What Is a Grandfathered Health Plan?

Exempt from certain rules of the Affordable Care Act

A grandfathered health plan is one that was already in effect as of March 23, 2010, when the Affordable Care Act (ACA) was signed into law. Grandfathered plans exist in the individual/family insurance market, which are insurance plans that people buy themselves, as well as the employer-sponsored market, which are plans that employers offer to their employees.

This article will explain how grandfathered plans are regulated, how they differ from grandmothered plans, and what you should consider before renewing your grandfathered plan if you buy your own health coverage.

People with grandfathered coverage can add dependents to their plan, and employers with grandfathered health plans can add new employees to the plan. The plans themselves, however, have not been available for purchase since 2010, unless an employer with a grandfathered plan obtains a similar (or better) plan issued by a different insurer.

Grandfathered health plans: What are they and what regulations apply to them?

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Although grandfathered plans do not have to comply with many of the ACA's regulations, they are still considered minimum essential coverage. In most states, there is no longer a penalty for not having minimum essential coverage, but there are numerous qualifying events that will allow a person to enroll in an ACA-compliant plan in the individual market—as long as they had minimum essential coverage prior to the qualifying event. Grandfathered plans fit that requirement.

And a large employer offering a grandfathered plan is in compliance with the employer mandate as long as the coverage is affordable for employees and provides minimum value.

How a Plan Retains Grandfathered Status

In order to retain grandfathered status, a health plan can't make changes that result in a significant reduction in benefits or increase in cost-sharing for enrollees. But for employer-sponsored grandfathered plans, there has been some flexibility on this since mid-2021, under a new rule that was finalized in late 2020.

When considering enrollee costs, premium increases aren't taken into consideration. But employers cannot decrease the percentage of the premiums that they pay on behalf of their workers by more than 5 percentage points. So for example, if an employer offers a grandfathered plan and pays 75% of the premium—with employees paying the other 25%—the employer can drop their own share of the premiums down as far as 70%, but not below that. If the employer starts to pay only 50% of the premiums, the plan would lose its grandfathered status.

In order to retain a grandfathered plan status, an employer cannot significantly decrease the percentage of total premiums that the employer pays towards employees' plans.

Federal regulations were updated in 2010 to clarify what would and would not cause a health plan to lose its grandfathered status. Plans can add benefits, increase premiums, impose modest increases for cost-sharing, and employers can even purchase coverage from a different insurance company (self-insured plans can also switch their third-party administrators) while retaining their grandfathered plan status.

However, this applies only as long as the new plan doesn't result in a decrease in benefits or a significant increase in cost-sharing for enrollees.

If a health plan cuts benefits, increases the coinsurance percentage, increases copays and/or deductibles beyond an allowable amount, or adds a limit (or imposes a lower limit) to the total amount the health plan will pay, the plan will lose its grandfathered status.

The new rules that took effect in 2021 give employer-sponsored grandfathered plans a little more leeway in terms of how much they can increase cost-sharing without losing grandfathered status.

In a nutshell, employers are allowed to use an alternative calculation for determining the allowable inflation adjustment for cost-sharing. And the way the alternative option was calculated was changed in 2020 to allow it to be larger. But that rule change was reversed in 2021, under the Biden administration. So employer-sponsored grandfathered plans can still use an alternative approach to calculating allowable cost-sharing increases, but the alternative no longer allows as much leeway as it would have under the rules that were temporarily in place from 2020 to 2021.

And the new rules for grandfathered employer-sponsored plans also ensure that grandfathered HDHPs can increase cost-sharing as necessary in order to remain in compliance with IRS rules for HDHPs.

That had not yet become an issue, as the IRS rules for HDHPs had not required grandfathered plans to increase cost-sharing by more than the already-allowed limits. But just in case, the new rules make it clear that this will not become an issue in the future. This ensures that grandfathered group HDHPs will be able to retain both their grandfathered and HDHP status.

Grandmothered Plans: Not the Same as Grandfathered Plans

Grandmothered plans, also known as transitional plans, are different from grandfathered plans. Grandmothered plans are those that took effect after March 23, 2010, but before the end of 2013. In some states, they had to take effect before the end of September 2013 (since open enrollment for ACA-compliant plans first began on October 1, 2013).

Like grandfathered plans, grandmothered plans are exempt from many of the ACA's regulations, although they must comply with more regulations than grandfathered plans.

The statute of the ACA allows grandfathered plans may remain in effect indefinitely as long as they comply with the requirements for keeping grandfathered status. Neither the state nor the federal government can require them to terminate.

Grandmothered plans, however, can only remain in effect as long as the federal and state governments allow it. Several states never allowed grandmothered plans to exist, and some required them to terminate after just a year or so. In the rest of the states, federal regulations were released each year that granted another one-year extension for grandmothered plans. In early 2022, however, the federal government issued guidance that allows grandmothered plans to remain in effect until further notice, unless a state requires them to terminate.

However, there is nothing in the law that allows for grandmothered plans to continue to exist indefinitely the way grandfathered plans can.

Both grandmothered and grandfathered plans can be terminated by an insurance company and replaced with ACA-compliant coverage. This becomes more likely over time, as the number of people enrolled in the pre-ACA coverage dwindles and it becomes less administratively efficient to manage the plan.

ACA Regulations

There are ACA regulations that do not apply to grandfathered plans. But there are others that they must follow.

Grandfathered plans are not required to:

Though grandfathered plans aren't required to cover essential health benefits, they cannot impose lifetime benefit caps on any essential health benefits that they do cover. Employer-sponsored grandfathered plans had to phase out annual benefit caps by 2014.

On the other hand, grandfathered plans are required to:

  • allow dependents to remain on the plan until age 26 (assuming dependents are offered coverage)
  • not arbitrarily cancel coverage
  • comply with the ACA's medical loss ratio by spending the majority of premiums on medical costs
  • not impose lifetime benefit caps on any essential health benefits that they offer (keeping in mind that grandfathered plans are not required to offer essential health benefits)
  • provide enrollees with a summary of benefits and coverage

Note that the medical loss ratio rules do not apply to self-insured plans. And very large group plans tend to be self-insured.

Do Grandfathered Plans Need to Remain in Effect?

Although grandfathered plans are allowed to remain in effect indefinitely, there is nothing that says they are required to do so. Individuals and employers can choose to switch to ACA-compliant coverage instead, and insurers can choose to terminate grandfathered plans.

Particularly in the individual market, where new enrollees (except new dependents) have been unable to join grandfathered plans since 2010, grandfathered plans become less attractive to insurers over time. The risk pool shrinks since people switch to other plans, but no new enrollees can join the grandfathered plan.

The existing risk pool experiences a slowly deteriorating health status as enrollees get older and develop health conditions. Over time, this makes it more likely that an insurer may opt to terminate its grandfathered plans and switch the enrollees to ACA-compliant plans instead (enrollees in this situation also have the option to select their own new plan, either from their existing insurer or from another insurer).

As of 2020, less than 7% of grandfathered plan enrollees had individual market coverage. The vast majority of grandfathered plan enrollees are covered under employer-sponsored plans. These plans can continue to add new enrollees, as new employees become eligible for coverage. So there isn't as much stagnation in the risk pool for an employer-sponsored grandfathered plan.

Eventually, maintaining grandfathered individual market plans becomes inefficient for insurers.

When Your Grandfathered Plan Is Terminated

If your grandfathered plan is terminated by your employer or your health insurer, rest assured that you'll have an option to enroll in a new plan.

If your employer terminates a grandfathered plan, chances are they'll replace it with a new plan (which must fully comply with the applicable ACA rules for either large or small employer-sponsored plans, depending on the size of the business; most large group plans are self-insured, with different rules that apply).

Qualifying Event: Renewal or Termination of a Pre-ACA plan Triggers a Special Enrollment Period

If not, the loss of employer-sponsored coverage is a qualifying event that allows you a special enrollment period during which you can purchase your own plan in the individual market, either through the exchange or directly through an insurer (note that premium subsidies and cost-sharing reductions are only available in the exchange).

If your grandfathered individual market plan is terminated, it triggers the same special enrollment period. Insurers that are terminating a whole block of business generally schedule the termination for the end of the year.

That means that enrollees can simply select a new plan during open enrollment, which occurs each fall starting November 1. In most states, it continues through January 15, although there are some states with different enrollment deadlines.

During general open enrollment, people in most states must select a plan by December 15 in order to have coverage effective January 1. However, people whose existing coverage is terminating at the end of the year have the option to select a new plan right up until the 31st of December, and their new plan will still be effective on January 1 (the effective date rules are different when a person is enrolling due to loss of coverage, as opposed to using the general enrollment period)

The special enrollment period triggered by the loss of other coverage continues for another 60 days into the new year (or after the date of the loss of coverage if it occurs during another time of the year).

If you do enroll before the old plan ends, you'll have seamless coverage, as long as the last day of coverage under the old plan is the final day of a month.

If you use the special enrollment period after the grandfathered plan ends, you'll find yourself without health insurance for at least a month before your new plan takes effect.

Special Enrollment in Individual Market if Your Pre-ACA Plan Is Renewing

It's also worth noting that there's a special enrollment period in the individual market (on or off-exchange) if you have a non-calendar-year health plan that is renewing at a time other than January 1 and you would rather switch to a new plan (if the plan renews on January 1, enrollees can just use the regular open enrollment period for ACA-compliant plans, with coverage effective January 1).

Grandfathered plans often have non-calendar-year renewal dates. This puts people at a disadvantage if they have one of these plans and get a renewal rate increase mid-year, when it's not open enrollment in the ACA-compliant individual market.

The U.S. Department of Health and Human Services (HHS) created a special enrollment period that applies in this case. If your grandfathered plan is renewing mid-year, you can opt to let it renew, or you can opt to switch to a new plan in the ACA-compliant market.

Before opting to simply renew your grandfathered plan, it's wise to check to see if there are better options in the ACA-compliant market. If you have a grandfathered plan via your employer, you can still opt to shop around, but you won't be eligible for any premium subsidies to offset the cost of a plan you buy on your own—this is as long as the employer-sponsored plan is affordable and provides minimum value.


Grandfathered health plans are those that were already in effect when the ACA was signed into law in March 2010. These plans can remain in effect indefinitely, but they have not been available for purchase since the ACA was enacted. Most grandfathered plans exist in the employer-sponsored market, and these plans are allowed to add new employees as they become eligible for the coverage. But grandfathered plan enrollment in the individual market has dwindled considerably, as no new enrollees have joined those plans since 2010, other than newly-added dependents.

Grandfathered plans have to follow some ACA rules, but are exempt from most of them. However, grandfathered plans must follow certain guidelines in order to retain their grandfathered status.

A Word From Verywell

Be sure to check if you are eligible for premium subsidies if you buy your own new plan in the health insurance exchange in your state. Subsidy eligibility extends well into the middle class, and this is especially true through 2025, due to the American Rescue Plan's subsidy enhancements (which were extended by the Inflation Reduction Act). For the time being, there's no income cap for subsidy eligibility as long as you buy a plan in the exchange. Subsidies aren't available for grandfathered plans, so switching to a new plan might result in more robust coverage with a lower net premium.

9 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
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  2. Centers for Medicare and Medicaid Services. The Center for Consumer Information & Insurance Oversight. Keeping the Health Plan You Have: The Affordable Care Act and “Grandfathered” Health Plans. June 14, 2010 cms.gov

  3. Miller S. Amendment Lets Employers Switch Carriers, Stay 'Grandfathered'. Society for Human Resource Management. November 16, 2010 shrm.org

  4. Mercer. Law and Policy Group. 2022 ACA Cost-Sharing Caps and Other Changes Set; ESR Penalties Projected. May 18, 2021.

  5. Montz, Dr. Ellen. Director, Center for Consumer Information and Insurance Oversight (U.S. Department of Health and Human Services). Insurance Standards Bulletin Series. Extension of Limited Non-Enforcement Policy through 2023 and Later Benefit Years. March 23, 2022.

  6. U.S. Centers for Medicare & Medicaid Services. Grandfathered health insurance plans. Health insurance rights & protections. HealthCare.gov

  7. Keith, Katie. Health Affairs. Final Rule on Grandfathered Health Plans Will Allow Higher Consumer Costs. December 14, 2020.

  8. Norris, Louise. healthinsurance.org. What are the deadlines for the ACA's open enrollment period?

  9. Norris, Louise. healthinsurance.org. Non-Calendar-Year Renewal as a Qualifying Event. December 16, 2020.

Additional Reading

By Louise Norris
 Louise Norris has been a licensed health insurance agent since 2003 after graduating magna cum laude from Colorado State with a BS in psychology.