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Medicare coordination for employers

Medicare and Employer Group Health Coverage

Organize the questions employees and spouses should review when Medicare and active employer coverage overlap

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Medicare does not coordinate with every employer plan in the same way. Employer size, the reason for Medicare eligibility, current-employment status, prescription coverage, and HSA contributions can all affect the next step. Employees should confirm their personal enrollment timing with Medicare, Social Security, the group plan, and qualified advisers.

01

Start with employer size and employment status

For a person age 65 or older covered through current employment, Medicare generally pays first when the employer has fewer than 20 employees. The group health plan generally pays first when the employer has 20 or more employees. Multi-employer arrangements and special exceptions can change the result.

02

Use the separate disability threshold

When Medicare eligibility is based on disability, the large-group threshold is generally 100 or more employees. The employee’s own current employment or a family member’s current employment can be relevant, so the plan and Medicare should confirm the payer order.

03

Document prescription-drug creditable coverage

Plans offering prescription coverage must determine whether that coverage is creditable for Medicare Part D and provide required notices to Medicare-eligible individuals. Employers should also confirm who completes the annual disclosure to CMS.

04

Coordinate Medicare enrollment and HSA contributions

A person enrolled in Medicare generally cannot remain eligible to contribute to an HSA. Because Medicare Part A can sometimes begin retroactively, employees approaching Medicare should discuss the HSA contribution stop date with Medicare, Social Security, payroll, and a tax adviser before enrolling.

Official resources

Confirm current requirements with the responsible agencies.

Rules and annual limits can change. Use these primary sources with your plan documents and qualified professional advice.

Primary source

CMS: Medicare Secondary Payer overview

Open official guidance Primary source

CMS: Employer and union Medicare resources

Open official guidance Primary source

CMS: Part D creditable coverage

Open official guidance Primary source

IRS: Health Savings Accounts and other tax-favored plans

Open official guidance
Official resources reviewed August 2026.

Local employer support

We help employers compare, implement, and service coverage.

Compare

See the tradeoffs clearly.

CostEmployer contribution, employee payroll deductions, and renewal impact.
AccessCarrier networks, doctors, hospitals, referrals, and service areas.

Enroll

Keep employees informed.

TimelineEffective dates, form deadlines, first invoice, and ID card expectations.
SupportEmployee questions, carrier portals, enrollment changes, and billing setup.

Renew

Review before rates change.

StrategyRenewal alternatives, plan changes, contribution adjustments, and employee choice.
ServiceClaims questions, eligibility updates, billing issues, and carrier follow-up.

From our clients

Trusted employer benefit guidance from a local team.

FAQ

Frequently asked group health questions

Does an employee have to leave the group plan at age 65?

Not necessarily. Many employees and spouses continue active-employment group coverage after age 65. The employer size, plan rules, payer order, cost, HSA situation, and Medicare enrollment deadlines should all be reviewed before changing coverage.

Which pays first when an employee has Medicare and group coverage?

For working-aged coverage, Medicare generally pays first when the employer has fewer than 20 employees, while the group plan generally pays first at 20 or more. Disability-based Medicare generally uses a 100-employee threshold. Exceptions can apply, so confirm with the plan and Medicare.

What is a Part D creditable-coverage notice?

It tells Medicare-eligible individuals whether the employer prescription coverage is expected to pay, on average, at least as much as standard Medicare drug coverage. The notice can affect an individual’s Part D timing and potential late-enrollment penalty.

Can an employee keep contributing to an HSA after enrolling in Medicare?

A person enrolled in Medicare generally is not eligible to contribute to an HSA. Medicare enrollment can sometimes be retroactive, so the employee should coordinate the stop date with Medicare, Social Security, payroll, and a tax adviser.

Ready for a group quote?

Choose how to complete your census.

Use our guided online form, or complete the Excel template and upload it securely. Both options give us the information needed to prepare your group quote.

Option 1 · Recommended

Complete it online

Enter your company and employee information in one guided form. Nothing to download or upload.

Start Online Census
Option 2 · Spreadsheet

Complete it offline

Prefer Excel? Download the template, complete it at your convenience, then return to upload it securely.

1. Download Template 2. Upload Securely

Please do not send census information through regular email. Use the online form or secure upload portal above.

Ready to compare group health?

Review group health options with an advisor.

Share a few business details and a licensed Skyline Benefit advisor will follow up within one business day.

  • Carrier and program comparisons
  • Employer contribution and payroll-cost review
  • Enrollment, renewal, and ongoing support

Review group health options with an advisor.

For California employers with 1–100 employees.

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