Understanding How Medicare Works as Secondary to Workers' Compensation

What Does "Medicare Secondary to Workers' Compensation" Mean?

When an employee is injured on the job, workers' compensation (WC) is the primary insurer that pays for medical care and wage replacement. Medicare becomes a secondary payer when the injured worker is also enrolled in Medicare (typically because they are over 65 or disabled). In this situation, Medicare only pays after the workers' compensation insurer has exhausted its benefits, according to federal coordination‑of‑benefits (COB) rules.

Key Legal Framework

The relationship is governed by the Medicare Secondary Payer (MSP) statute (42 U.S.C. § 1395y(a)(1)(C)) and the CMS Coordination of Benefits Manual. These rules require WC insurers to submit claim information to Medicare, and Medicare to deny or defer payment when WC is the primary source.

Who Is Affected?

Medicare becomes secondary in three main scenarios:

• Workers 65 years or older who are injured on the job.
• Workers under 65 who become disabled and qualify for Medicare Part A or B.
• Workers who receive Social Security Disability Insurance (SSDI) and are subsequently covered by Medicare.

How Coordination of Benefits Works

The COB process follows a strict order:

Steps for Injured Workers

1. Notify Your Employer and WC Insurer

Report the injury promptly and file a WC claim. The insurer will request medical records and may issue a claim number.

2. Inform Medicare of the WC Claim

When you receive a WC claim number, forward it to Medicare (by calling 1‑800‑MEDICARE or using your MyMedicare account). This alerts Medicare that it is secondary.

3. Submit Medical Bills Correctly

Healthcare providers should bill the WC insurer first. If WC denies a claim, the provider can then bill Medicare, attaching the WC claim number and denial letter.

4. Track Payments and Denials

Maintain a spreadsheet of each bill, the payer, amount billed, amount paid, and any remaining balance. This helps avoid duplicate payments and ensures compliance with COB rules.

Common Pitfalls and How to Avoid Them

• Missing the WC claim number. Without it, Medicare may mistakenly pay as primary, leading to overpayments and potential penalties.
• Billing Medicare before WC. This violates federal law and can result in recoupment of funds.
• Assuming Medicare will cover all non‑WC costs. Medicare only covers services not related to the work injury; unrelated care must be justified.

Impact on Benefits and Payments

Because Medicare is secondary, the total out‑of‑pocket cost for the worker is often lower than if Medicare were primary. However, the worker may still face:

• Deductibles and coinsurance for Medicare‑covered services.
• Potential delays while insurers coordinate payments.

Frequently Asked Questions

Does Medicare ever pay before workers' compensation?

No. By law, WC is always the primary payer for work‑related injuries when the worker is eligible for WC benefits.

What if my employer's WC insurer refuses to pay?

You can file a claim with your state's workers' compensation board. Medicare will still remain secondary, but you may need legal assistance to enforce WC coverage.

Can I receive both SSDI and workers' compensation?

Yes, but both programs have separate eligibility criteria. Receiving WC does not affect SSDI eligibility, but both benefits are considered when determining Medicare entitlement.

Table: Coordination of Benefits Summary

Practical Checklist for Workers

• Report injury within your state's required timeframe.
• Obtain and record the WC claim number.
• Contact Medicare to provide the WC claim number.
• Ensure providers bill WC first, then Medicare.
• Keep detailed records of all communications and payments.

Conclusion

Understanding that Medicare is secondary to workers' compensation helps injured workers avoid costly billing errors and ensures compliance with federal coordination‑of‑benefits rules. By following the steps outlined—prompt reporting, proper notification, and diligent record‑keeping—workers can maximize their entitled benefits while minimizing administrative hassles.