By David Holt – June 5, 2025
For providers who treat Medicare beneficiaries, the rules around accepting cash payments are anything but straightforward. While it may seem reasonable to allow a patient to pay out-of-pocket for convenience or privacy, federal law places strict limits on when that’s allowed.
Below, we break down when Medicare patients can legally pay cash, when they can’t, and what documentation is required to protect your practice.
Can Medicare-Enrolled Providers Accept Cash Payments Without Submitting Claims?
No. If you’re enrolled in Medicare, you cannot legally accept cash from a Medicare beneficiary for a covered service without submitting a claim to Medicare.
This rule is codified in Section 1848(g)(4)(A) of the Social Security Act, which mandates that all providers and suppliers must submit claims to Medicare for any covered items or services delivered to Medicare beneficiaries. The law applies regardless of whether you “accept assignment.”
To clarify:
- Participating providers agree to accept Medicare’s approved amount as full payment and can only bill the patient for applicable deductibles or coinsurance.
- Non-participating providers may charge up to 115% of the Medicare-approved amount (known as the “limiting charge”), but they are still required to submit claims for any covered service.
The only exception to this rule is for providers who have formally opted out of Medicare and entered into valid private contracts with Medicare patients under 42 C.F.R. § 405.405. Without completing this process, any private-pay arrangement is considered invalid—and billing the patient directly could constitute a violation of Medicare law.
When Can Providers Accept Cash Payments from Medicare Beneficiaries?
There are limited, but important, exceptions when Medicare providers may accept direct payment:
1. For Services That Are Not Medically Necessary
Medicare only covers services that are deemed “medically necessary” under 42 U.S.C. § 1395y(a)(1)(A). That means services must be required for diagnosing, treating, or managing a medical condition.
If a patient requests a service that does not meet Medicare’s definition of medical necessity—such as a test performed outside the normal frequency limit or a wellness screening without clinical indications—then the provider may collect payment only if an Advance Beneficiary Notice (ABN) is issued before the service is provided.
The ABN is a required legal document that informs the patient Medicare is likely to deny the claim, and that they will be responsible for the full cost. It allows the patient to make an informed decision about whether to proceed with the service and accept the financial risk.
2. For Services That Medicare Never Covers
Some services are categorically excluded from Medicare coverage under 42 U.S.C. § 1395y(a)(10)—meaning they are never reimbursed, regardless of the clinical situation. These include:
- Cosmetic procedures (e.g., Botox for aesthetic purposes, dermal fillers)
- Holistic wellness or non-clinical lifestyle services
- Some concierge or executive physical programs
In these cases, you are allowed to accept cash payments. While an ABN is not required, it is strongly recommended that providers issue a written notice to the patient stating:
- That the service is not covered by Medicare,
- What the estimated cost is,
- That the patient is responsible for the full amount.
Doing so protects both the provider and the patient by reducing the risk of confusion, audits, or complaints.
The Role of Advance Beneficiary Notices (ABNs)
The Advance Beneficiary Notice of Noncoverage (ABN) is the most important tool in ensuring that you comply with Medicare billing rules when a patient chooses to pay privately for a non-covered or likely-not-covered service.
Here’s what you need to know:
When Is an ABN Required?
- For potentially non-covered services: If you believe Medicare will deny a claim due to lack of medical necessity (e.g., a lab panel that exceeds frequency limits or a patient-requested screening), you must issue an ABN before providing the service.
- For never-covered services: An ABN is not required by law, but issuing a clear written statement of non-coverage is considered best practice.
What Should the ABN Include?
- A clear description of the services provided
- An estimated cost (accurate within $100 or 25%)
- A statement that the patient will be personally responsible for payment if Medicare denies the claim
Use of the GA Modifier
When you issue an ABN and still choose to submit a claim to Medicare (for documentation or tracking purposes), attach the GA modifier to the claim. This signals that the ABN was provided and Medicare should deny the claim, allowing the provider to collect payment from the patient.
Why This Matters
Some providers believe they can simply have the patient sign a waiver or “pay privately,” but that doesn’t bypass federal law. The mandatory claim submission rule still applies unless you have opted out or you’ve followed ABN procedures for non-covered services.
Even honest mistakes—such as failing to realize Medicare is a patient’s secondary insurance—can lead to payment demands or audits. For that reason, your intake and verification procedures must be airtight. If Medicare eligibility is discovered after the fact, and no ABN was issued, you may be required to refund the patient and face penalties.
Final Thoughts
If you’re a Medicare-enrolled provider, you can’t simply decide to operate a cash-pay model for covered services. The safest legal approach is to either opt out entirely or structure your services within the strict bounds of Medicare billing rules. Whenever you’re unsure, issue clear notices, verify eligibility in advance, and document everything thoroughly.
SOURCE: Holt Law
This is at odds with the Title 45 of the Code of Federal Regulations which indicates:
- When a patient says: “Do not bill my insurance and do not send them any information about this visit. I’ll pay for it myself,”…the provider is legally required to comply.
- Under HIPAA a patient can request that a provider not disclose their protected health information (PHI) to an insurance company if BOTH of the following are true:
1 The patient requests a restriction, and
2 The patient pays the provider in full, out of pocket for the service in question.
Which takes precedent over the other?
