Medicare Supplement Plan K is the quiet, budget-conscious cousin in the Medigap family. It does not show up wearing the fanciest suit like Plan G, and it does not promise to pay nearly every Medicare-approved leftover bill. Instead, Plan K says, “I’ll help with the major stuff, I’ll keep the premium lower, and I’ll give you an annual safety net.” For many people on Original Medicare, that simple trade-off is exactly the point.
If you are comparing Medicare Supplement insurance plans, also called Medigap plans, Plan K deserves a closer look. It can reduce certain out-of-pocket expenses from Medicare Part A and Part B, but it also requires you to share more costs than fuller plans. In plain English: you may pay less each month, but you should be prepared to pay more when you use care.
This guide breaks down Medicare Supplement Plan K coverage, 2026 costs, what it does not cover, how its out-of-pocket limit works, and who may benefit from choosing it.
What Is Medicare Supplement Plan K?
Medicare Supplement Plan K is one of the standardized Medigap plans sold by private insurance companies to people who have Original Medicare. Original Medicare includes Part A hospital insurance and Part B medical insurance. It pays a large portion of approved health care costs, but it does not pay everything. Deductibles, coinsurance, and copayments can still land in your mailbox like tiny paper gremlins.
That is where Medigap comes in. A Medigap policy helps pay some of the remaining costs after Original Medicare pays its share. Plan K is different from many other Medigap options because it covers only 50% of several major benefits instead of 100%. However, it also includes an annual out-of-pocket limit, which is unusual among Medigap plans.
For 2026, the Medicare Supplement Plan K out-of-pocket limit is $8,000. After you meet that limit and pay the annual Part B deductible, Plan K pays 100% of covered services for the rest of the calendar year. That makes Plan K a lower-premium, higher-cost-sharing plan with a built-in ceiling for certain covered expenses.
What Does Medicare Supplement Plan K Cover?
Plan K covers the same standardized benefits no matter which insurance company sells it. A Plan K policy from Company A must provide the same core medical benefits as a Plan K policy from Company B. The difference is usually the monthly premium, customer service, discounts, household pricing, and how rates may rise over time.
Plan K Coverage at a Glance
| Benefit | Plan K Coverage |
|---|---|
| Medicare Part A coinsurance and hospital costs up to 365 extra days after Medicare benefits are used | 100% |
| Medicare Part B coinsurance or copayment | 50% |
| First 3 pints of blood | 50% |
| Part A hospice care coinsurance or copayment | 50% |
| Skilled nursing facility care coinsurance | 50% |
| Medicare Part A deductible | 50% |
| Medicare Part B deductible | Not covered |
| Medicare Part B excess charges | Not covered |
| Foreign travel emergency care | Not covered |
How Plan K’s 50% Coverage Works
The most important thing to understand about Plan K is that “covered” does not always mean “paid in full.” For several benefits, Plan K pays half and you pay the other half. That is why Plan K usually has lower premiums than more comprehensive Medigap plans.
Here is a simple example. In 2026, the Medicare Part A hospital deductible is $1,736 per benefit period. Plan K covers 50% of that deductible. If you are admitted to the hospital and owe the full Part A deductible, Plan K would generally pay $868, and you would pay $868. That is still a meaningful reduction, but it is not the same as having a plan that pays the entire deductible.
For Part B services, Original Medicare usually pays 80% of the Medicare-approved amount after you meet the Part B deductible. You are typically responsible for the remaining 20%. Plan K covers 50% of that remaining coinsurance. So if your Part B coinsurance bill is $200, Plan K may pay $100, leaving you with $100.
That cost-sharing design is the Plan K personality in one sentence: helpful, but not heroic until you hit the annual limit.
The 2026 Plan K Out-of-Pocket Limit
One of the biggest advantages of Medicare Supplement Plan K is its out-of-pocket limit. In 2026, that limit is $8,000. Once you meet the Plan K out-of-pocket limit and pay the Medicare Part B deductible, Plan K pays 100% of covered services for the rest of the calendar year.
This limit is especially useful because Original Medicare does not have a built-in annual maximum out-of-pocket cap. Without supplemental coverage, a person with repeated hospitalizations, surgeries, specialist visits, or skilled nursing care could face ongoing cost-sharing. Plan K does not erase every possible bill, but it can create a ceiling for the expenses it covers.
There is one catch worth underlining in neon marker: the Plan K limit does not apply to everything. It does not include the Part B deductible. It does not protect you from Part B excess charges. It does not pay for foreign travel emergency care. It also does not cover prescription drugs, dental care, vision care, hearing aids, or long-term custodial care.
What Medicare Supplement Plan K Does Not Cover
Plan K can be a smart option, but it is not a magical Medicare umbrella. Before enrolling, make sure you understand the gaps.
Prescription Drugs
Medigap plans sold today do not include prescription drug coverage. If you want help paying for medications, you generally need a separate Medicare Part D prescription drug plan. Skipping Part D when you do not have other creditable drug coverage can also lead to a late-enrollment penalty later.
Dental, Vision, and Hearing
Plan K does not cover routine dental cleanings, dentures, eyeglasses, routine eye exams, or hearing aids. Some people buy separate dental, vision, or hearing coverage. Others pay cash and hope their teeth remain polite.
Long-Term Custodial Care
Medigap does not cover long-term custodial nursing home care, such as help with bathing, dressing, or eating when skilled medical care is not required. This is one of the most misunderstood Medicare topics. Medicare may cover limited skilled nursing facility care after a qualifying hospital stay, but it is not long-term care insurance.
Foreign Travel Emergency Care
Some Medigap plans cover foreign travel emergency care up to plan limits. Plan K does not. If you spend months abroad or dream of collecting passport stamps like trading cards, this matters.
Part B Excess Charges
Plan K does not cover Medicare Part B excess charges. These charges may happen when a provider does not accept Medicare assignment and is allowed to bill more than the Medicare-approved amount. Not every state allows excess charges, and not every provider bills them, but it is still a factor to check.
How Much Does Medicare Supplement Plan K Cost?
Medicare Supplement Plan K does not have one national price. Premiums vary by ZIP code, insurance company, age, tobacco use, household discounts, gender in some states, and pricing method. Two neighbors can pay different premiums for the same lettered plan, which is both legal and mildly annoying.
Because Plan K covers less upfront than plans like G or N, it often has a lower monthly premium. That is the appeal. Instead of paying a higher premium every month for richer coverage, you accept more cost-sharing when you actually use care.
For example, insurer-published and Medicare comparison examples often show Plan K premiums starting in the lower monthly range compared with fuller Medigap plans, although exact prices vary sharply by location. In one 2026 example for a 65-year-old nonsmoker in Greenwood, South Carolina, Plan K premiums were listed from $66 to $165 per month. Other cities and insurers may show very different numbers.
Costs to Budget Beyond the Plan K Premium
When comparing Medicare Supplement Plan K costs, do not look only at the monthly premium. Your real annual cost may include several pieces:
- Your monthly Medicare Part B premium
- Your monthly Plan K premium
- The Medicare Part B deductible, which is $283 in 2026
- Your share of Part A and Part B cost-sharing before reaching the Plan K limit
- Prescription drug plan premiums and medication costs
- Dental, vision, hearing, and long-term care expenses if needed
A lower premium can be wonderful if you rarely use medical care. But if you have frequent doctor visits, outpatient procedures, therapy, hospital stays, or skilled nursing needs, the shared costs can add up. Plan K is not “cheap” in every scenario. It is “premium-light, cost-sharing-heavier.” Big difference.
Plan K vs. Plan G and Plan N
Most people comparing Medigap options hear a lot about Plan G and Plan N. Plan G is popular because it covers most major Original Medicare cost-sharing except the Part B deductible. Plan N usually has lower premiums than Plan G but includes certain copays and does not cover Part B excess charges.
Plan K sits in a different lane. It is for people who want a lower monthly premium and are comfortable paying a larger share of Medicare-approved costs until they reach the annual limit. It may appeal to people who are generally healthy, have emergency savings, and want some protection from very large covered expenses without paying for the richest Medigap option.
However, someone who wants highly predictable medical bills may prefer Plan G or Plan N. Paying more each month can feel painful, but surprise medical bills can feel like stepping barefoot on a LEGO in the dark. Predictability has value.
Who Might Like Medicare Supplement Plan K?
Plan K may be a good fit for someone who wants a lower monthly premium and can handle moderate out-of-pocket costs. It may also make sense for a beneficiary who likes the idea of having an annual limit for covered services but does not want to pay for a more comprehensive plan.
Plan K may be worth considering if you:
- Have Original Medicare and want supplemental help with cost-sharing
- Prefer a lower monthly premium
- Can afford out-of-pocket costs when care is needed
- Do not travel internationally often
- Use doctors who accept Medicare assignment
- Want a Medigap plan with an annual out-of-pocket limit
Plan K may not be ideal if you expect frequent medical care, want the most predictable bills possible, travel outside the United States often, or dislike the idea of paying 50% of several cost-sharing categories.
When Can You Enroll in Medicare Supplement Plan K?
The best time to buy any Medigap plan is usually during your six-month Medigap Open Enrollment Period. This period starts the first month you are both 65 or older and enrolled in Medicare Part B. During this window, insurance companies generally cannot deny you a Medigap policy or charge you more because of your health history.
After that period, your options may be limited. In many states, insurers can use medical underwriting, charge more, or deny your application unless you have a guaranteed issue right. Some states offer extra protections, such as birthday rules or broader enrollment rights, so it is wise to check with your State Health Insurance Assistance Program or state insurance department.
One common mistake is assuming that the annual Medicare Open Enrollment Period from October 15 to December 7 gives everyone a fresh chance to buy Medigap without underwriting. It usually does not. That annual window is mainly for Medicare Advantage and Part D changes, not a yearly Medigap do-over.
How to Compare Plan K Policies
Because Plan K benefits are standardized, comparing policies is mostly about price, company stability, rate history, discounts, and service. The core medical benefits should be the same for the same lettered plan.
Ask These Questions Before Buying
- What is the monthly premium today?
- Is the policy community-rated, issue-age-rated, or attained-age-rated?
- How often has the company raised rates in recent years?
- Are household, autopay, annual payment, or nonsmoker discounts available?
- Does the company offer Medicare SELECT, which may require a provider network?
- Are my preferred doctors and hospitals Medicare-participating providers?
- How much could I afford in a bad medical year before hitting the Plan K limit?
Also compare Plan K with Plan L. Plan L has a lower out-of-pocket limit than Plan K and pays 75% of several benefits instead of 50%, but it usually costs more per month. If Plan K feels too lean and Plan G feels too rich, Plan L may be the “middle child” worth inviting to the spreadsheet party.
Real-Life Cost Example
Imagine Linda, age 66, has Original Medicare and buys Plan K because she likes the lower premium. She sees her primary doctor twice, a specialist three times, and has outpatient imaging during the year. After Medicare pays its approved share, Linda owes Part B coinsurance. Plan K pays 50% of that coinsurance, and Linda pays the other 50%.
Now imagine Linda has a hospital stay. Medicare Part A applies a deductible. Plan K pays half of that deductible, and Linda pays the rest. If Linda’s covered out-of-pocket costs keep growing and she reaches the Plan K annual limit after meeting the Part B deductible, Plan K pays 100% of covered services for the rest of the year.
This is why Plan K can be attractive but requires honest budgeting. It protects against some large covered expenses, but it does not make every bill disappear. Plan K is more like a sturdy rain jacket than a full-body waterproof bubble.
Experiences and Practical Lessons About Medicare Supplement Plan K
People who consider Medicare Supplement Plan K often describe the decision as a balancing act between monthly comfort and future uncertainty. The monthly premium can look friendly, especially when compared with more comprehensive Medigap plans. For someone living on Social Security, pension income, retirement savings, or a carefully planned budget, saving money every month is not a small detail. It can be the difference between feeling financially squeezed and feeling like there is breathing room.
One common experience is that Plan K appeals most to people who do not visit doctors frequently. A healthy new Medicare beneficiary may look at Plan G premiums and think, “Why should I pay more every month for benefits I might not use?” That is a fair question. If the person has savings and understands the cost-sharing, Plan K may feel like a reasonable compromise. The plan provides partial help with major Medicare cost-sharing and includes an annual limit for covered services.
Another experience is more cautionary. Some people focus heavily on the lower premium and do not fully understand the 50% cost-sharing. Then a hospital visit, outpatient procedure, or skilled nursing facility stay makes the plan feel less cheap than expected. This does not mean Plan K is bad. It means Plan K needs to be chosen with both eyes open, preferably with a calculator nearby and coffee strong enough to survive Medicare paperwork.
A practical lesson is to compare total annual risk, not just monthly premium. Suppose one plan costs more each month but greatly reduces unexpected bills. Another plan costs less each month but asks you to pay more when care is used. Neither is automatically better. The right choice depends on cash flow, health status, risk tolerance, local premiums, provider habits, and how much money you can access quickly if medical costs appear.
People who are comfortable with Plan K often have a few things in common. They understand that the out-of-pocket limit is not the same as “everything is covered.” They know they still need Part D for prescriptions. They check whether their doctors accept Medicare assignment. They keep emergency savings. They also review premiums from multiple insurers because the same standardized Plan K benefits can be priced very differently.
For caregivers helping a parent choose coverage, Plan K can spark important family conversations. Is the parent comfortable receiving and paying medical bills? Would a higher premium but simpler billing reduce stress? Does the parent travel abroad? Are there chronic conditions that could increase outpatient costs? Sometimes the “best” plan is not the one with the lowest mathematical cost. It is the one the beneficiary can understand, afford, and live with peacefully.
The biggest takeaway from real-world Plan K decisions is simple: Plan K rewards informed shoppers. It can be a smart, budget-friendly Medigap choice for people who want lower premiums and can handle shared costs. But it is not ideal for everyone. Before enrolling, compare Plan K against Plan L, Plan N, and Plan G in your ZIP code. Look at premiums, likely medical usage, and worst-case exposure. Medicare decisions are not exactly beach reading, but making the right choice can protect both your wallet and your sanity.
Conclusion
Medicare Supplement Plan K is a lower-premium Medigap option with meaningful cost-sharing and a valuable annual out-of-pocket limit. It covers 100% of Medicare Part A coinsurance and hospital costs for up to 365 extra days after Medicare benefits are used, and it covers 50% of several other major Medicare cost-sharing categories, including the Part A deductible, Part B coinsurance, skilled nursing facility coinsurance, hospice coinsurance, and the first 3 pints of blood.
In 2026, Plan K’s out-of-pocket limit is $8,000, and the Medicare Part B deductible is $283. After both requirements are met, Plan K pays 100% of covered services for the rest of the year. That safety net can be helpful, but Plan K still does not cover prescription drugs, dental care, vision care, long-term custodial care, foreign travel emergency care, the Part B deductible, or Part B excess charges.
The best candidate for Plan K is someone who wants lower monthly premiums, understands the trade-offs, and can afford shared medical costs if care is needed. The smartest move is to compare plans by ZIP code, ask how premiums are rated, check discounts, and think beyond the monthly price. In Medicare, the cheapest plan on paper is not always the cheapest plan in real life.
