The short answer
COBRA continues the group health coverage you already have when a qualifying event ends it. You generally pay the whole premium — your old share plus the employer's — plus 2%, up to 102% of the cost to the plan. Job loss or reduced hours gives 18 months; several family events give 36. A disability extension can add up to 11 months.
COBRA applies to group health plans sponsored by employers with 20 or more employees.
You may be required to pay the entire premium, up to 102% of the cost to the plan.
Job loss or reduced hours generally gives 18 months of coverage.
Divorce, death of the employee, or a child losing dependent status generally give 36 months, and Medicare entitlement can also give up to 36 months.
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The whole article, with every detail and caution.
This page is for people facing the loss of job-based health coverage during cancer treatment, and for their families. It explains what COBRA is, what it costs, how long it lasts, and the deadlines that matter.
What COBRA is
COBRA is the rule that lets workers and their families keep the group health coverage they already had. It applies when something happens that would otherwise end that coverage. The Department of Labor describes it as applying to people who lose health benefits through certain events. These include voluntary or involuntary job loss, a reduction in hours worked, a transition between jobs, death, divorce, and other life events. It applies to group health plans sponsored by employers with 20 or more employees.
The key feature for anyone mid-treatment is continuity. It is the same plan, the same network, and the same formulary (list of covered drugs). Nothing about your care has to be renegotiated.
COBRA does not give you new insurance. It stops you losing the insurance you have.
The cost, and why it lands so hard
Under COBRA you generally pay the entire premium, plus 2%. The entire premium means the share you used to pay plus the share your employer was quietly covering. The Department of Labor puts the ceiling at 102% of the cost to the plan.
Most people have no idea what their employer was contributing until this moment. That is why the first invoice is a shock. It is not a penalty and it is not a mark-up on illness. It is the actual cost of the coverage, now visible.
During a disability extension, plans may charge up to 150% of the premium for the extended months, while 102% applies to other continuation.
How long it lasts
Cost is one half of the decision. The other half is time. The duration depends on which event triggered it:
- 18 months — job loss or reduced hours, for the employee, spouse, and dependents.
- 36 months — in these situations:
- When job loss or reduced hours comes within 18 months after the employee became entitled to Medicare: up to 36 months after the date of Medicare entitlement.
- For a former spouse and dependents, after divorce or legal separation.
- For surviving family members, after the employee's death.
- For a child who loses dependent status.
Two extensions exist. A disability extension can add up to 11 months, bringing the total to 29. A second qualifying event during the initial period can extend coverage to 36 months in total.
Line those numbers up against your treatment plan. If your oncologist expects treatment to run well past 18 months, that is worth knowing at the start, not at month 17.
The two deadlines that matter
At least 60 days to elect. Your election period starts when your coverage ends or when your COBRA election notice is provided or mailed to you, whichever is later.
At least 45 days to make the first payment. The plan cannot require a payment when you elect. It must give you at least 45 days after you elect to make the first one. If you miss that window, the plan can end your COBRA rights.
The Department of Labor guide does not explain how coverage dates work while you are deciding. Before you wait, ask the plan administrator in writing how claims in that period would be handled, so you are not left uninsured by accident.
Weighing it against the alternatives
The Department of Labor notes that being offered COBRA does not make you ineligible for Marketplace coverage or a tax credit, and that you can special enroll in a Marketplace plan within 60 days before or after losing job-based coverage. So the question is rarely "COBRA or nothing." It is usually a trade between cost and continuity.
Things worth checking before you decide:
- Would a different plan put your oncologist or your cancer center out of network?
- Are your current medicines on the other plan's covered drug list, and at what tier?
- Would you need new prior authorizations for treatment already approved?
- How much of your current plan's out-of-pocket maximum have you already spent this year?
That last one is easy to forget and can be decisive. Ask whether what you have already spent this year would count toward a new plan's out-of-pocket maximum.
Once you are on it
Keep paying on schedule. The plan must allow monthly payments if you ask, and must give at least a 30-day grace period for each payment. The plan can end your coverage if full payment is not received before the grace period ends.
Set a standing payment and keep proof. Put the end date of your COBRA period in your calendar the day you elect. Add a reminder a couple of months earlier, so the next decision does not arrive unannounced.

Common questions
Why is COBRA so much more expensive than what I paid before?
Because your employer was covering part of the premium. Under COBRA you generally pay your old share plus the employer's share, plus 2% — up to 102% of the cost to the plan.
How long do I have to decide?
You have at least 60 days to elect COBRA, starting from when your coverage ends or when your election notice is provided or mailed to you — whichever is later.
Is there a gap while I decide?
The Department of Labor guide says a plan cannot require a payment when you elect, and must give you at least 45 days after electing to make the first payment. It does not say how coverage dates work while you decide, so ask the plan administrator in writing how claims in that period would be handled before you wait.
Can it last longer than 18 months?
Yes in some cases. A disability extension can add up to 11 months, and a second qualifying event can extend coverage to a total of 36 months.
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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