Turning 65 while you are still working creates an important Medicare decision: Do you enroll in Medicare Part B now, or can you delay it while keeping your employer health coverage?
The answer depends on more than your birthday. Employer size, whether your coverage is based on active employment, how your plan coordinates with Medicare, and the type of prescription drug coverage you have can all affect your next step.
There is no one-size-fits-all answer. Before you decline or delay Part B, confirm the rules that apply to your specific employment and health plan situation.
What Medicare Part B Covers
Medicare Part B generally covers medically necessary outpatient services, including physician visits, outpatient hospital care, preventive services, durable medical equipment, and certain other medical services.
Part A generally addresses inpatient hospital coverage, while Part B addresses many services received outside a hospital. Together, they form Original Medicare (although some people choose a Medicare Advantage plan instead of receiving benefits directly through Original Medicare).
You can learn more through our Medicare Part B resource.
Part B normally carries a monthly premium. The amount can change and may be higher for some individuals based on income. Because of that cost, many people working past age 65 want to know whether delaying Part B is reasonable.
The key question is not simply, “Do you have health insurance?” The key question is: What kind of coverage do you have, and is it based on current employment?
Active Employer Coverage Is Different From Other Insurance
For Medicare coordination purposes, active employer coverage generally means coverage provided through your current employment or your working spouse’s current employment.
This is different from coverage you keep after employment ends. The distinction matters because Medicare uses specific coordination rules to determine which plan pays first.
If the employer has 20 or more employees
If you are age 65 or older and covered through the current employment of an employer with 20 or more employees, the employer group health plan generally pays first. Medicare pays second if you are enrolled.
In this situation, you may be able to delay Part B while the qualifying active employer coverage continues without triggering the usual Part B late-enrollment penalty. When the employment or qualifying coverage ends, you generally have an 8-month Special Enrollment Period to enroll in Part B.
The rules can also apply when coverage comes through a working spouse’s employer.
If the employer has fewer than 20 employees
If the employer has fewer than 20 employees, Medicare generally pays first once you become eligible at age 65. The employer plan may pay second.
That means delaying Part B could create a coverage problem. If Medicare is the primary payer and you are not enrolled in Part B, the employer plan may not pay the way you expect for Part B-covered services.
There are exceptions and multi-employer arrangements that can change the result. For example, an employer may participate in a multi-employer group health plan where another participating employer meets the applicable employee threshold. Your benefits administrator must confirm how your specific plan handles coordination.
The official Medicare “Who Pays First?” guidance provides a useful starting point.
“Who Pays First?” Is More Than a Technical Phrase
Coordination of benefits determines which insurance company processes a claim first.
The primary payer reviews the claim under its coverage rules. A secondary payer may then consider eligible costs that the primary plan did not pay, but secondary coverage does not automatically pay every remaining balance.
For example, imagine you are 66, still working, and covered by a group plan through an employer with 75 employees. If the employer plan pays first, Medicare may pay second if you are enrolled in Part B and the service is covered by Medicare.
Now consider a 66-year-old employee at a company with 12 employees. If Medicare is primary, the employer plan may expect Medicare to pay its share first. Without Part B, you could face unpaid claims, unexpected costs, or disputes over which plan was supposed to pay.
Your doctor and other providers also need accurate information about your coverage. If Medicare and your employer plan do not have current coordination information, claims can be delayed or sent to the wrong payer.
COBRA Does Not Equal Active Employer Coverage
COBRA allows eligible employees and dependents to continue an employer health plan after certain employment or family-status changes. However, COBRA is continuation coverage after active employment has ended; it is not the same as coverage based on current employment.
For Part B timing, relying on COBRA instead of enrolling in Medicare can be risky. COBRA generally does not give you the same protection as qualifying active employer coverage, and it does not replace the need to understand your Part B enrollment deadline.
Medicare generally pays first for people age 65 or older who have Medicare and COBRA. COBRA may pay second, subject to the plan’s terms.
COBRA prescription coverage may be considered creditable coverage for Part D (Medicare prescription drug coverage) if the plan confirms that it meets Medicare’s standard. That can affect a Part D late-enrollment penalty, but it does not automatically protect you from a Part B late-enrollment penalty.
These are separate rules. Do not assume that creditable drug coverage means you can delay every part of Medicare.
Retiree Coverage Is Also Different
Retiree coverage is coverage provided through a former employer or union after you retire or otherwise leave active employment.
Medicare generally pays first for people with retiree coverage. The retiree plan may pay second, but it may require you to enroll in both Part A and Part B before it pays its full benefits.
Some retiree plans can change premiums, benefits, or coordination rules. Others may provide only limited supplemental protection. Review the plan’s summary plan description and ask the benefits administrator exactly what happens if you do not enroll in Part B.
Do not treat retiree coverage as a substitute for active employer coverage without confirming the plan’s written rules.
Marketplace and Individual Coverage Do Not Create the Same SEP
Marketplace coverage, an individual health plan, or coverage purchased directly from an insurer is not the same as a group health plan based on current employment.
If you are eligible for Medicare and delay Part B while relying on Marketplace or individual coverage, you may not receive the same Special Enrollment Period available to someone covered through qualifying active employment. Losing Marketplace coverage generally does not create the active-employment 8-month Part B SEP.
Marketplace financial assistance can also change when you become eligible for Medicare. Before keeping or ending an individual policy, confirm how Medicare eligibility affects your premiums, tax credits, and enrollment obligations.
What About Prescription Drug Coverage?
Part D has its own creditable-coverage rules.
Your employer or union should generally provide a notice explaining whether its prescription drug coverage is creditable (meaning it is expected to pay, on average, at least as much as standard Medicare prescription drug coverage). Keep these notices with your Medicare records.
If you have creditable prescription drug coverage, you may be able to delay Part D without a late-enrollment penalty as long as you avoid a break in creditable coverage of 63 days or more.
However, Part D decisions can affect employer or union coverage. In some situations, enrolling in Medicare drug coverage can cause you or your dependents to lose employer-sponsored health or prescription benefits. Always ask the benefits administrator before enrolling in Part D or another Medicare plan.
A Practical Checklist Before Delaying Part B
Use these steps before making a decision:
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Confirm the employer’s size. Ask how many employees are counted for Medicare coordination purposes. If the employer participates in a multi-employer plan, ask whether the arrangement changes which plan pays first.
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Verify that coverage is based on active employment. Confirm whether you are actively working or covered through a currently working spouse. COBRA, retiree coverage, Marketplace coverage, and individual coverage should be evaluated separately.
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Ask the benefits administrator who pays first. Request the answer in writing if possible. Ask specifically how the plan processes doctor visits, outpatient care, durable medical equipment, and other Part B services.
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Verify prescription drug creditability. Ask whether the plan’s drug coverage is creditable for Part D and retain the annual notice.
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Check automatic enrollment. If you already receive Social Security benefits, you may be automatically enrolled in Medicare. Review your Medicare information carefully and contact Social Security if you believe Part B should be delayed or declined.
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Document the end of active coverage. Keep your termination notice, plan documents, and employment dates. Social Security or Medicare may require proof of qualifying employer coverage, often through employment verification documentation.
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Contact Social Security or Medicare before delaying Part B. Get confirmation based on your circumstances before declining or postponing coverage. You can also contact the Medicare Benefits Coordination & Recovery Center at 1-855-798-2627 with questions about who pays first.
The official Medicare coordination booklet explains common situations, but it also notes that coordination rules do not cover every circumstance.
Total Benefit Solutions Can Help You Ask the Right Questions
Medicare and employer coverage can work well together, but only when the coordination is understood before a coverage decision is made.
At Total Benefit Solutions, we help employees, employers, and small-business owners organize the relevant information, identify the questions that need answers, and understand how different coverage options may fit together. We act as an independent benefits guidance and advocacy partner: not as a replacement for Social Security, Medicare, or legal counsel.
If you are approaching age 65, do not wait until your employment ends to begin reviewing your options. Visit www.totalbenefits.net or call (215) 355-2121 to discuss your benefits coordination questions and determine your next steps.
This article is for general educational purposes only. Medicare rules, employer plan provisions, and enrollment outcomes vary by situation. It is not individualized legal, tax, or financial advice.
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