Updated April 2026 · Florida Plan Finder · Licensed Florida Health Insurance Producer

Handling Medicare-Eligible Employees in Florida Small Business Health Plans

Florida small businesses with under 20 employees face unique rules when an employee turns 65 and becomes Medicare-eligible. Under Medicare Secondary Payer (MSP) rules, Medicare is the PRIMARY payer for employees of small employers (under 20 EE) — meaning the employer's group health plan becomes secondary. This affects coverage value, the cost-benefit calculation for the employee of staying enrolled, and the administrative complexity of handling claims. For employers with 20+ employees, the rules reverse and the group plan stays primary.

Medicare Secondary Payer Rules — Under 20 EE

For an employer with fewer than 20 employees:

• Medicare is PRIMARY for Medicare-eligible employees and Medicare-eligible spouses
• Group health plan is SECONDARY (pays whatever Medicare doesn't)
• Employee can decline group coverage and rely on Medicare alone
• Employee can decline Medicare Part B without penalty if remaining on group coverage that has 'creditable coverage' status

Medicare Secondary Payer Rules — 20+ EE

For an employer with 20 or more employees:

• Group health plan is PRIMARY for active employees age 65+
• Medicare is SECONDARY
• Employee can defer Medicare enrollment without penalty while actively employed

The 20-Employee Counting Rule

The MSP threshold uses a different counting method than ACA: an employer is in the 20+ category if they had 20 or more full and part-time employees on at least 20 calendar weeks in the current or preceding calendar year. Counting is at the employer level (no controlled-group aggregation for MSP).

Decision Framework for Medicare-Eligible Employee

HSA Contribution Termination

Medicare enrollment ends HSA contribution eligibility. Once an employee enrolls in any part of Medicare (Part A, B, C, or D), they cannot make further HSA contributions. The existing HSA balance can still be used for qualified expenses; only new contributions are blocked.

Tactical implication: Florida small business HSA participants approaching 65 may want to delay Medicare Part A enrollment if continuing HSA contributions is financially valuable.

Part D Creditable Coverage Notice

Each year by October 14, employers offering prescription drug coverage to Medicare-eligible employees must distribute a 'Creditable Coverage' notice indicating whether the employer plan's drug coverage is at least as good as Medicare Part D. The notice helps employees decide whether to enroll in Part D (creditable employer coverage avoids the late enrollment penalty if they enroll later).

Medicare Premium Reimbursement Limitations

Florida small businesses generally CANNOT reimburse Medicare premiums for active employees through standard payroll mechanisms — that would violate Medicare Secondary Payer rules (an employer can't 'incentivize' employees to drop group coverage in favor of Medicare). Limited exceptions exist through certain HRA structures (specifically permitted Medicare premium reimbursement HRAs). Consult a benefits attorney before using one.