Stark Law and Anti-Kickback Pitfalls in Ancillary Service Arrangements

Ancillary services — imaging, laboratory work, physical therapy, durable medical equipment, infusion, pathology — are often the most profitable lines in a medical practice or hospital system. They're also where compliance risk concentrates most heavily. The Stark Law (Physician Self-Referral Law) and the federal Anti-Kickback Statute (AKS) were written with exactly these arrangements in mind, and enforcement agencies have shown no hesitation about pursuing organizations that get the structure wrong — even when everyone involved believed they were acting in good faith.

For hospital administrators and physician groups building or expanding ancillary service lines, understanding where these two statutes diverge — and where they overlap — is the difference between a compliant revenue stream and a False Claims Act exposure sitting quietly on the books until an audit, a departing employee, or a whistleblower brings it to light.

Two Statutes, Two Different Tests

Stark Law is a strict liability statute. Intent doesn't matter. If a physician has a financial relationship with an entity and refers Medicare or Medicaid patients to that entity for a designated health service without fitting squarely within an exception, the resulting claim is not payable — full stop, regardless of motive or good faith.

The Anti-Kickback Statute is different. It's a criminal statute requiring intent: knowingly and willfully offering, paying, soliciting, or receiving remuneration to induce referrals. Because AKS covers any federal healthcare program — not just designated health services — its reach is broader in some ways and narrower in others. A single arrangement can trigger both statutes simultaneously, and organizations that evaluate only one are frequently blindsided by exposure under the other.

A Common Fact Pattern

Consider a mid-size orthopedic group that decides to open an in-house imaging suite. Three physician-owners fund the buildout personally and lease space in the same building to the practice at a rate their real estate broker says is "market." The group's productivity bonus formula, unchanged for years, allocates a percentage of ancillary revenue to each physician based on referrals they personally generated.

On paper, nothing looks unusual — this is one of the most common ways ancillary lines get built. But look closer:

• The lease rate was benchmarked against general office space, not space built out for imaging equipment with the specific terms of this deal — a fair market value gap that's easy to create and easy to miss.
• The productivity formula ties compensation directly to each physician's own referral volume into a service they own, which is precisely the kind of volume-based compensation Stark's in-office ancillary services exception is designed to guard against unless every element of the exception — supervision, location, billing — is independently satisfied.
• No one revisited the commercial reasonableness question: would this arrangement make business sense if the physician-owners weren't the ones referring into it?

None of this required bad intent. It required treating fair market value and commercial reasonableness as one-time checkboxes rather than ongoing standards — which is exactly how compliant arrangements drift into non-compliant ones over time.

Where Ancillary Arrangements Go Wrong

1. Fair market value that isn't actually fair market value.
Space and equipment leases, medical director agreements, and per-click arrangements for ancillary equipment are common flashpoints. A lease rate pegged to referral volume, or a medical director stipend that doesn't correspond to actual time and services rendered, is a red flag under both statutes. A valuation opinion is only as good as the specific terms it actually evaluated.

2. Commercial reasonableness gets treated as a formality.
An arrangement can be paid at fair market value and still fail if it wouldn't make commercial sense absent the referral relationship. Enforcement agencies and qui tam relators increasingly focus here — does the ancillary arrangement serve a legitimate business purpose independent of who refers to whom?

3. Physician-owned ancillary entities without a clean exception.
The in-office ancillary services exception is one of the most commonly relied-upon Stark exceptions — and one of the most commonly misapplied. Supervision requirements, location requirements, and billing requirements each carry specific conditions that must all be satisfied, not just generally approximated.

4. Volume- or value-based compensation creeping into productivity formulas.
Physician compensation tied to ancillary referral volume — even indirectly, through a formula that rewards ordering patterns rather than personally performed services — is one of the fastest ways to convert a routine productivity bonus into a Stark violation.

5. Assuming a safe harbor applies without confirming every element.
AKS safe harbors are not general permissions — they're narrow, all-or-nothing protections. Missing one element (a required minimum lease term, a specific aggregate compensation-setting method, a required signature) can take an arrangement outside the safe harbor entirely, even if the arrangement is otherwise reasonable in substance.

Enforcement Trends Worth Watching

Ancillary service arrangements have remained a consistent enforcement priority for the Department of Justice and the HHS Office of Inspector General, particularly where compensation structures reward referral volume rather than personally performed services. Many of the largest healthcare False Claims Act recoveries in recent years have originated from whistleblower complaints filed by former employees or business partners with direct knowledge of how compensation was actually calculated — not from routine audits. That should inform how organizations think about risk: the exposure often isn't discovered from the outside in, but from the inside out.

Before Launching or Renewing an Ancillary Arrangement

• Document the business rationale for the arrangement independent of referral patterns, before compensation terms are finalized
• Obtain a fair market value opinion that specifically addresses the actual terms of the arrangement — not a generic market survey
• Map the arrangement against both Stark exceptions and AKS safe harbors separately; satisfying one does not satisfy the other
• Review compensation formulas for any variable that correlates, directly or indirectly, with referral volume or value
• Revisit existing arrangements periodically — an arrangement compliant at inception can drift out of compliance as referral patterns, volume, or terms change

If a Problem Is Already Identified

Organizations that discover a potential Stark or AKS issue in an existing arrangement have options short of waiting for an audit. The CMS Voluntary Self-Referral Disclosure Protocol allows providers to self-report Stark Law violations, often resulting in a reduced settlement compared to what a government-initiated investigation would yield. Similarly, the OIG Self-Disclosure Protocol provides a structured path for reporting potential AKS violations. Both processes require careful legal analysis before disclosure — an incomplete or poorly framed self-disclosure can create more exposure than it resolves — but in nearly every case, proactive correction costs less than being found first.

The Bottom Line

Stark Law violations can render claims non-payable and expose an organization to False Claims Act liability, which carries treble damages and substantial per-claim penalties. AKS violations carry potential criminal liability, exclusion from federal healthcare programs, and civil monetary penalties. Ancillary service lines aren't going away, and the regulatory scrutiny on them isn't loosening. Practices and hospital systems that build these arrangements with fair market value, commercial reasonableness, and referral-independence in mind from the outset avoid having to unwind — or defend — a structure after the fact.

Facing an ancillary services compliance question?

If your practice, ASC, or hospital system is structuring, renewing, or facing an audit related to an ancillary service arrangement, a compliance review before signing — not after a subpoena arrives — is the difference between a clean deal and a costly one.

Florida Healthcare Law Firm — Regulatory Compliance Team
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