide usually explains is how Medicare Advantage plans use networks. Most plans require you to use doctors and hospitals within their network to receive full benefits. The guide explains what happens if you see an out-of-network provider: you may face higher costs or the service may not be covered at all. The guide typically walks through how to check whether your current doctors participate in a specific plan's network.

According to the Centers for Medicare & Medicaid Services, over 28 million people were enrolled in Medicare Advantage plans as of 2023, representing about 45% of all Medicare beneficiaries. The guide uses this context to explain that this coverage type has become a mainstream option. It may include information about cost-sharing structures, such as copays for doctor visits or coinsurance for hospital stays, and how these vary by plan.

The guide often addresses the additional benefits many Medicare Advantage plans offer beyond Original Medicare coverage. These may include dental, vision, hearing, fitness memberships, or telehealth services. Oak Street Health's guide typically explains which of these services their affiliated plans include.

Practical Takeaway: Write down your three most-visited doctors and the hospital you would choose if needed. When reviewing the guide's information about Medicare Advantage plans, use this list to research whether those providers participate in the network before considering enrollment.

How Original Medicare Differs From Other Coverage Types

The guide provides education about Original Medicare—the traditional fee-for-service program run directly by Medicare, a federal program. Understanding this option matters because it forms the foundation for understanding Medicare Advantage and other alternatives. Original Medicare consists of Part A, which covers hospital services, skilled nursing facilities, and some home health care, and Part B, which covers doctor visits, outpatient care, and certain preventive services.

One significant difference the guide usually highlights involves provider networks. Original Medicare has no network restrictions. You can see any doctor, specialist, or hospital that accepts Medicare, which covers roughly 96% of healthcare providers nationwide according to Medicare data. The guide contrasts this with Medicare Advantage plans, which typically restrict coverage to in-network providers except in emergencies or certain other circumstances.

The guide typically explains how costs work differently under Original Medicare compared to managed care plans. With Original Medicare, you pay a monthly Part B premium (set at $164.90 for most people in 2024), an annual deductible for Part B services ($240 in 2024), and then 20% coinsurance for most services after meeting your deductible. The guide notes that costs can be unpredictable because they depend on how many services you use each year. Some people use very few services and have low annual costs; others with significant healthcare needs may have much higher expenses.

The guide often addresses what Original Medicare does not cover. Medicare does not cover vision exams or glasses, dental care and dentures, hearing aids or exams for fitting them, or long-term custodial care in a nursing home or at home. The guide explains that people with Original Medicare can purchase supplemental Medigap policies from private insurance companies to cover some of these gaps, or they can add a Medicare Advantage plan, which offers bundled coverage.

For prescription drugs, the guide typically explains that Original Medicare requires separate enrollment in a Part D plan through a private insurance company. The guide walks through how Part D coverage phases work: you pay premiums and a deductible, then copays until you reach a certain spending threshold, then face a coverage gap, and eventually get catastrophic coverage for high costs.

Practical Takeaway: Calculate your estimated annual healthcare costs using the guide's information. If you rarely visit doctors, Original Medicare's low monthly premium might appeal to you. If you take multiple medications or see specialists regularly, add up estimated copays and coinsurance to compare total costs across coverage types.

Prescription Drug Coverage: What the Guide Explains About Part D

Prescription drug coverage under Medicare Part D represents a critical component of most people's healthcare planning, and Oak Street Health's guide typically provides substantial information about how it works. The guide explains that Part D is delivered through private insurance companies, not by Medicare directly. People with Original Medicare must choose and enroll in a Part D plan, while people with Medicare Advantage typically receive drug coverage through their Advantage plan.

The guide usually walks through the standard Part D benefit structure, which includes several distinct phases. First is the deductible phase, where you pay the full cost of prescriptions until you reach your plan's annual deductible amount (which varies by plan but is capped at $545 in 2024). Next is the initial coverage phase, where you pay copays or coinsurance and your plan pays its share until combined spending reaches a certain limit. Then comes the coverage gap, sometimes called the "donut hole," where your costs increase significantly. Finally, catastrophic coverage kicks in once you spend enough out-of-pocket.

The guide typically emphasizes that Part D plans vary significantly in which drugs they cover, what tier (cost level) they assign to specific medications, and what copays they charge. A medication you take might be covered under one plan but not another, or it might be covered but at a much higher cost. The guide usually includes information about how to compare plans using Medicare's online tools and how to review whether your current medications are covered before enrolling.

One important piece of information the guide usually covers involves generic versus brand-name drugs. Medicare data shows that about 70% of prescriptions filled in the U.S. are for generic medications, which typically cost significantly less than brand-name equivalents. The guide often explains how Part D encourages the use of generics and what happens if you prefer a brand-name drug that has a generic equivalent available.

The guide typically addresses special situations involving Part D coverage. This may include information about how Extra Help (a program for people with lower incomes) can reduce Part D costs, how to request exceptions if your doctor believes a non-covered drug is medically necessary, and what happens if you miss the initial enrollment deadline.

Practical Takeaway: Gather a list of all prescription medications you currently