FEHB to Medicare: Your Transition Playbook
When you turn 65, Medicare becomes available , and the interplay with FEHB is one of the most consequential financial decisions of your retirement. Get it wrong and you either overpay for coverage you do not need or leave yourself exposed in ways you will not discover until you have a claim.
Most federal retirees who kept FEHB into retirement should enroll in Medicare Part A (it is free and has no downside). Part B is the real decision: it costs $185/month or more in 2025 and offers real value only if your FEHB plan does not already cover what Part B covers at lower total cost.
Medicare Parts A and B: What Each Covers
Medicare Part A covers hospital inpatient care, skilled nursing facility care (up to 100 days), some home health services, and hospice care. For most federal retirees, Part A is premium-free because you paid Medicare taxes throughout your career (or at least 40 quarters worth).
Medicare Part B covers outpatient services: physician visits, lab work, imaging, durable medical equipment, preventive care, and outpatient surgery. Part B has a monthly premium , $185/month for most retirees in 2025, rising to $628/month at the highest income tier ($500,000+ for married couples). There is also a 20% coinsurance after the annual deductible ($257 in 2025).
Medicare Part D covers prescription drugs. Most federal retirees who keep FEHB do not need a separate Part D plan , FEHB drug coverage is typically equivalent or superior, and OPM has stated that FEHB drug coverage is creditable for Medicare Part D purposes. Enrolling in a separate Part D plan while keeping FEHB is redundant and wasteful for most people.
The Case for Keeping FEHB Without Medicare Part B
FEHB plans, especially Blue Cross Blue Shield's Standard option (one of the most popular among retirees), already provide comprehensive coverage for outpatient services, physician visits, and lab work. Many FEHB plans have relatively low out-of-pocket maximums , $6,000-$8,000 per year for Self Plus One in many plans.
If you are healthy and have low expected healthcare utilization, FEHB alone may cost less in total (premium + out-of-pocket) than FEHB + Part B. Adding Part B at $185/month ($2,220/year) for a couple means $4,440/year in additional premiums alone , before you see any claim. You would need to generate significant Part B claims to break even on that cost.
The strongest argument against Part B: FEHB is your primary insurer when you do not have Part B. Claims that Medicare Part B would cover (like outpatient physician visits) go to FEHB instead. If your FEHB plan covers those claims well, you may not miss Part B at all. Consult a specific FEHB plan summary of benefits before drawing conclusions , plan quality varies significantly.
The Case for Adding Medicare Part B
When you add Medicare Part B and keep FEHB, the two programs coordinate to cover nearly all your healthcare costs. Medicare Part B pays first (as primary) for outpatient services, covering 80% after the deductible. FEHB then covers much or all of the remaining 20%. Your total out-of-pocket for physician and outpatient services drops to near zero in many cases.
For retirees with chronic conditions, cancer history, or high healthcare utilization, this coordination can save more than the Part B premium cost. A retiree managing diabetes with frequent specialist visits, lab work, and ongoing medications might see $5,000-$8,000/year in FEHB claims that become near-zero with Part B coordination , easily justifying the $2,220/year in Part B premiums.
Part B also reduces the FEHB plan's liability, which is one reason OPM has historically offered premium incentives for retirees who enroll. As of January 2025, FEHB plans coordinate benefits with Medicare Part B in ways that can eliminate almost all out-of-pocket costs for Medicare-covered services. The new Medicare Advantage for FEHB options introduced in recent years also shift the calculation for some retirees.
Income-Related Monthly Adjustment Amount (IRMAA)
If your Modified Adjusted Gross Income (MAGI) was above $106,000 (single) or $212,000 (married filing jointly) two years prior, you pay a higher Part B premium , the Income-Related Monthly Adjustment Amount. IRMAA tiers for 2025 range from $185/month to $628/month per person.
A married couple with $250,000 MAGI pays $296/month each for Part B , $7,104/year combined. That premium level changes the break-even analysis significantly. At that cost, Part B needs to produce substantial out-of-pocket savings to pay off.
IRMAA is based on income two years prior. If you retired in 2024 and had high employment income that year, your 2026 Part B premium will reflect that. You can appeal IRMAA if your income has since dropped due to a qualifying life event (retirement is one). File a Life Changing Event appeal with SSA using Form SSA-44.
Enrollment Timing: Do Not Miss the Windows
You are automatically enrolled in Medicare Part A when you turn 65 if you are already receiving Social Security. If you have not claimed Social Security, you must actively enroll in Part A , the Initial Enrollment Period runs from 3 months before your 65th birthday through 3 months after it.
Part B also has an Initial Enrollment Period. If you delay Part B and miss it without a qualifying Special Enrollment Period, you will pay a late enrollment penalty: 10% per year of delay, permanently added to your premium. A 2-year delay means a 20% premium surcharge for the rest of your life.
Federal retirees who remain employed past 65 with employer coverage have a Special Enrollment Period when they separate. But FEHB in retirement is not "employer coverage" in the Medicare sense , OPM has clarified that FEHB in retirement does NOT qualify as employer coverage for purposes of the Part B Special Enrollment Period. Delaying Part B enrollment past 65 while relying only on FEHB (in retirement) will trigger the late penalty.
Important Disclaimers
This content is educational and general in nature. It is not tax, legal, or investment advice for your specific situation. Rules for FERS, TSP, Social Security, Medicare, and tax treatment change and can depend on factors unique to you. Consult a qualified tax professional, attorney, or CFP professional before acting on any of the strategies discussed here. PlanWell Financial Planning, LLC is not affiliated with or endorsed by OPM, the U.S. Office of Personnel Management, or any federal agency.
Decision Framework
Use this matrix to map your situation to a recommended action. These are starting points, not final answers.
| Your Scenario | Recommended Approach |
|---|---|
| You are 64, retiring next year, and in good health with low healthcare use | Enroll in Part A immediately (free, no downside). Analyze your specific FEHB plan's outpatient coverage before enrolling in Part B. If your FEHB plan covers physician/outpatient well, consider delaying Part B decision 1-2 years and reassessing based on actual utilization. |
| You are 65, have a chronic condition, and use healthcare regularly | Enroll in both Part A and Part B. The coordination of benefits will likely produce net savings that exceed the Part B premium at any meaningful level of utilization. |
| You are 65 with MAGI of $280,000 from investments and pension combined | Calculate your IRMAA tier , you likely pay $296/month per person for Part B. At that cost, model carefully whether Part B coordination savings justify the premium. For a healthy couple with low utilization at this income level, the math may favor FEHB alone. |
| You are 67 and never enrolled in Part B because you thought FEHB was enough | If you missed the Initial Enrollment Period without a valid Special Enrollment Period, you now face the late penalty. Enroll at the next General Enrollment Period (January through March, coverage begins July). Calculate the lifetime penalty cost and whether FEHB alone remains cheaper. |
Free FERS Retirement Workshop
Three hours. No cost. CFP®-led. Join federal employees who walked away with a real plan.
Frequently Asked Questions
Can I drop FEHB once I have Medicare Parts A and B?
Yes, you can drop FEHB voluntarily. But this is a permanent decision , if you drop FEHB in retirement, you cannot re-enroll later. For most federal retirees, keeping at least a lower-cost FEHB plan alongside Medicare provides better coverage coordination than Medicare alone.
Does FEHB cover dental and vision in retirement?
Standard FEHB plans provide limited dental and vision. The Federal Dental and Vision Insurance Program (FEDVIP) is a separate election available to federal retirees. Medicare does not cover routine dental or vision. This is an area where FEHB + FEDVIP combination remains valuable even when Medicare is your primary for medical.
What happens to FEHB if my annuity is not large enough to cover the premiums?
OPM deducts FEHB premiums directly from your annuity. If your annuity is smaller than the premium, you can arrange direct billing. If your annuity is extremely small, you may need to self-pay directly to OPM. The key is that a very small annuity does not disqualify you from FEHB , it just changes how you pay.
If I get Medicare Advantage through an FEHB plan, do I still need to pay Part B?
Some FEHB plans now offer Medicare Advantage options that waive or rebate the Part B premium. These plans are available only to retirees enrolled in both Medicare Part A and Part B. The math can be compelling if the plan's coverage equals your current FEHB plan and the premium rebate is substantial.
My spouse is covered under my FEHB self-plus-one plan and is not yet 65. What happens when I turn 65?
Your FEHB self-plus-one plan continues covering your spouse regardless of your Medicare status. Medicare coordinates with FEHB for your claims; FEHB alone covers your spouse's claims. There is no need to change your FEHB enrollment when you turn 65.
Related decision guides
Get your retirement questions answered
Join a free 3-hour FERS workshop. Bring your numbers. Leave with a plan.