3.2 Anti-Kickback Statute (AKS) & Stark Law

Two Laws, One Goal

The Anti-Kickback Statute (AKS) and the Physician Self-Referral Law (Stark Law) both target the danger that money — not medical need — drives referrals. The CPB exam frequently presents a scenario and asks which law applies, so the distinctions matter more than the overlap. The trick is that one fact pattern can trigger both, but only one usually fits most completely.

Anti-Kickback Statute (AKS)

The AKS, at 42 U.S.C. 1320a-7b(b), is a criminal statute. It prohibits knowingly and willfully offering, paying, soliciting, or receiving remuneration (anything of value — cash, free rent, waived copays, gifts) to induce or reward referrals of items or services payable by a federal health care program.

Key points:

• Intent-based — the government must show the parties acted knowingly and willfully.
• Broad reach — it applies to any referral source (physicians, marketers, pharmacies, DME suppliers) and any item or service.
• Both sides liable — the payer and the recipient of remuneration can be charged.
• Safe harbors — regulations describe voluntary safe harbors (e.g., certain space/equipment leases, bona fide employment, personal-services arrangements). Meeting every element of a safe harbor protects the arrangement; failing one simply means it is judged on its facts, not automatically illegal.
• A claim resulting from an AKS violation is per se false under the FCA.

Stark Law (Physician Self-Referral)

Stark, at 42 U.S.C. 1395nn, is a civil, strict-liability statute. It prohibits a physician from referring a Medicare patient for a designated health service (DHS) to an entity with which the physician — or an immediate family member — has a financial relationship, unless an exception applies.

Key points:

• Strict liability — intent is irrelevant. If a referral violates Stark and no exception applies, the violation exists regardless of motive.
• Designated health services include clinical lab tests, imaging (MRI/CT/ultrasound), physical/occupational therapy, durable medical equipment (DME), home health, parenteral/enteral nutrients, prosthetics, radiation therapy, and outpatient prescription drugs.
• Exceptions are mandatory — an arrangement must fit fully within a Stark exception (e.g., bona fide employment, in-office ancillary services) to be lawful.
• A claim for a service furnished under a prohibited referral may not be billed or paid.

AKS vs. Stark Side-by-Side

Penalties and the FCA Link

Beyond criminal exposure, the government may impose civil monetary penalties (CMPs) plus assessments tied to the improper remuneration, and may exclude violators from Medicare and Medicaid. Because CMP dollar amounts are inflation-adjusted, exam answers should describe the type of penalty rather than a fixed figure. The most testable connection: any claim arising from an AKS or Stark violation becomes a false claim, so a single kickback arrangement can cascade into FCA treble damages.

How to Tell the Two Apart on the Exam

Use this decision sequence when a scenario appears:

1. Is the referrer a physician (or immediate family) sending a Medicare patient for a DHS to an entity they have a financial tie with? If yes, think Stark first — and remember intent is irrelevant.
2. Is someone paying or receiving anything of value to induce referrals? If the fact pattern stresses a payment, gift, free service, or waived fee meant to reward referrals, think AKS — and look for knowing-and-willful intent language.
3. Is the referral source a non-physician (a marketer, a lab, a DME company, a pharmacy)? Stark cannot apply, so it must be AKS.

Watch the keyword cues. Stark scenarios describe ownership, investment, or compensation relationships. AKS scenarios describe inducements — "per-patient fee," "in exchange for sending patients," "thank-you payment."

Voluntary Disclosure Paths

Both statutes have a disclosure outlet. Stark violations are reported through the CMS Self-Referral Disclosure Protocol (SRDP), which can dramatically reduce the refund owed. AKS and broader fraud go through the OIG Self-Disclosure Protocol (SDP) covered later in this chapter. The advisory-opinion process also lets a provider ask the OIG, in advance, whether a specific arrangement risks AKS sanctions — a protection unique to AKS.

A Worked Example

A hospital leases office space to a referring cardiologist at below fair-market value and the lease term is month-to-month with no written agreement. Even with no proven bad intent, this likely fails the Stark rental of office space exception (which requires a written, signed, fair-market-value lease of at least one year). Because cardiac imaging and lab work are DHS, every referral the cardiologist makes during the noncompliant lease may be a prohibited referral whose claims cannot be billed — and if the below-market rent was intended to reward referrals, AKS and the FCA also attach.

One sloppy lease can implicate all three statutes at once.