What is the Stark law?

Where the name comes from

The law is named after Congressman Pete Stark, who sponsored it. The first version, in 1989, covered only clinical laboratory services; it was expanded in 1993 to the current list of designated health services. It sits in the Social Security Act and is administered by the Centers for Medicare & Medicaid Services (CMS), which has issued detailed regulations and exceptions over the years.

The problem it targets

When a doctor profits from the services they order, there is a risk of ordering more tests, scans and therapy than a patient needs — at the expense of the patient and of federal programs. Rather than try to prove bad motives case by case, Congress banned the arrangement outright unless it fits an exception.

Strict liability, not intent

Stark is violated by the structure of the arrangement, not by a bad motive. If the financial relationship exists and no exception applies, the referral is prohibited and the claim is not payable — whether or not anyone intended to profit improperly. That is what separates it from the Anti-Kickback Statute, which is a criminal law requiring intent, covers anyone who pays for referrals (not just physicians), and reaches all federal health programs.

What counts as a financial relationship

Two kinds: an ownership or investment interest (a share in an imaging center, a lab or a surgery center) and a compensation arrangement (salary, a medical directorship, rent, consulting fees, even free services or gifts above small limits). Relationships of an immediate family member — spouse, parent, child, sibling, in-law and others — count as the doctor's own.

Designated health services

Clinical laboratory services; physical and occupational therapy and outpatient speech-language pathology; radiology and other imaging; radiation therapy; durable medical equipment; parenteral and enteral nutrients; prosthetics and orthotics; home health; outpatient prescription drugs; and inpatient and outpatient hospital services.

How lawful arrangements are built

Through the exceptions — in-office ancillary services, bona fide employment, personal service arrangements, space and equipment rental, fair market value compensation, and others, including value-based arrangements added in 2020. Nearly all of them require the same discipline: a signed written agreement, a term of at least a year, compensation set in advance at fair market value, and payment that does not vary with the volume or value of referrals. Hospitals and group practices typically keep a contract database and review it regularly because an expired lease that nobody renewed is enough to create a violation.

What a violation costs

Denied or refunded payments for every tainted claim, civil monetary penalties, possible exclusion from federal programs, and exposure under the False Claims Act, where damages are trebled and per-claim penalties apply. Many of the largest health care settlements in recent decades have involved Stark and Anti-Kickback allegations, often brought by whistleblowers who share in the recovery.

Finding and fixing a problem

Overpayments must generally be reported and returned within 60 days of being identified. CMS runs a Self-Referral Disclosure Protocol that usually resolves Stark-only problems for far less than the theoretical exposure. Because the choice of route — CMS protocol, the OIG self-disclosure process, or a repayment — affects the outcome, legal advice from a health care lawyer before disclosure is the norm rather than the exception.

Who should care

Physicians who own or invest in any health care business, hospitals and health systems that employ or contract with doctors, labs, imaging centers, DME suppliers and anyone negotiating a medical directorship. Patients are not the targets of the law, but it exists for their protection.

State self-referral laws

Many states have their own versions, sometimes called “mini-Stark” laws, and some reach further than the federal law: they may apply to all payors, including private insurance and cash patients, cover different services, or require disclosure of the doctor's financial interest to the patient. An arrangement that fits a federal exception can still break a state rule, so compliance reviews check both.