Working Past 65 at a Small Employer? Why Medicare Is Primary in 2026

Quick Answer: If you work past 65 at a company with fewer than 20 employees, Medicare — not your group plan — is your primary insurance. Your employer's plan is only required to pay as the secondary payer, which means it can process your claims as if Medicare had already paid its share, even if you never enrolled. Skipping Part B (standard 2026 premium: $202.90/mo) at a small employer can leave you effectively uninsured for the bulk of every bill.

The "delay Medicare while you're still working" advice you hear everywhere is written for people at large employers. At 20 or more employees, the group plan stays primary and delaying Part B is usually safe. Under 20, the entire logic flips — and nobody is required to warn you.

The under-20 rule, in plain terms

Federal coordination-of-benefits rules decide who pays a claim first:

Your situation at 65+	Who pays first	Is delaying Part B safe?
Working, employer has 20+ employees	Your group plan	Generally yes — you keep an 8-month Special Enrollment Period for later
Working, employer has fewer than 20 employees	Medicare	No — the group plan can pay only the secondary share
Retired, on COBRA or retiree coverage	Medicare	No — these do not count as current employment coverage

When Medicare is primary and you have not enrolled, there is no primary payer. A small-employer plan can legally reduce its payment to what it would have owed after Medicare — often 20% or less of the bill — leaving the "Medicare share" of a hospital stay at Orlando Health or AdventHealth on your kitchen table.

Why this trap is so quiet

• Your employer may not know. Small businesses in Winter Park and Altamonte Springs rarely have a benefits department. The owner buys a group plan from a broker; nobody tracks which employees are turning 65.
• The insurer finds out later. Carriers routinely audit claims for Medicare eligibility. The plan pays normally for a while — then recodes you as Medicare-primary and starts paying secondary, sometimes retroactively requesting refunds from providers.
• The premium keeps coming out of your paycheck. Nothing about your deductions changes, so everything feels fine until a large claim hits.

The three-step check for anyone 65+ at a small company

1. Count employees honestly. The rule keys on the employer's total employee count (there are technical details around the 20-week test and common ownership — a licensed agent or the plan administrator can confirm your plan's status). Anywhere near the line, get the answer in writing.
2. Ask the plan directly: "Am I Medicare-primary under this plan at 65?" The plan document answers this; some small-group plans even require Medicare enrollment at 65.
3. If Medicare is primary — enroll in Part A and Part B on time. Your Initial Enrollment Period runs around your 65th birthday. From there, you can decide with an agent whether the group plan is still worth keeping as secondary coverage, or whether a Medicare Supplement or Medicare Advantage arrangement fits better. In 2026 the Part B deductible is $283 for the year; many find full Medicare coverage compares surprisingly well against a small-group premium.

"But my group plan is good — can't I just keep it?"

You can keep it — the question is what it pays once you are 65. Keeping a small-group plan and enrolling in Medicare on time is a perfectly reasonable arrangement: Medicare pays first, the group plan can pick up some of the remainder. What does not work is keeping the group plan instead of Medicare. The plan's own coordination rules defeat that plan the day a real claim arrives.

There is also a cost question worth running honestly: for many Central Florida employees at small firms, the paycheck deduction for the group plan costs more than a well-chosen Medicare arrangement. Once Medicare is primary anyway, paying group-plan premiums for secondary coverage deserves a hard look.

Spouses are on this clock too

If your spouse is covered under your small-employer plan and turns 65, the same rule applies to them: Medicare becomes their primary payer. A younger spouse under 65 stays on the group plan normally — the rule keys on each person's own Medicare eligibility.

Frequently Asked Questions

How do I find out if my employer is over or under 20 employees? Ask whoever administers the health plan — the count that matters is defined by federal rules and your insurer applies it. If the business hovers around 20 with seasonal staff, treat the answer as "under 20" until proven otherwise; the cost of guessing wrong is asymmetric.

Does the under-20 rule mean I have to drop my group plan? No. It means Medicare must be in place as primary. Whether to keep the group plan as secondary is a math question — premiums versus what it actually picks up — that is worth walking through with a licensed agent.

I'm at a small employer, 66, and never enrolled in Part B. How bad is it? Act now rather than waiting. You may still be inside a Special Enrollment Period depending on your work status, and if not, the General Enrollment Period (January–March) is the recovery path. The sooner you enroll, the smaller any late-enrollment penalty and the shorter the exposure window.

The bottom line for small-company employees

The under-20 rule is one of the few Medicare provisions where doing nothing is the most expensive choice available. If you take one action after reading this, make it the written question to your plan administrator: "At 65, is Medicare primary under this plan?" A yes answer starts a straightforward enrollment conversation. Every month of ambiguity is a month where a hospitalization bills against coverage that may only pay a fraction. And if you manage or own a small business in Central Florida, forward this to any employee approaching 65 — they will not hear it from the insurance company, and the fix costs nothing when done on time.

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Important Notice: We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE (1-800-633-4227) to get information on all of your options.