Stark Law and the Anti-Kickback Statute are the two federal rules most likely to turn a routine referral or vendor deal into a compliance problem for a medical practice. In plain terms: the Stark Law limits when a physician can refer Medicare patients to a business the physician has a financial relationship with, and the Anti-Kickback Statute makes it a crime to pay or accept anything of value to steer federal health care business. Keeping both in check is the heart of Stark Law compliance, and getting it wrong is costly. Violations can mean repaid claims, six-figure fines, and even exclusion from Medicare.
This guide explains what each law covers, how they differ, what the penalties are, and the exceptions and safe harbors that keep everyday arrangements legal. It closes with practical steps your practice can take to stay compliant in 2026. It is written for practice owners and administrators rather than attorneys, so the language is deliberately plain. It is general information, not legal advice, and you should confirm specifics with qualified counsel.
What is the Stark Law?
The Stark Law, formally the physician self-referral law under Section 1877 of the Social Security Act (42 U.S.C. § 1395nn), prohibits a physician from referring a Medicare patient for certain “designated health services” to an entity the physician, or an immediate family member, has a financial relationship with, unless a specific exception applies. It also bars that entity from billing Medicare for the improperly referred service.
Two features make the Stark Law unusually strict:
- It is a strict-liability law. The government does not have to prove you intended to break it. If a financial relationship exists and no exception fits, the referral violates the Stark Law even when the care was medically necessary and correctly delivered.
- A “financial relationship” is broad. It covers both ownership or investment interests and compensation arrangements, so an employment contract, a lease, a medical-director stipend, or a stake in an imaging center can all trigger it.
Designated health services (DHS) are the specific services the law watches most closely. Per CMS, they include:
- Clinical laboratory services
- Physical therapy, occupational therapy, and outpatient speech-language pathology services
- Radiology and certain other imaging services
- Radiation therapy services and supplies
- Durable medical equipment and supplies
- Parenteral and enteral nutrients, equipment, and supplies
- Prosthetics, orthotics, and prosthetic devices and supplies
- Home health services
- Outpatient prescription drugs
- Inpatient and outpatient hospital services
Because so many practices offer in-house labs, imaging, or physical therapy, DHS referrals are one of the most common places Stark Law compliance quietly breaks down.
What is the Anti-Kickback Statute?
The Anti-Kickback Statute (AKS), found at 42 U.S.C. § 1320a-7b(b), makes it a federal crime to knowingly and willfully offer, pay, solicit, or receive any “remuneration” to induce or reward referrals of items or services payable by a federal health care program. Remuneration means anything of value. The HHS Office of Inspector General points to examples such as free rent, expensive hotel stays and meals, and excessive compensation for medical directorships or consulting roles.
Two features set the AKS apart from the Stark Law:
- It is intent-based. Prosecutors must show an arrangement was “knowing and willful,” but they do not need a signed agreement. A pattern of payments tied to referrals can be enough.
- It cuts both ways and covers every federal program. Both the party paying and the party receiving a kickback can be charged, and the law reaches Medicare, Medicaid, TRICARE, and other federal programs, not just Medicare.
Unlike the civil Stark Law, an AKS violation is a crime. It can also create False Claims Act liability, because claims tainted by a kickback are treated as false claims.
What is the difference between the Stark Law and the Anti-Kickback Statute?
Practices often blur the two because a single arrangement can violate both at once. Here is how they compare:
| Feature | Stark Law (Physician Self-Referral) | Anti-Kickback Statute (AKS) |
|---|---|---|
| Statute | 42 U.S.C. § 1395nn | 42 U.S.C. § 1320a-7b(b) |
| Type of law | Civil | Criminal, plus civil penalties |
| Intent required | None (strict liability) | Yes (“knowing and willful”) |
| What it targets | Physician referrals for designated health services | Any remuneration to induce or reward referrals |
| Who can be liable | The referring physician and the billing entity | Both the payer and the recipient of the kickback |
| Programs covered | Medicare (and Medicaid) | All federal health care programs |
| Legal cover | Meet a Stark Law exception | Fit within a safe harbor |
| Enforced by | CMS, with the DOJ | HHS-OIG and the DOJ |
What are the penalties for Stark Law and Anti-Kickback violations?
The financial exposure is serious under both laws, and it stacks.
Stark Law penalties are civil but costly:
- The entity must repay the full amount of any claim tied to a prohibited referral, even when the service was medically necessary.
- Knowingly filing those claims can trigger False Claims Act liability, civil monetary penalties, and exclusion from federal health care programs.
- Certain civil monetary penalty amounts are adjusted periodically for inflation, so current figures should be confirmed with counsel or the CMS regulations.
Anti-Kickback Statute penalties are steeper because the violation is criminal. Since the Bipartisan Budget Act of 2018, each violation can carry:
- A criminal fine of up to $100,000
- Up to 10 years in prison
- Civil monetary penalties of up to $50,000 per kickback, plus three times the amount of the remuneration
- Exclusion from Medicare, Medicaid, and other federal programs
Exclusion is often the most damaging outcome for a practice, because it cuts off the federal payer base most practices depend on.
Stark Law exceptions and Anti-Kickback safe harbors: what practices need to know
Neither law bans normal business. Both include carve-outs for legitimate arrangements, but the carve-outs work differently, and that difference is central to Stark Law compliance.
Stark Law exceptions are mandatory rules. An arrangement is only protected if it fits an exception completely. Common exceptions cover bona fide employment, personal-service arrangements, fair-market-value rental of space or equipment, and in-office ancillary services. Because Stark is strict-liability, missing even one element, such as a lease that lapses or compensation that is not set in advance, can create a violation. CMS updates certain exception limits, including nonmonetary compensation and limited remuneration to a physician, each calendar year, so 2026 figures should be verified before you rely on them.
Anti-Kickback safe harbors are voluntary. An arrangement that fits a safe harbor is protected from prosecution, but an arrangement that does not fit one is not automatically illegal. It is judged on intent. Safe harbors exist for things like personal services and rental agreements, investments in ambulatory surgical centers, and payments to bona fide employees. The safest arrangements are structured, in writing, at fair market value, and not tied to the volume or value of referrals.
Common Stark Law and Anti-Kickback compliance risks for medical practices
The same arrangements come up again and again in enforcement. Watch these closely:
- Compensation tied to referrals. Paying a physician based on the volume or value of the patients they send for labs, imaging, or other DHS is a classic trigger. Structure physician pay carefully. Our overview of physician compensation models walks through fair-market-value approaches.
- Medical directorships and consulting fees. A stipend is fine when the person actually does the work and the pay reflects fair market value. A stipend that is really a reward for referrals is not.
- Space and equipment leases with referral sources. Renting to or from a physician who refers to you needs a written, fair-market-value lease that does not flex with referral volume.
- In-house ancillary services. In-office labs, imaging, and physical therapy are common and often permissible, but they lean directly on Stark’s designated health services rules. Weigh the compliance structure alongside the revenue case for ancillary services.
- Free or discounted items and services. Waived copays, free supplies, or below-cost services offered to referral sources or patients can look like remuneration under the AKS.
None of these is automatically illegal. Each simply needs the right structure and documentation to stay inside an exception or safe harbor.
How do you build a Stark Law compliance program for your practice?
A written compliance program is your best defense, and it overlaps heavily with the HIPAA and OSHA programs your practice already maintains. Practical steps:
- Inventory every financial relationship. List each employment agreement, lease, medical directorship, ownership interest, and vendor arrangement involving a physician or their family.
- Map each one to an exception or safe harbor. For every arrangement, identify which Stark Law exception and, where relevant, which AKS safe harbor it is meant to fit, then confirm it meets every element.
- Put everything in writing at fair market value. Undocumented or off-market deals are the most common findings. Use written agreements with defined terms and independent fair-market-value support.
- Separate compensation from referrals. Make sure no one’s pay varies with the volume or value of their referrals for designated health services.
- Review annually and whenever arrangements change. Leases lapse, stipends get renegotiated, and CMS updates limits each year. Put a yearly review on the calendar.
- Train and document. Make sure physicians and managers understand the basics, and keep records showing the program is active.
This is the same disciplined, documentation-first approach that underpins a strong medical practice compliance program overall, and it pairs naturally with your HIPAA compliance and OSHA compliance work.
When should you bring in help?
If you discover a possible violation, do not ignore it. CMS operates a Self-Referral Disclosure Protocol (SRDP) that lets practices voluntarily disclose actual or potential Stark Law violations, which can reduce the amount owed. Because these laws are fact-specific and the stakes are high, this is one area where practices should work with a qualified healthcare attorney, and often a practice management consultant, before acting.
At Practice Management Consultancy, our compliance consulting helps practices inventory financial relationships, tighten contracts and credentialing, and build the written program that Stark Law compliance depends on, working alongside your legal counsel rather than replacing it. If you are unsure whether an arrangement is structured correctly, contact us to talk it through.
Frequently asked questions
Is the Stark Law the same as the Anti-Kickback Statute?
No. The Stark Law is a civil, strict-liability law that limits physician self-referrals for designated health services under Medicare, while the Anti-Kickback Statute is a criminal law that bans paying or receiving anything of value to induce federal health care referrals. A single arrangement can violate both.
Does the Stark Law apply to commercial insurance or only Medicare?
The Stark Law applies to referrals for designated health services payable by Medicare, and through related provisions, Medicaid. It does not directly govern purely commercial-payer referrals, although the Anti-Kickback Statute and many state laws may still apply.
What are the penalties for an Anti-Kickback Statute violation?
Because it is criminal, each violation can carry a fine of up to $100,000 and up to 10 years in prison, plus civil penalties of up to $50,000 per kickback and three times the remuneration, and exclusion from federal health care programs.
Are in-office labs and imaging allowed under the Stark Law?
Often yes, under the in-office ancillary services exception, but only when the arrangement meets every element of that exception. In-house designated health services are a common compliance risk, so the structure and documentation matter.
How can a medical practice stay compliant with both laws?
Inventory every financial relationship, match each to a Stark Law exception or Anti-Kickback safe harbor, document arrangements in writing at fair market value, keep compensation separate from referrals, and review annually. A written compliance program and outside advisors make it manageable.
Disclaimer: This article is general educational information for medical practices and is not legal advice. The Stark Law and Anti-Kickback Statute are complex and fact-specific, and the penalties are significant. Consult a qualified healthcare attorney or compliance advisor before making decisions about any specific arrangement.
