Comparing Medicare plans in Washington
Medicare Advantage—officially known as Medicare Part C—is a private-market alternative to the traditional federal Medicare program. If you are approaching age 65 or navigating your Medicare options in Washington state, understanding Medicare Advantage is arguably the most critical financial and healthcare decision you will make. It represents a fundamental fork in the road: you either stay in the federal government’s open-network system, or you transfer your care management to a private insurance company in exchange for bundled benefits, capped financial risks, and often, zero-dollar monthly premiums.
For the 2026 plan year, Washington features a robust and highly competitive Medicare Advantage market, with 124 individual plans available across the state. However, because health insurance is inherently local, the exact options available to a resident of Seattle will look vastly different from those available in Spokane or Yakima.
This comprehensive guide is designed to serve as the foundation of your Medicare education. We will break down the mechanics of how Medicare Advantage functions, the specific types of networks you will encounter in Washington, the hidden rules of managed care, how these plans interact with prescription drug coverage, and the exact steps you need to take to evaluate whether a Part C plan is the right choice for your healthcare needs.
To understand Medicare Advantage, you must first understand the system it replaces. When you age into the Medicare system, you are automatically enrolled in Original Medicare, which consists of Part A (inpatient hospital care) and Part B (outpatient medical care). Original Medicare is a fee-for-service model managed directly by the federal government. You can see any doctor in the country who accepts Medicare, and the government pays them directly.
However, Original Medicare has significant gaps. It covers only 80% of approved outpatient costs, leaving you entirely responsible for the remaining 20%—with no upper limit on what you might owe if you suffer a catastrophic health event. Furthermore, Original Medicare does not cover retail prescription drugs, routine dental care, vision exams, or hearing aids.
Medicare Advantage (Part C) was legislated into existence to provide an alternative structure. When you enroll in a Medicare Advantage plan, you do not lose your Medicare benefits; rather, you choose to receive those benefits through a private insurance company approved by the Centers for Medicare & Medicaid Services (CMS).
The financial mechanism powering Medicare Advantage is called capitation. When you join a plan, the federal government pays your chosen insurance carrier a fixed, monthly lump sum to manage your healthcare. In return, the private carrier takes on the financial risk of your medical needs.
This model explains why many Medicare Advantage plans in Washington feature $0 monthly premiums. The insurance company is already receiving a substantial monthly payment from the government on your behalf. By tightly managing a network of doctors and prioritizing preventive care, the insurance company aims to provide your care for less than that federal payment, using the savings to fund extra benefits and generate a profit.
It is vital to understand that even if your Medicare Advantage plan has a $0 premium, you are still legally required to pay your standard Medicare Part B premium to the federal government. You are not buying your way out of the Medicare system; you are simply outsourcing its administration.
For 2026, Washington residents can choose from a total of 124 Medicare Advantage plans statewide. The market is populated by a mix of massive national carriers and strong regional health systems. Major carriers operating in the state include Aetna Medicare, Devoted Health, HealthSpring, Humana, Kaiser Permanente, Providence Medicare Advantage Plans, Regence BlueCross BlueShield of Oregon, Regence BlueShield, SCAN Health Plan, UnitedHealthcare, and Wellcare.
Because Medicare Advantage is administered at the county level, carriers file specific plan variations based on local healthcare infrastructure. A carrier must prove to the federal government that it has contracted with enough local doctors and hospitals—a standard known as “network adequacy”—before it is legally permitted to sell a plan in a given county.
You will see plans branded with complex names indicating their structure and network type. For example, in the Washington market for 2026, UnitedHealthcare offers an extensive lineup of options under the AARP banner, including:
Each of these plan names carries crucial information about exactly how your care will be managed, which brings us to the most important structural element of any Part C plan: the network.
The single biggest difference between Original Medicare and Medicare Advantage is network restriction. Original Medicare has no networks. Medicare Advantage is entirely defined by them. Understanding the acronyms attached to these plans is essential for ensuring you have access to the doctors you trust.
HMOs are the most restrictive but often the most cost-effective Medicare Advantage plans. If you enroll in an HMO, you are required to select a Primary Care Physician (PCP) who acts as the “gatekeeper” to your healthcare.
PPOs offer a significantly higher degree of flexibility, making them incredibly popular among Washington residents who travel or who simply prefer more autonomy in their healthcare decisions.
The HMO-POS is a hybrid model that is highly prevalent in Washington’s 2026 market, as seen in plans like the AARP Medicare Advantage Essentials from UHC WA-8 (HMO-POS).
Special Needs Plans are a highly specialized subset of Medicare Advantage designed for individuals with specific vulnerabilities. By law, SNP membership is limited to three distinct groups:
By federal law, every Medicare Advantage plan must cover all of the medically necessary services that Original Medicare Part A and Part B cover. The private insurance company cannot decide that a standard, necessary surgery is suddenly uncovered just because you chose Part C. What changes is how the care is delivered and exactly what you pay for it.
Your Medicare Advantage plan completely absorbs your inpatient hospital care (Part A). This includes hospital stays, skilled nursing facility care, hospice care, and some home healthcare. It also absorbs your outpatient medical care (Part B), which encompasses doctor visits, preventive screenings, durable medical equipment, lab work, and outpatient surgeries.
One of the massive selling points of Medicare Advantage is the bundling of prescription drug coverage. The vast majority of Part C plans are designated as “MA-PD” plans, meaning Medicare Advantage - Prescription Drug.
If you choose Original Medicare, you must purchase a standalone Part D plan from a private insurer to avoid federal penalties and get your medications covered. If you enroll in an MA-PD plan, your health coverage and drug coverage are managed by the exact same company, housed on the same ID card.
The carriers determine which drugs they cover through a “formulary,” which is a tiered list of medications. Lower tiers contain generic drugs with very small copays (often $0 or $2), while higher tiers contain expensive, brand-name specialty drugs that require you to pay a percentage of the total cost (coinsurance).
To compete for your enrollment in Washington’s crowded market, carriers pour the savings generated from managed care into supplemental benefits that Original Medicare explicitly ignores. These are often the most visible and heavily advertised features of Medicare Advantage. Common extras include:
While these extra benefits are incredibly valuable, they should never be the primary reason you select a specific plan. A generous dental allowance will not help you if the plan’s network does not include the oncologist you urgently need to see.
Navigating the costs of Medicare Advantage requires understanding that you are trading the predictable but high premiums of Original Medicare + Medigap for a pay-as-you-go structure characterized by copays and a vital safety net called the MOOP.
Many Washington Medicare Advantage plans boast a $0 monthly premium. This is real; you do not pay the carrier a monthly fee for the health insurance itself. However, as noted, you must continue to pay your Part B premium (which is deducted directly from your Social Security check).
Some plans may also feature a deductible. This is the amount you must pay out of your own pocket before the plan begins to pay its share. In Medicare Advantage, you will often find plans with $0 medical deductibles, though they may retain a specific deductible exclusively for higher-tier prescription drugs.
When you actually use healthcare services, you share the cost with the insurance company.
| Coverage Feature | Original Medicare | Medicare Advantage (Typical) |
|---|---|---|
| Provider Network | None. Any doctor in the US who accepts Medicare. | Strict networks (HMO/PPO). Usually localized to your state/county. |
| Part B Premium | You pay the standard federal rate. | You pay the standard federal rate. |
| Plan Premium | $0 for Part A; standard rate for Part B. | Often $0, up to $100+ depending on the plan. |
| Prescription Drugs | Not covered. Must buy standalone Part D. | Usually bundled inside the plan (MA-PD). |
| Routine Dental/Vision | Not covered. | Often included with allowances/maximums. |
| Out-of-Pocket Maximum | None. Unlimited financial risk. | Required by law. Capped annual spending limit. |
The Maximum Out-of-Pocket limit is the most critical consumer protection built into the Medicare Advantage program. It is the absolute ceiling on what you will pay for covered in-network medical services in a calendar year.
If a plan has a MOOP of $4,500, you will continue paying your standard copays and coinsurance for hospital stays, scans, and specialist visits throughout the year. However, if you experience a severe medical event—such as a heart attack requiring extensive surgery and rehabilitation—your costs will accumulate. The moment your total out-of-pocket spending on medical services hits $4,500, the plan steps in and pays 100% of your covered medical bills for the remainder of the calendar year.
Important Note: Prescription drug costs (Part D) do not count toward your medical MOOP. They are tracked through a separate phase-based system governed by federal Medicare drug rules.
The trade-off for bundled benefits and low premiums is managed care. When you enroll in Medicare Advantage, you are agreeing to let an insurance company actively oversee the utilization of your healthcare. They do this through several administrative mechanisms that you must be prepared to navigate.
Prior authorization is a requirement that your doctor must contact your Medicare Advantage plan to get explicit approval before performing a non-emergency service, procedure, or prescribing a highly expensive medication.
The carrier employs medical directors who review the request to determine if the procedure is medically necessary according to their clinical guidelines. If they deem it unnecessary or prefer you try a less expensive treatment first, they can deny the authorization. If you proceed with the treatment without authorization, the plan will refuse to pay for it, leaving you entirely responsible for the bill. Prior authorizations are most commonly required for planned surgeries, advanced imaging (like MRI or PET scans), and specialized therapies.
Step therapy is a common cost-control protocol primarily applied to prescription drugs. If your doctor prescribes an expensive brand-name medication, the plan may require you to first “step” through a less expensive, generic alternative. Only if the cheaper alternative fails to treat your condition adequately will the plan authorize coverage for the original, more expensive drug.
Original Medicare is stable; practically every hospital accepts it, and very few doctors drop it. Medicare Advantage networks, however, are fluid contracts between the carrier and the providers. A hospital system or a large medical group in Washington can choose to terminate their contract with UnitedHealthcare or Kaiser Permanente in the middle of the year. If that happens, you must find a new doctor within the network, or you will be forced to pay out-of-network costs.
Enrolling in a Medicare Advantage plan is governed by strict federal windows. You cannot simply join or switch plans whenever you want. Missing your designated window means waiting for the next annual opportunity, potentially leaving you trapped in a plan that no longer suits your needs.
Before evaluating specific plans, ensure you meet the legal baseline to enroll in a Medicare Advantage plan in Washington.
Your first opportunity to join a Medicare Advantage plan happens when you first become eligible for Medicare. This is a 7-month window that begins three months before your 65th birthday month, includes your birthday month, and extends for three months after. If you enroll during this time, your coverage generally begins on the first day of your birthday month.
The Annual Enrollment Period runs from October 15 through December 7 every single year. This is the busiest season in the Medicare world. During this eight-week window, you have total freedom to change your coverage for the upcoming calendar year. You can:
Any changes you make during the AEP take effect on January 1st of the new year. Because carriers change their networks, drug formularies, and copays every year, you should use every AEP to review your current plan against the new options entering the Washington market.
If you are already enrolled in a Medicare Advantage plan on January 1st, you are granted a special “buyer’s remorse” window that runs from January 1 through March 31.
During the MA OEP, you are allowed a one-time opportunity to switch to a different Medicare Advantage plan, or drop your plan and return to Original Medicare (and pick up a standalone Part D drug plan). You cannot use this window to move from Original Medicare into a Part C plan; it is exclusively for people already in the Medicare Advantage system who realize their current plan is not working for them.
Life circumstances can trigger a Special Enrollment Period, allowing you to bypass the standard seasonal windows and change your plan immediately. The most common triggers for a two-month SEP in Washington include:
When you first enroll in Part B, you face the central Medicare decision: Part C (Advantage) or Medigap (Supplement). You cannot have both.
A Medigap policy is supplemental insurance that bolts onto Original Medicare to pay the 20% coinsurance that the federal government leaves behind. With a Medigap plan, you keep the universal Original Medicare network—any doctor, anywhere in the country—and you face virtually no copays, no network restrictions, and no prior authorizations.
However, Medigap requires a steep monthly premium. A 65-year-old in Washington might pay $150 to $200 every single month for a Medigap policy, on top of their Part B premium, and on top of the separate Part D drug plan they must purchase.
How to decide between the two:
With 124 options statewide, selecting a plan by looking at a list of premiums is a recipe for disaster. Evaluating Medicare Advantage requires a methodical, step-by-step approach.
Step 1: Audit Your Doctors The single fastest way to narrow down the Washington market is to list every primary care doctor, specialist, and hospital you currently use and refuse to give up. Check these specific names against the directories of carriers like Humana, Regence, and UnitedHealthcare. If your cardiologist is out-of-network for a specific HMO plan, eliminate that plan immediately.
Step 2: Cross-Reference Your Prescriptions Gather all your pill bottles. Look at the exact names and dosages. Every Medicare Advantage plan has a different formulary. A medication that is a Tier 2 ($10 copay) on an Aetna plan might be a Tier 3 ($47 copay) on a Kaiser plan, or completely excluded from a Wellcare plan. The cost of your ongoing medications will impact your wallet far more heavily than a slightly higher specialist copay.
Step 3: Evaluate the Maximum Out-of-Pocket (MOOP) Look past the $0 premium and look directly at the MOOP. Plan A might have a $3,900 MOOP, while Plan B has an $8,500 MOOP. Ask yourself: if I am diagnosed with cancer in February and need six months of chemotherapy and surgery, can I comfortably write checks totaling the MOOP? Choose a plan with a safety net that aligns with your true financial capacity.
Step 4: Assess the Network Type Decide if you are willing to manage referrals in an HMO to save money, or if you demand the flexibility of a PPO to self-direct your care. If you travel south for the winter (“snowbirds”), an HMO localized strictly to Washington state will leave you financially exposed for routine care while out of state; a PPO with a robust national network is mandatory in that scenario.
Step 5: Review the Extras Last Only after you have confirmed your doctors are in-network, your drugs are covered affordably, and the MOOP is acceptable should you compare the dental, vision, and gym benefits. Never let a $50-a-month grocery allowance distract you from a restrictive network that locks you out of your preferred local hospital.
Speak with a licensed professional to verify your doctors, compare specific drug formularies, and find the exact Medicare Advantage plan that fits your healthcare needs.
Get a Free ConsultationWe do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1–800–MEDICARE to get information on all of your options.