Delaware QMB Balance Billing Protection: What to Do When a Doctor Bills You

A bill arrives from a doctor's office or hospital for hundreds of dollars in Medicare deductibles or coinsurance — even though your parent is enrolled in QMB. This happens more often than it should, and the bill is illegal. Federal law prohibits providers from collecting Medicare cost-sharing from QMB beneficiaries, full stop.

What the Law Says

Under Section 1902(n)(3)(B) of the Social Security Act and 42 CFR 447.15, Medicare-enrolled providers cannot charge QMB beneficiaries for any Medicare Part A or Part B cost-sharing. That includes:

• Part A hospital deductible ($1,736 per benefit period in 2026)
• Part B annual deductible ($283 in 2026)
• Part B coinsurance (the standard 20% of approved charges)
• Copayments for outpatient services, doctor visits, therapy, and durable medical equipment

This protection applies under both Original Medicare and Medicare Advantage plans. The billing prohibition is not optional and doesn't depend on whether Medicaid actually pays the provider anything on the crossover claim.

Why Delaware Providers Still Send Bills

Delaware Medicaid uses a "Lesser-Of" reimbursement formula for Medicare crossover claims. The state pays either the full Medicare cost-sharing amount or the difference between the Medicaid fee schedule and what Medicare already paid — whichever is less. Because Medicare rates typically exceed Delaware Medicaid rates, the Medicaid crossover payment is often $0.

Some billing departments see that $0 Medicaid payment and assume the patient owes the balance. They don't. Medicare's payment plus the state's crossover adjudication constitutes full payment by law. The provider must write off the remaining deductible and coinsurance — not transfer it to the patient.

How to Dispute an Improper Bill

If your parent gets a bill for Medicare cost-sharing while enrolled in QMB:

Step 1: Verify coverage dates. Confirm the date of service falls within an active QMB approval period. Check the DSS Notice of Decision or the ASSIST portal.

Step 2: Contact the billing office. Call the provider's billing department. Tell them the patient has active QMB status and that balance billing is prohibited under federal law. Provide the Medicare Summary Notice or Explanation of Benefits showing QMB protections. Ask for an immediate claim adjustment and a zero-balance statement.

Step 3: Send it in writing. If the phone call doesn't resolve it, mail a written dispute letter with a copy of the DSS QMB Approval Notice and a reference to CMS's "Prohibition on Balance Billing QMBs" guidance. Request written confirmation that the balance has been cleared.

Step 4: Escalate. If the provider refuses to adjust or sends the account to collections, you have two escalation paths:

• Call 1-800-MEDICARE and file a formal QMB balance billing complaint. CMS can advise the provider to stop billing and refund amounts already collected; providers that keep billing QMB beneficiaries may face sanctions.
• Contact the Delaware Medicare Assistance Bureau (DMAB) at 1-800-336-9500 for local casework intervention, or reach out to Community Legal Aid Society, Inc. (CLASI) for legal representation if the provider is unresponsive.

Collections and Credit Reporting

A provider who sends a QMB patient's balance to a collection agency is violating the same law. If this has happened, report the collection activity to CMS and request that the provider stop collection and refund any amounts already collected. Document everything — the original bill, the collection notice, and your written dispute — because that paper trail supports the complaint.

Preventing Future Bills

QMB status isn't always visible in a provider's billing system on the date of service. Two practical steps reduce the chance of improper bills:

• Bring a copy of the DSS QMB Approval Notice to every appointment and ask the front desk to note QMB status in the billing record
• Request a Medicaid card or ASSIST eligibility printout to present at check-in

Our Delaware Medicare Savings Programs, Extra Help & DPAP Guide includes a ready-to-send billing dispute letter template with the specific federal citations, plus the complete escalation protocol for Delaware providers.

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