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What is the Stark law?

Practice area: Health Care Law · Reviewed 2026-09-22

The Stark law is the US physician self-referral law. It bars a doctor from referring Medicare or Medicaid patients for certain designated health services to an entity the doctor — or an immediate family member — has a financial relationship with, unless the arrangement fits a written exception.

Strict liability, not intent

Stark is violated by the structure of the arrangement, not by a bad motive. If the 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 and which reaches all payors, not just federal programmes.

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, and others. 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.

What a violation costs

Denied or refunded payments, civil monetary penalties, and exposure under the False Claims Act, where damages are trebled and per-claim penalties apply. Self-disclosure through the CMS protocol is the usual route once a problem is found, and legal advice before disclosure is the norm rather than the exception.

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This page explains general rules in the United States and is not legal advice. Deadlines and definitions differ by state, and only a licensed attorney can tell you how the law applies to your own situation.