Overview
Stark Law, formally the Physician Self-Referral Law codified at 42 USC 1395nn, prohibits physicians from referring Medicare or Medicaid patients for designated health services (DHS) to any entity with which the physician (or an immediate family member) has a financial relationship, unless that relationship satisfies a specific regulatory exception. 'Designated health services' include clinical laboratory services, physical/occupational therapy, radiology and imaging, radiation therapy, DMEPOS, parenteral and enteral nutrition, prosthetics/orthotics, home health services, outpatient prescription drugs, and inpatient/outpatient hospital services — a broad list that covers most of a hospital's service portfolio.
Stark is a strict-liability civil statute — unlike the Anti-Kickback Statute, it does not require intent. If a financial relationship exists, and a prohibited referral occurs, and no exception applies, there is a Stark violation, regardless of whether the parties knew or intended to violate. This makes Stark particularly dangerous for health systems with complex physician contracting arrangements: a single failed exception element on a physician contract can invalidate every referral from that physician during the contract period.
Stark exceptions define the structural parameters within which physician-DHS relationships can exist. Common exceptions include employment (bona fide employment meeting specific requirements), personal services arrangements (written contract, set compensation in advance, fair-market-value remuneration, no compensation tied to referral volume/value), space/equipment rental (fair-market-value rent, written, specified space), and the in-office ancillary services exception (which allows physicians to own and refer for in-office DHS under defined conditions). Exception elements are typically strict and all-or-nothing: meeting 4 of 5 elements does not satisfy the exception.
CMS has made meaningful Stark modernization changes through the 2020 Final Rule — simplifying some exception requirements, clarifying the value-based arrangements pathway, and modernizing the volume-or-value test. These changes reduce some technical compliance burden but do not change Stark's strict-liability character. Periodic exception reviews remain a core compliance program activity for any health system or physician organization with DHS-relevant financial relationships.
Stark violations trigger mandatory repayment of any amounts paid by Medicare or Medicaid for tainted referrals, plus civil monetary penalties, plus potential False Claims Act liability (because billing a Medicare claim from a Stark-tainted referral is a false claim). CMS operates the Stark Self-Referral Disclosure Protocol for voluntary disclosure, which typically reduces the repayment multiplier substantially compared to government-initiated investigation.
Compliance programs treat Stark Law as a recurring audit trigger rather than a one-time policy exercise. The practical approach is a quarterly Stark Law self-audit tied into the broader compliance calendar, with findings tracked against anti kickback statute and false claims act so a Stark Law gap cannot silently persist from one audit cycle to the next. Reviewers on this site pair every Stark Law reference with the corresponding regulatory citation so the policy owner can trace the requirement back to its authoritative source.
Industry benchmark
42 CFR §411.350 et seq. CMS Self-Referral Disclosure Protocol. Major settlements have ranged from low-seven-figure to nine-figure for large health systems with systemic contract compliance issues.
Worked example
A hospital's medical-director agreements with five cardiologists specify hourly compensation but have not been updated since 2019. The current market hourly rate for medical director services has risen; a fair-market-value analysis would now place the rate 30% higher. Without updating the contracts, the hospital faces a technical argument that the compensation is no longer fair market value. Compounding: one contract's annual renewal was never signed. The hospital convenes legal counsel, restructures the contracts, and self-discloses through SRDP to resolve the potential exposure.
Frequently asked questions — Stark Law
How is Stark different from the Anti-Kickback Statute?
Stark is strict-liability civil — no intent required, applies to physician referrals for designated health services, federal healthcare program only. AKS is criminal with intent requirement, applies to any referral source and any federal healthcare program referral. A single arrangement frequently violates both.
What are designated health services?
The DHS list includes clinical lab, physical/occupational therapy, imaging and radiology, radiation therapy, DMEPOS, parenteral/enteral nutrition, orthotics/prosthetics, home health, outpatient prescription drugs, and inpatient/outpatient hospital services. This covers most of a hospital's service portfolio.
Do all physician contracts have to meet a Stark exception?
Every physician financial relationship that could result in referrals for DHS must fit within an exception. Employment, personal services, space rental, and in-office ancillary services are common exceptions. Contracts that don't fit an exception create Stark exposure for every referred DHS claim.
Can Stark violations be resolved through self-disclosure?
Yes. CMS operates the Stark Self-Referral Disclosure Protocol (SRDP) for voluntary disclosure of Stark violations. SRDP typically reduces the repayment multiplier and avoids False Claims Act escalation. It is the standard remediation path for identified systemic Stark issues.
Disclaimer
This glossary entry is operational reference for revenue-cycle and medical-billing professionals. It is not legal, clinical, or contractual advice. Industry benchmarks cite named public sources where available; always verify against the current guidance from the authority body before relying on a number in a contract, policy, or compliance filing.