IRMAA Basics
How Medicare and COBRA Benefits Coordinate for Enrollment
Verified against SSA POMS as of September 7, 2026
The short answer
COBRA, introduced under the Consolidated Omnibus Budget Reconciliation Act, allows individuals to extend their employer group health plan coverage under certain qualifying events. For those eligible for Medicare, COBRA generally pays secondary. Coordination rules vary, such as COBRA being the primary payer for individuals with End-Stage Renal Disease (ESRD) during the first 30 months of Medicare eligibility.
What is COBRA?
COBRA is a federal law that permits individuals to continue their employer-sponsored health plan coverage for a limited time after losing coverage due to employment changes, aging out, or other qualifying events. Typically, COBRA applies to employers with 20 or more employees, but some states have regulations for employers with fewer than 20 employees. COBRA coverage is generally available for 18 to 36 months, depending on the qualifying event. The cost of COBRA coverage is generally the sum of the employee and employer contributions plus up to a 2% administrative fee, totaling up to 102% of the full premium cost. For the most comprehensive information on COBRA, visit the Department of Labor website (dol.gov).
MCR:basics/get-started-with-medicare/medicare-basics/working-past-65/cobra-coverage View source ›How COBRA and Medicare Coordinate
When an individual is eligible for both Medicare and COBRA, typically, Medicare pays first, and COBRA pays second. If an individual has Medicare due to End-Stage Renal Disease, COBRA pays primary for the first 30 months of Medicare eligibility. For those aged 65 or older and covered by both Medicare and COBRA, Medicare pays first. If the individual becomes eligible for Medicare after electing COBRA, the COBRA plan may end if it was partly due to their eligibility for Medicare.
CMS:medicare/coordination-benefits-recovery/overview/secondary-payer View source ›COBRA Coverage Eligibility and Conditions
Individuals experiencing specific life events such as employment termination, reduction in employment hours, or changes in family structure (e.g., divorce) are eligible for COBRA. They must notify their plan administrator within 60 days of the event to be eligible for COBRA. Furthermore, an employer must inform the plan administrator to initiate COBRA coverage availability.
MCR:basics/get-started-with-medicare/medicare-basics/working-past-65/cobra-coverage View source ›Coordination with Employer Health Plans
If an individual has an employer plan where Medicare is the secondary payer and then opts for COBRA, the employer's group health plan requirements under the Medicare Secondary Payer rules continue. This applies in cases of working-aged benefits, disability, and end-stage renal disease during the first 30 months.
CMS:medicare/coordination-benefits-recovery/overview/secondary-payer View source ›Decision-Making for Enrollment
Individuals should carefully assess the interaction between COBRA and Medicare benefits, particularly to avoid coverage gaps and late enrollment penalties. It is advised to enroll in Medicare Part B when first eligible to avoid penalties, as electing COBRA does not exempt an individual from these penalties.
MCR:basics/get-started-with-medicare/medicare-basics/working-past-65/cobra-coverage View source ›Frequently asked
How long does COBRA coverage last with Medicare?
COBRA coverage generally lasts 18 months, but can extend to 36 months in certain cases. However, if you have COBRA before signing up for Medicare, your COBRA coverage will likely end once you enroll in Medicare. You have up to 8 months after you stop working or lose your health insurance to sign up for Medicare Part B without a penalty, regardless of whether you choose COBRA. Missing this enrollment period means you'll need to wait until January 1 - March 31 to sign up, with coverage starting the month after you enroll. This could lead to a coverage gap and a lifetime Part B late enrollment penalty. To avoid unexpected medical bills, consider signing up for Medicare as soon as you are eligible. For personalized assistance, contact your State Health Insurance Assistance Program (SHIP).
When does Medicare pay first if I have COBRA?
If you are 65 or older and also have COBRA, Medicare typically pays first. Also, if you develop a disability aside from ESRD, Medicare remains the primary payer with COBRA as secondary.
What happens to my COBRA if I become eligible for Medicare?
If you become eligible for Medicare after electing COBRA, you are still eligible to retain your COBRA plan, but it generally becomes secondary to Medicare. However, if you have COBRA before signing up for Medicare, your COBRA coverage will likely end once you enroll in Medicare. You have up to 8 months after you stop working, or lose your health insurance if that happens first, to sign up for Part B without incurring a penalty, regardless of whether you choose COBRA. Missing this enrollment period means you'll have to wait until January 1 - March 31 to sign up, with coverage starting the month after you enroll, potentially causing a gap in your coverage. Additionally, you may face a lifetime Part B late enrollment penalty. To avoid unexpected medical bills, consider signing up for Medicare as soon as you are eligible. For free, personalized assistance, contact your State Health Insurance Assistance Program (SHIP).
Are there any exceptions where COBRA pays before Medicare?
Yes, during the ESRD coordination period of 30 months, COBRA pays primary, with Medicare as secondary.
What should I consider when choosing between COBRA and Medicare?
Carefully consider potential gaps in coverage, the cost, and whether enrolling in Medicare Part B might avoid penalties. If you have COBRA before signing up for Medicare, your COBRA will probably end once you sign up for Medicare. You have up to 8 months after you stop working (or lose your health insurance, if that happens first) to sign up for Part B without a penalty, regardless of whether you choose COBRA. Missing this period means you'll have to wait until January 1 - March 31 to sign up, with coverage starting the month after you sign up. This delay may cause a gap in your coverage, and you could incur a lifetime Part B late enrollment penalty. To avoid unexpected medical bills, consider signing up for Medicare as soon as you are eligible. Contact your State Health Assistance Program (SHIP) for free, personalized help with this decision.