The Stark Law flatly prohibits a physician from referring Medicare patients for certain services to any entity in which the physician or an immediate family member holds a financial interest, so the Stark Law exceptions are the mechanism Congress built to let legitimate business relationships continue without triggering that prohibition. Each exception is a defined safe harbor with its own conditions, and the arrangement either meets every element or it doesn’t; there is no partial credit. The law is strict liability, meaning the government never has to prove you meant to break it.1Office of the Law Revision Counsel. 42 USC 1395nn – Limitation on Certain Physician Referrals Two ideas run through nearly every exception: the money must reflect fair market value, and it cannot vary with the volume or value of referrals.
When You Actually Need an Exception
The Stark Law only reaches referrals for a defined list of “designated health services” (DHS): clinical lab work, physical and occupational therapy and speech-language pathology, radiology and imaging, radiation therapy, durable medical equipment, parenteral and enteral nutrition, prosthetics and orthotics, home health, outpatient prescription drugs, and inpatient and outpatient hospital services.2Office of the Law Revision Counsel. 42 USC 1395nn – Limitation on Certain Physician Referrals If the service falls outside that list, no exception is needed. The prohibition also reaches financial interests held by immediate family: spouses, parents, children, siblings, in-laws, stepfamily, grandparents, and grandchildren. A brother-in-law’s stake in the lab counts the same as your own.
The Two Tests Every Exception Uses
Fair market value means the price unrelated parties would agree to at arm’s length, calculated without any consideration of the referrals passing between them.3eCFR. 42 CFR 411.351 – Definitions Paying a physician above market is a problem. So is giving them a below-market lease. Independent appraisals and national compensation surveys are the standard documentation.
The volume-or-value standard prohibits any compensation formula that moves with the number of referrals or the revenue those referrals produce. Productivity bonuses for services the physician personally performs are fine; payments that function as a proxy for referred business are not. More exceptions fail on this element than on any other.
Writing, Signatures, and the 90-Day Cure
Most Stark exceptions require a written, signed arrangement. A 2020 CMS final rule confirmed that a collection of contemporaneous documents—emails, term sheets, amendments—can satisfy the writing requirement collectively, so a single master contract isn’t mandatory.4Federal Register. Medicare Program – Modernizing and Clarifying the Physician Self-Referral Regulations The same rule gave parties 90 consecutive calendar days to cure a missing writing or signature when every other element of an exception is already met. Electronic signatures valid under federal or state law count.
Compensation-Based Exceptions
Bona Fide Employment
The employment exception at 42 C.F.R. § 411.357(c) covers traditional W-2 relationships.5eCFR. 42 CFR 411.357 – Exceptions to the Referral Prohibition Related to Compensation Arrangements The physician must perform identifiable services for a legitimate business purpose, pay must be consistent with fair market value, and productivity bonuses are permitted only for services the physician personally performs. The arrangement also must be commercially reasonable: the position would exist and be worth funding even if the physician referred no patients at all.
Personal Service Arrangements
Independent-contractor relationships live under 42 C.F.R. § 411.357(d). The agreement must be written, signed, and specify every service. It must run at least one year, and compensation must be set in advance at fair market value with no referral-based component. Bundled contracts that cover medical direction, on-call coverage, and committee work need enough detail that hours can be matched to tasks; facilities that cannot show the physician actually did the contracted work are exposed if the arrangement is later reviewed.
Non-Monetary Compensation
Meals, event tickets, and small gifts are protected under 42 C.F.R. § 411.357(k) up to an annual cap that CMS adjusts each year. For 2026 the limit is $535 per physician.6Centers for Medicare & Medicaid Services. CPI-U Updates Exceed the cap by a dollar and the exception fails for that physician for the rest of the calendar year, which is why compliance programs track every lunch and holiday gift across the medical staff.
Isolated Transactions
One-time events like the sale of a practice or a lump-sum settlement of a genuine dispute qualify under 42 C.F.R. § 411.357(f). The payment must reflect fair market value, be untied to referrals, and be commercially reasonable on its own. The condition most people miss: for six months after the transaction, the parties cannot enter into additional transactions unless separately protected by another exception or covered by commercially reasonable post-closing adjustments. A January practice sale followed by a March consulting agreement retroactively breaks the exception.
Rental of Office Space and Equipment
Space leases fall under 42 C.F.R. § 411.357(a) and equipment leases under § 411.357(b). The lease must be written, signed, and run at least one year. The space or equipment cannot exceed what is reasonably necessary, and for office space, the physician must have exclusive use during scheduled times. Rent must reflect fair market value. Charging $20 per square foot in a $35 market is as problematic as charging $50; what matters is that price drifts from market in a way that correlates with referrals. Rent formulas that fluctuate with patient volume fail.
Leases don’t always renew on time. A lease that continues on the same terms and conditions immediately after the initial one-year term qualifies as a holdover as long as every original condition still applies. Change the price during holdover and it is no longer a holdover; it is a new deal that needs a fresh one-year written agreement.
Physician Recruitment
Hospitals can offer income guarantees, signing bonuses, and relocation assistance under 42 C.F.R. § 411.357(e) to bring physicians into their service area. The physician must actually relocate, defined as moving the practice at least 25 miles into the service area, or moving into the service area and drawing at least 75 percent of revenue from patients not seen at the prior location during the preceding three years. The arrangement must be in writing, and the money cannot be conditioned on the physician sending referrals back to the hospital. When the recruited physician joins an existing group, pass-through rules block the group from keeping the money or funneling it to existing partners.
Ownership and Investment Exceptions
Ownership interests are governed by 42 U.S.C. § 1395nn(c) and (d) and by 42 C.F.R. § 411.356.7eCFR. 42 CFR 411.356 – Exceptions to the Referral Prohibition Related to Ownership or Investment Interests The available pathways depend on the entity and the type of interest.
Publicly Traded Securities
A physician may own shares in a corporation whose stockholder equity exceeded $75 million at the end of its most recent fiscal year, or averaged above that threshold over the previous three fiscal years. Stockholder equity is total assets minus total liabilities. Holding stock in a large publicly traded healthcare company is treated differently from a direct stake in the local imaging center a physician sends patients to.
Whole Hospital Ownership
A physician with hospital privileges may own an interest in the entire hospital (not a subdivision) and refer patients there. The Affordable Care Act narrowed this exception significantly starting in 2010: only hospitals that already had physician ownership and a Medicare provider agreement as of December 31, 2010 can qualify. Those hospitals cannot expand operating rooms, procedure rooms, or beds beyond the counts that existed on March 23, 2010, and they must disclose physician ownership to patients and the public. New physician-owned hospitals are effectively frozen out. Legislation has been introduced to repeal these limits, but as of 2026 the moratorium stands.
Rural Provider Ownership
Physician ownership is treated more leniently when the entity sits outside a metropolitan statistical area and furnishes at least 75 percent of its designated health services to rural residents. Rural communities often depend on local physician investment to keep facilities operating at all, and the exception reflects that reality.
In-Office Ancillary Services
Group practices can refer patients for designated health services performed within their own offices under the in-office ancillary services exception. This is how a physician’s office provides labs, X-rays, or physical therapy on-site during a visit. The services must be furnished in the same building where the referring physician or another group member sees patients, and the group must bill under its own number.
The practice also has to qualify as a “group practice” under 42 C.F.R. § 411.352, which is more than shared office space.8eCFR. 42 CFR 411.352 – Group Practice It must operate as a single legal entity. At least 75 percent of the patient care services provided by group members must be furnished through the group and billed under the group’s number. There must be centralized decision-making over budgets, compensation, and assets, with consolidated billing and reporting. Members must personally conduct at least 75 percent of the group’s physician-patient encounters. Loose affiliations formed mainly to share referral profits do not qualify.
Value-Based Arrangements
The regulations at 42 C.F.R. § 411.357(aa) created exceptions for coordinated-care models in which physicians and hospitals share responsibility for outcomes and cost. Protection comes in three tiers, calibrated to how much financial risk the participants take on. Full financial risk arrangements—where the value-based enterprise is responsible for the total cost of a defined patient population’s care—get the most flexibility in structuring internal payments. The middle tier covers arrangements with meaningful downside risk, where providers absorb losses when they miss quality or cost targets. The narrowest tier protects arrangements with no financial risk, provided the compensation is reasonably designed to improve coordination, quality, or efficiency. The focus across all three moves away from policing individual transaction prices and toward whether the arrangement genuinely aims at better outcomes.
Cybersecurity Technology and Services
A newer exception at 42 C.F.R. § 411.357(bb) lets hospitals and other entities provide cybersecurity software, hardware, and related services to physicians. The technology must be necessary and used predominantly to implement, maintain, or restore cybersecurity protections. There is no requirement that the physician pay a share of the cost. Eligibility and the amount provided cannot depend on referral volume, the physician cannot make receiving the technology a condition of doing business with the donor, and the arrangement must be documented in writing. Weak cybersecurity at a physician’s office creates risk for every entity connected to it electronically, and the exception is built around that reality.
What Happens if an Exception Fails
Because the Stark Law is strict liability, missing any element of an exception turns every claim tied to the referral into a violation. Medicare will not pay for designated health services furnished under a prohibited referral, and any payments already made must be refunded.1Office of the Law Revision Counsel. 42 USC 1395nn – Limitation on Certain Physician Referrals Federal law requires identified overpayments to be reported and returned within 60 days.
Civil monetary penalties for claims tied to prohibited referrals reach $31,670 per violation in 2026. For schemes designed to circumvent the law—arrangements structured to look compliant while defeating the statute’s purpose—the penalty jumps to $211,146 per arrangement.9Federal Register. Annual Civil Monetary Penalties Inflation Adjustment Claims resulting from a Stark violation can also be pursued as false claims, with damages of up to three times the government’s loss plus per-claim penalties.10Office of the Law Revision Counsel. 31 USC 3729 – False Claims Exclusion from federal healthcare programs is also on the table, which for most practices ends the business.11Office of Inspector General. Fraud and Abuse Laws
Fixing a Problem You Find Yourself
If you identify a potential Stark violation in your own arrangements, CMS runs a formal Self-Referral Disclosure Protocol (SRDP) that lets providers and suppliers disclose actual or potential violations and resolve overpayment liability.12Centers for Medicare & Medicaid Services. Self-Referral Disclosure Protocol Submissions require the current OMB-approved disclosure form, physician or group practice information forms depending on the type of noncompliance, a financial analysis worksheet calculating the overpayment, and an acceptable certification. Reviews often take years, but self-disclosure typically produces smaller settlements than an OIG investigation would.
The 60-day overpayment clock runs regardless of whether an SRDP submission is pending. Many compliance teams file an SRDP disclosure while placing identified overpayments in reserve, demonstrating good faith and limiting exposure under the separate overpayment reporting rules.