Supplemental insurance options — what's out there beyond Medigap
Reviewed by the How To Help Your Elders Team | Updated March 2026
Medicare does not cover everything, which is why supplemental insurance exists. Medigap is the most well-known option, but it is not the only one. Hospital indemnity insurance, critical illness coverage, accident insurance, and Medicare Advantage plans each fill different gaps in different ways at different price points. Understanding what each product actually does, and what it does not, lets you make decisions based on your parent's real situation instead of reacting to sales pitches.
Medigap: the standard supplement to Original Medicare
Medigap, formally called Medicare Supplement Insurance, is the most established form of supplemental coverage. Your parent has Original Medicare, and Medigap fills the gaps between what Medicare pays and what the provider charges: copays, deductibles, coinsurance, and some services Medicare does not cover.
Medigap comes in standardized plans labeled A through N. Each plan offers a defined set of benefits, and those benefits are the same regardless of which insurance company sells the plan. Plan G from company X covers the same things as Plan G from company Y. The difference between companies is the premium. According to KFF, Medigap premiums vary by as much as 50-100% between insurers for identical plan letters in the same geographic area, which makes comparison shopping worth the effort.
The most comprehensive plans (like Plan G, the most popular since Plan F closed to new enrollees in 2020) cover Medicare Part A hospital deductibles, Part B copays and coinsurance, skilled nursing facility coinsurance, and foreign travel emergency care. CMS data shows that Plan G and Plan N together account for the majority of new Medigap enrollments. The least comprehensive plans cover basic cost-sharing but leave more out-of-pocket exposure.
One important rule: Medigap is only available to people on Original Medicare. If your parent chooses Medicare Advantage, they cannot also have Medigap. These are mutually exclusive paths.
The right time to buy Medigap is during the six-month open enrollment period that begins when your parent turns 65 and enrolls in Medicare Part B. During this window, insurance companies must sell your parent any Medigap plan they offer at the standard rate, regardless of health conditions. According to CMS, once this window closes, insurers in most states can use medical underwriting to charge higher premiums or deny coverage entirely based on pre-existing conditions. If your parent is already past this window, they can still apply, but they may face higher costs or limited plan options depending on their state's rules.
Medicare Advantage: the all-in-one alternative
Medicare Advantage (Part C) is not supplemental insurance. It is a complete replacement for Original Medicare. Your parent gets all their Medicare benefits through a private insurance company instead of through the traditional system. Most Medicare Advantage plans include drug coverage (Part D) built in, which means your parent does not need a separate drug plan.
According to KFF, more than half of all Medicare beneficiaries (approximately 33 million people as of 2025) are now enrolled in Medicare Advantage plans. The appeal is clear: premiums are often lower than Original Medicare plus Medigap plus a standalone Part D plan, and many plans include extra benefits like dental, vision, hearing, and fitness programs.
The trade-off is networks. Medicare Advantage plans typically require your parent to use doctors and hospitals within the plan's network, or pay significantly more for out-of-network care. If your parent has specific doctors they have seen for years, those doctors may not be in the network. If your parent lives part of the year in a different state, they may face coverage limitations outside the service area. CMS requires all Medicare Advantage plans to cap annual out-of-pocket costs (the 2025 in-network cap is $8,850), which Original Medicare does not do. That cap provides financial predictability, but it also means costs can accumulate to that ceiling in a bad health year.
If your parent chooses Medicare Advantage, they do not buy Medigap. The two approaches are incompatible. This is the most consequential insurance decision your parent will make after turning 65.
Hospital indemnity insurance: a fixed daily payment
Hospital indemnity insurance works differently from Medigap. It does not coordinate with Medicare or fill specific coverage gaps. Instead, it pays a fixed dollar amount for each day your parent spends in the hospital, regardless of what the actual medical bills are. A policy might pay $200 or $400 per day of hospitalization. That money goes to your parent, and they can use it however they need.
This is a narrow product. It covers hospital stays only, not outpatient care or doctor visits. Premiums are typically $30 to $60 per month for someone in their 60s or 70s. The bet is that if your parent ends up hospitalized, the daily payment helps cover copays, deductibles, or other expenses that arise during a hospital stay.
Some people pair hospital indemnity with a basic Medigap plan for additional backup. Others use it as a standalone product if they are concerned about hospital costs but feel otherwise well covered. The math depends on how likely your parent is to be hospitalized. According to CMS data, approximately 15-20% of Medicare beneficiaries have at least one hospital admission per year, and the rate rises with age and chronic conditions.
Critical illness insurance: a lump sum for major diagnoses
Critical illness insurance pays a one-time lump sum if your parent is diagnosed with a qualifying serious illness: cancer, heart attack, stroke, or other conditions specified in the policy. The payout might be $5,000, $10,000, or $25,000. Your parent can use the money however they choose, whether for medical costs, home care, travel to a specialist, or anything else.
Premiums are usually $30 to $80 per month for older adults. The insurance company bets that most policyholders will not have a qualifying diagnosis during the policy term. For your parent, the value depends entirely on whether they experience a covered event and whether having cash available at that moment would meaningfully help.
This is a speculative product. Some people value the safety net. Some would rather save the monthly premium. There is no wrong answer, and the amount at stake (a few hundred dollars per year in premiums versus a potential lump-sum payout) is small enough that the decision comes down to personal comfort with risk.
Accident insurance: coverage for falls, injuries, and emergencies
Accident insurance covers costs related to accidents: falls, car injuries, fractures, and other unplanned events. It may pay for emergency room visits, accident-related hospitalization, physical therapy, and sometimes home modifications needed after an injury (like grab bars or a shower chair).
Premiums run $10 to $40 per month. The coverage is narrow: it only applies to accidents, not to illness or chronic conditions. For a parent who is active, lives alone, or has fall risk factors, the probability of an accident is higher and the coverage is more relevant. According to the CDC, falls are the leading cause of injury-related death among adults 65 and older, and one in four older adults falls each year. For a parent with lower risk, the coverage may not be worth the premium.
Choosing between Medigap and Medicare Advantage
This is the biggest supplemental coverage decision your parent will make, and there is no universal right answer. The best choice depends on your parent's specific circumstances.
If your parent has doctors they are committed to seeing, check whether those doctors are in the Medicare Advantage network being considered. If they are not, Medicare Advantage could force a provider switch. Original Medicare plus Medigap works with any provider who accepts Medicare, nationwide, without network restrictions.
If your parent travels or spends time in multiple states, Medicare Advantage networks can be restrictive outside the service area. Original Medicare plus Medigap provides coverage anywhere in the country.
If your parent has multiple chronic conditions and sees specialists regularly, Original Medicare plus Medigap may offer more flexibility since there are no referral requirements and no network limitations on specialists. If your parent is generally healthy, wants low monthly premiums, and values the convenience of an all-in-one plan, Medicare Advantage may be a better fit.
Compare costs concretely. Add up the Medicare Advantage plan premium (which may be $0), estimate likely copays and the out-of-pocket maximum. Compare that to the combined cost of Original Medicare Part B premium, a Medigap plan, and a standalone Part D drug plan. KFF's Medicare plan comparison tools and Medicare.gov's plan finder both allow side-by-side comparison for your parent's specific location and needs.
The choice is partially reversible through annual enrollment periods, but switching from Medicare Advantage back to Original Medicare plus Medigap can be complicated. In most states, your parent would face medical underwriting for Medigap if they are past the initial open enrollment window. This means switching to Medicare Advantage first and then trying to come back is riskier than staying with Original Medicare from the start.
When narrow supplemental products make sense alongside Medigap
If your parent has Original Medicare plus Medigap, the main coverage gaps are already addressed. Products like hospital indemnity, critical illness, and accident insurance become optional add-ons, not necessities. Whether they are worth it depends on personal risk tolerance and financial situation.
The premiums for these narrow products are small enough that they rarely break the budget. The real question is psychological: does having the coverage reduce your parent's anxiety about unexpected health costs? If yes, the peace of mind may be worth the $30 to $80 per month. If your parent does not think about these scenarios, the coverage is money spent on something that will probably never be used.
Evaluating any supplemental product
Whenever your parent is considering supplemental insurance, ask what gap it actually fills in their current coverage. Ask whether there is a waiting period before coverage begins. Ask about conditions that might cause a claim to be denied. Ask about annual and lifetime limits. Ask whether premiums are guaranteed to stay the same or can increase.
Get answers in writing. Do not rely solely on what a sales agent says during a pitch. Read the actual policy summary. If anything is confusing, ask again. There is no such thing as a question that is not worth asking when your parent is about to commit to years of premium payments.
Consider consulting an insurance broker who represents multiple companies rather than a single-company agent. A broker can compare products across the market and recommend what actually fits your parent's situation rather than what earns the highest commission.
The underlying truth is simple: Medicare alone leaves gaps. Your parent will face out-of-pocket costs without supplemental coverage. The question is which gaps matter most and how much your parent is comfortable paying. Having that conversation now, before a health crisis forces quick decisions, means your parent is covered appropriately and is not stressed about costs when they should be focused on getting better.
Frequently Asked Questions
What is the difference between Medigap and Medicare Advantage?
Medigap supplements Original Medicare by covering copays, deductibles, and coinsurance that Medicare does not pay. Your parent stays on Original Medicare and can see any provider who accepts it. Medicare Advantage replaces Original Medicare entirely, delivering all benefits through a private insurer, usually with a network of providers. The two approaches cannot be combined. Your parent chooses one or the other.
When is the best time to buy Medigap?
During the six-month open enrollment period that starts when your parent turns 65 and enrolls in Medicare Part B. During this window, insurers must sell any plan at the standard rate regardless of health conditions. After this window closes, insurers in most states can charge more or deny coverage based on pre-existing conditions.
Can my parent switch from Medicare Advantage back to Original Medicare and Medigap?
Your parent can switch back to Original Medicare during the annual enrollment period, but getting Medigap afterward can be difficult. In most states, once the initial open enrollment window has passed, insurers can use medical underwriting to set premiums or deny coverage. A few states offer guaranteed-issue rights in specific circumstances, but this varies.
Is hospital indemnity insurance worth it if my parent already has Medigap?
For most people with comprehensive Medigap coverage, hospital indemnity is optional. Medigap already covers most hospital-related cost-sharing. Hospital indemnity adds a fixed daily cash payment during hospitalization, which some people value as a financial cushion for non-medical expenses (meals for visiting family, transportation, lost income for a caregiver). At $30 to $60 per month, it is a relatively low-cost addition if the peace of mind is valued.
How do I compare Medicare Advantage plans in my parent's area?
Medicare.gov's Plan Finder tool allows you to search plans by zip code, compare premiums, copays, drug coverage, and provider networks side by side. KFF also publishes annual analyses of Medicare Advantage plan availability and costs by region. Enter your parent's specific medications and preferred doctors to see how each plan handles them.
What supplemental insurance does my parent need if they choose Medicare Advantage?
Medicare Advantage plans typically include more comprehensive coverage than Original Medicare alone, so the need for additional supplements is reduced. Some people add hospital indemnity or critical illness insurance for extra protection against high out-of-pocket costs, but these are optional. The most important thing is understanding the Medicare Advantage plan's out-of-pocket maximum, network restrictions, and any coverage gaps specific to that plan.