Medicare Playbook

At Diversified Insurance Brokers, we help individuals navigate Medicare with confidence, clarity, and without the bias of being tied to a single carrier or plan type. The Medicare Playbook is our comprehensive guide to understanding how Medicare actually works — not in the abstract language of government publications, but in the practical terms that matter when you are making decisions about doctors, prescriptions, premiums, and the coverage structure you will live with for the rest of your retirement. Whether you are approaching age 65, already enrolled and reconsidering your structure, or reviewing coverage during the Annual Enrollment Period, this Playbook explains your options in plain language and provides the strategic framework we have used to help thousands of clients make decisions they are confident in. Our companion resource on what to know before you enroll in Medicare covers the specific enrollment timing rules, penalty structures, and 2026 cost figures in detail, and our Medicare services hub covers how Tonia and the Diversified team work with clients across the full Medicare planning process.

Medicare is not a single program. It is a layered system made up of Part A, Part B, Part C (Medicare Advantage), and Part D, each with its own rules, enrollment windows, penalties, and cost-sharing structure. When these pieces are not aligned correctly, the result can be unnecessary premiums, limited provider access, prescription drug surprises, or lifetime late enrollment penalties that follow you for decades. When structured properly, Medicare can provide stable, predictable coverage that protects both your health and retirement income. Many people turning 65 assume Medicare will “just handle everything.” Others are overwhelmed by the volume of marketing around Medicare Advantage plans, supplements, and drug coverage. The reality is that your Medicare strategy should be built around your doctors, your prescriptions, your travel habits, your risk tolerance, and your long-term financial goals. A healthy 65-year-old who travels frequently will not have the same optimal structure as someone managing multiple chronic conditions or planning to relocate. This Playbook walks you through these distinctions in plain English so you understand not just what each option is called, but how it functions in your actual retirement life.

One of the most consequential and misunderstood aspects of Medicare planning is timing. As of 2026, over 35 million Americans — approximately 51% of all eligible Medicare beneficiaries — are enrolled in Medicare Advantage plans. Many of them chose Advantage plans during their initial enrollment period and are happy with their coverage. But many others discover years later that they would prefer to move to a Medigap supplemental structure and find that medical underwriting now stands between them and the coverage they want. The initial Medicare structure decision is harder to reverse than it appears at the moment of enrollment. That is why understanding the full picture — options, trade-offs, enrollment windows, and long-term flexibility — before you commit is the foundation of the Medicare Playbook approach.

Medicare Coverage Structures Compared — What Each Path Delivers and What It Costs

The three primary Medicare coverage structures produce different costs, provider access, plan flexibility, and long-term switching options. Understanding how they compare is the starting point for every Medicare strategy conversation.

2026 cost figures reflect official CMS releases. Medicare Advantage premiums and benefits vary by plan, insurer, and geographic area. Medigap premiums vary by plan letter, insurer, state, and age at enrollment. Part D premiums and cost-sharing vary by plan and formulary. This table is educational and does not constitute insurance advice or a coverage determination. Individual plan details should be verified with the specific carrier before enrollment.

Part A and Part B — The Foundation of Every Medicare Strategy

Original Medicare, made up of Part A and Part B, forms the foundation of most Medicare strategies. Medicare Part A generally covers inpatient hospital care, skilled nursing facility care following a qualifying hospital stay, hospice, and certain home health services. Most people who have worked and paid Medicare taxes for 40 or more quarters pay no premium for Part A — but Part A does carry a $1,736 per-benefit-period hospital deductible in 2026, plus daily coinsurance of $434 for days 61 through 90. The per-benefit-period structure means multiple hospitalizations in one year can trigger multiple deductibles — a significant exposure that Medigap Plan G covers but Medicare Advantage plans address through their own copay structure. Medicare Part B covers outpatient care, physician services, diagnostic testing, durable medical equipment, preventive services, and medically necessary outpatient treatments. The 2026 standard Part B premium is $202.90 per month, with a $283 annual deductible. After the deductible, Original Medicare typically covers 80% of approved costs — leaving 20% coinsurance with no annual cap. That unlimited 20% exposure is why virtually all Medicare beneficiaries add either a Medigap policy or a Medicare Advantage plan. Our resource on is Medicare expensive covers the full cost-sharing picture across all parts and supplement options, helping buyers understand total out-of-pocket exposure before choosing a structure.

Medicare Supplement (Medigap) — Predictability and Provider Freedom

Medicare Supplement plans — commonly called Medigap — work alongside Original Medicare and pay the cost gaps Medicare leaves behind. There are ten standardized Medigap plan letters (A, B, D, G, K, L, M, N, plus C and F for those who enrolled in Medicare before January 1, 2020), each offering a defined set of benefits regardless of which insurer sells it. Plan G is the most popular Medigap plan in 2026, chosen by approximately 39% of all Medigap enrollees. Plan G covers all Medicare cost-sharing except the annual Part B deductible ($283 in 2026), meaning that once the deductible is met, the beneficiary pays nothing out of pocket for Medicare-approved services for the rest of the year — no copays, no coinsurance, no surprise bills from high-cost hospital stays or specialist visits. Plan N is a lower-premium alternative that adds small office and emergency room copays but retains broad coverage. Neither Plan G nor Plan N includes prescription drug coverage — a separate Part D plan must be purchased. Our resource on best Medicare supplement plans for seniors covers the plan letter comparison in detail and how to choose the right Medigap tier for your health profile and financial goals. The most important Medigap enrollment timing fact: the Medigap Open Enrollment Period is a 6-month window beginning the month you turn 65 and are enrolled in Part B. During this window, you have guaranteed issue rights — no carrier can deny you any Medigap plan sold in your state or charge you more because of health conditions. After this window closes, insurers in most states can apply medical underwriting, which means health changes after enrollment can limit your options if you try to switch plans or carriers. Our resource on Medicare supplement coverage for cancer treatment covers a scenario where the Medigap provider access advantage is most consequential — when specialist choice, cancer center access, and treatment facility flexibility matter most to a beneficiary facing a serious diagnosis.

Medicare Advantage — Bundled Coverage and the Trade-offs to Understand

Medicare Advantage plans — Part C — are offered by private insurers approved by Medicare and bundle hospital, medical, and usually prescription drug coverage into a single plan. As of early 2026, Medicare Advantage covers over 35 million Americans, representing approximately 51% of all eligible Medicare beneficiaries. The appeal is straightforward: many plans carry $0 premiums beyond the standard Part B premium, include extras like dental, vision, hearing, and fitness benefits not covered by Original Medicare, and provide a defined annual out-of-pocket maximum that caps the beneficiary’s total spending for the year. The trade-offs are equally specific: Medicare Advantage plans use provider networks. HMO plans typically require in-network providers and referrals for specialist care. PPO plans offer more flexibility but at higher cost for out-of-network services. Provider networks change annually — a physician who is in-network when you enroll may not be in-network the following year. Plans are tied to geographic service areas — if you relocate, you may need to change plans. Prior authorization requirements for some services can add administrative friction. Our resource on best-rated Medicare Advantage companies covers the carrier landscape and how to evaluate plan quality beyond the premium headline, and our resource on Medicare Advantage vs. Medicare Supplement comparison provides the full side-by-side framework for evaluating these two paths with your specific health profile, travel patterns, and financial priorities. Our resource on low-cost Medicare plans for retirees covers budget-focused strategies for both the Advantage and Medigap paths.

Part D Prescription Drug Coverage — The Coverage Everyone Needs

Medicare Part D provides prescription drug coverage through private plans that each maintain their own formulary — the list of covered drugs, the tier placement of each drug, and the preferred pharmacy network that determines cost. The diversity in Part D design is significant: the same medication can cost very different amounts depending on which plan’s formulary you are enrolled in. The 2026 Part D out-of-pocket cap is $2,100 — after reaching this annual threshold, Medicare pays 100% of covered drug costs for the remainder of the year, a major protection for beneficiaries on high-cost medications. Insulin costs are capped at $35 per month regardless of which Part D plan you are in. Adult vaccines are covered with $0 cost-sharing. Even if you do not currently take prescription medications, failing to enroll in Part D when you first become eligible — without other creditable drug coverage — triggers a permanent late enrollment penalty of 1% of the national base premium per month for every month without coverage. This penalty is permanent and adds to your Part D premium for as long as you are enrolled. Annual review of Part D is essential because formularies change every January 1 — a drug covered at a favorable tier this year may be reclassified next year. Our resource on Medicare Part D explained covers the formulary, tier structure, preferred pharmacy, and coverage gap mechanics in full detail, and our resource on how to choose the best Medicare plan provides the decision framework for selecting the right drug plan based on your current medication list rather than the plan’s premium alone.

Enrollment Periods — The Windows That Determine Your Premiums for Life

Medicare enrollment is not a single event — it is a series of defined windows, each with specific rules about who can enroll, what they can change, and what happens if they miss the window. The Initial Enrollment Period (IEP) is a 7-month window beginning three months before your 65th birthday month, including the birthday month, and extending three months after. Enrolling during the first three months of this window typically means coverage begins on the first day of the birthday month. Missing the IEP without qualifying employer group health coverage triggers the General Enrollment Period (January 1-March 31), with coverage starting July 1 — potentially a gap of six to eighteen months plus permanent late enrollment penalties on both Part B and Part D. The Annual Enrollment Period (AEP) runs October 15 through December 7 each year, allowing changes to Medicare Advantage and Part D plans that take effect January 1. The Medicare Advantage Open Enrollment Period (MA OEP) runs January 1 through March 31, allowing beneficiaries already enrolled in Medicare Advantage to switch to a different Advantage plan or return to Original Medicare once. Special Enrollment Periods (SEPs) are triggered by qualifying life events such as losing employer coverage, moving out of a plan’s service area, or other specific circumstances. Our resources on enroll in Medicare at 65 and how to avoid Medicare late enrollment penalties cover the enrollment timing rules and penalty avoidance strategies in detail, and our resource on Medicare enrollment mistakes to avoid covers the most expensive timing errors that new enrollees make — many of which are entirely preventable with structured guidance.

Working Past 65 — When Employer Coverage Changes the Equation

If you are still actively working at 65 and covered under an employer group health plan — either your own or your spouse’s — the Medicare enrollment rules change. Active employer group coverage at an employer with 20 or more employees qualifies you to delay Part B without penalty, using a Special Enrollment Period when you eventually leave active employment. However, the timing of that SEP is strict — you have eight months from when you lose the qualifying employer coverage to enroll in Part B without penalty. COBRA, retiree health coverage, and individual health plans do not qualify and will not protect you from the Part B late enrollment penalty. A particularly dangerous scenario involves small employers with fewer than 20 employees: at those employers, Medicare becomes the primary payer at 65, meaning your employer plan is secondary even if you haven’t enrolled in Medicare — creating a coverage gap where neither Medicare nor the employer plan will fully cover your bills. Our resource on Medicare enrollment for people still working covers the active employment coordination rules in detail, and our resource on HSA and retroactive Part A guide covers a related and frequently missed complication: once you enroll in any part of Medicare — including Part A — HSA contributions are no longer permitted, and Medicare’s retroactive Part A enrollment can reach back six months and disqualify contributions you made during that period, creating an unexpected tax liability.

Medicare and Social Security — The Coordination That Affects Your Premiums

Medicare and Social Security are separate programs with separate rules, but their financial consequences are tightly linked. Most Medicare beneficiaries have Part B and Part D premiums deducted automatically from their Social Security check — which means Social Security claiming timing affects whether you pay premiums out of pocket or through automatic deduction. More significantly, IRMAA surcharges on Part B and Part D are determined by your Modified Adjusted Gross Income from two years prior — meaning income decisions you make in the years leading up to Medicare eligibility directly affect your first-year Medicare premiums. A Roth conversion, a real estate sale, or a large IRA distribution in the year before Medicare enrollment can trigger IRMAA surcharges that add hundreds of dollars per month to Part B premiums. Coordinating Social Security claiming timing, IRA withdrawal sequencing, and Medicare enrollment timing creates a more efficient income and premium structure than treating each decision independently. Our resource on how Medicare and Social Security work together covers the full coordination framework between these two programs, and our resource on maximize Social Security benefits covers the claiming strategy framework that should be evaluated alongside — not separately from — the Medicare timing and IRMAA planning conversation. Our resource on Medicare calculator provides a modeling tool for estimating premium costs under different income and plan scenarios.

Medicare Does Not Cover Long-Term Care — A Gap That Requires a Separate Strategy

One of the most consequential Medicare misconceptions is the belief that Medicare will pay for extended care in a nursing home or memory care facility. Medicare does not cover custodial long-term care — the ongoing assistance with activities of daily living that constitutes the majority of long-term care services and costs. Medicare covers acute medical care, limited short-term skilled nursing following a qualifying hospital stay, and medically necessary home health care — but not extended custodial stays, dementia-related supervision, assisted living, or the routine personal care that most people associate with “long-term care.” Understanding this gap before Medicare enrollment allows time to evaluate strategies for funding extended care needs before a health event makes planning options narrower. Our resource on long-term care insurance services covers the range of strategies available — including traditional LTC insurance, hybrid life/LTC products, and annuity-based LTC riders — that are worth evaluating as part of a comprehensive retirement healthcare plan alongside Medicare.

Annual Review — Why Coverage Must Evolve With Your Needs

Medicare enrollment is not a one-time decision. Plan formularies change annually. Provider networks shift. Premiums adjust. A plan structure that worked well at 65 may be suboptimal at 72 when health needs, medications, and provider relationships have changed. The Annual Enrollment Period — October 15 through December 7 — is the annual opportunity to review and adjust Medicare Advantage and Part D coverage. Changes made during AEP take effect January 1. At a minimum, every Medicare beneficiary should review their Part D drug plan each AEP to ensure it still covers their current medications at the most favorable tier and through their preferred pharmacy. Medicare Advantage beneficiaries should verify their plan’s network still includes their primary care physician, key specialists, and preferred facilities. Medigap beneficiaries should verify that their plan letter still matches their utilization patterns and budget. Our resource on best independent Medicare broker covers how working with an independent broker who represents multiple carriers — rather than a single company’s agent — provides the unbiased comparison that makes annual review genuinely useful rather than a marketing exercise.