Stark Law and Anti-Kickback Statute Compliance Guide

Last reviewed May 7, 2026 · By Chad Griffith

The Physician Self-Referral Law (Stark Law, 42 USC 1395nn and 42 CFR Parts 411 Subpart J and 411.350-389) and the Anti-Kickback Statute (AKS, 42 USC 1320a-7b) are the two principal federal fraud and abuse laws regulating financial relationships in healthcare. Stark Law is a strict-liability prohibition on physician referrals to entities with which the physician has a financial relationship for designated health services payable by Medicare. AKS is a criminal statute prohibiting the offer or payment of remuneration to induce referrals of services payable by federal healthcare programs. Violations of either statute can result in civil money penalties, exclusion from federal healthcare programs, and treble damages under the False Claims Act. Compliance requires structuring every physician compensation arrangement, joint venture, and equipment lease to fit a specific exception (Stark) or safe harbor (AKS).

Stark Law Basics

Stark Law applies when: (1) a physician has a financial relationship (ownership/investment or compensation) with an entity; (2) the physician makes a referral to that entity; and (3) the entity furnishes 'designated health services' (DHS) payable by Medicare. The 11 categories of DHS at 42 USC 1395nn(h)(6) include: clinical lab services, physical therapy and occupational therapy services, radiology services, radiation therapy, durable medical equipment and supplies, parenteral and enteral nutrients/equipment/supplies, prosthetics/orthotics, home health services, outpatient prescription drugs, inpatient hospital services, and outpatient hospital services.

Stark is a strict-liability statute — the government does not need to prove intent. If the elements are met and no exception applies, the entity cannot bill Medicare for the DHS referred. Claims submitted in violation of Stark must be returned within 60 days of identification under 42 USC 1320a-7k(d) and may form the basis of False Claims Act liability if not refunded. CMS publishes a Voluntary Self-Referral Disclosure Protocol (SRDP) for resolving Stark violations through self-disclosure with reduced penalty exposure.

Stark Exceptions

Stark provides 30+ exceptions at 42 CFR 411.355 (general exceptions for ownership/investment) and 411.357 (compensation arrangement exceptions). Common exceptions include: (1) Bona fide employment relationships (411.357(c)) — direct employment satisfying defined criteria; (2) Personal service arrangements (411.357(d)) — written contract for specific services with fair market value compensation; (3) Lease of office space (411.357(a)) and lease of equipment (411.357(b)); (4) In-office ancillary services exception (411.355(b)); (5) Physician services exception (411.355(a)); (6) Academic medical centers (411.355(e)); (7) Group practice and member practitioners (411.357(p) for productivity bonuses).

Each exception has detailed requirements that must all be satisfied — partial satisfaction does not qualify the relationship for the exception. The most common compliance failures: missing written agreements (most exceptions require written, signed agreements), compensation not at fair market value, compensation determined in a manner that takes into account volume or value of referrals (prohibited), term shorter than 1 year for certain exceptions, and failure to satisfy the 'commercial reasonableness' standard.

Anti-Kickback Statute (AKS)

AKS at 42 USC 1320a-7b(b) makes it a felony to knowingly and willfully offer, pay, solicit, or receive remuneration to induce or in return for: referring an individual for service or item paid by a federal healthcare program; purchasing, leasing, or ordering any item or service paid by a federal healthcare program. Penalties include: imprisonment up to 10 years, criminal fines up to $100,000 per violation, civil money penalties up to $135,000 per violation under 2026 inflation-adjusted amounts, and exclusion from federal healthcare programs (effectively ending the entity's ability to bill Medicare or Medicaid).

AKS differs from Stark in three key ways: (1) AKS requires intent ('knowingly and willfully'); Stark is strict liability. (2) AKS is broader — applies to any federal healthcare program (Medicare, Medicaid, Tricare, etc.) and any service or item, not just DHS. (3) AKS is criminal as well as civil; Stark is only civil. AKS also extends beyond physicians to include other parties involved in arrangements (manufacturers, suppliers, vendors, marketers).

AKS Safe Harbors

OIG-published safe harbors at 42 CFR 1001.952 provide protection from AKS prosecution for arrangements meeting all the safe harbor's requirements. Common safe harbors: (1) Investment interests (1001.952(a)); (2) Space rental (1001.952(b)); (3) Equipment rental (1001.952(c)); (4) Personal services and management contracts (1001.952(d)); (5) Sale of practice (1001.952(e)); (6) Referral services (1001.952(f)); (7) Warranties (1001.952(g)); (8) Discounts (1001.952(h)); (9) Employees (1001.952(i)); (10) Group purchasing organizations (1001.952(j)); (11) Practitioner recruitment (1001.952(n)); (12) Investment interests in underserved areas (1001.952(r)).

Safe harbor protection is voluntary — failure to meet a safe harbor does not automatically mean the arrangement violates AKS, but the arrangement is then evaluated under the AKS intent test. Many compensation arrangements that don't fit a safe harbor are nonetheless legitimate; arrangements that fit a safe harbor have additional certainty of compliance.

Fair Market Value Documentation

Multiple Stark exceptions and AKS safe harbors require compensation at 'fair market value' (FMV). FMV is defined at 42 CFR 411.351 as 'the value in arm's length transactions, consistent with the general market value of the subject transaction.' Courts and OIG have consistently held that FMV requires documented analysis — opinion alone is insufficient.

FMV documentation typically includes: third-party valuation by a qualified valuator (e.g., MGMA, AAOC, Sullivan Cotter compensation surveys for physician compensation; commercial appraisal for real estate or equipment); benchmarking against market data with explanation of how the proposed compensation aligns with benchmarks; consideration of the specific role, scope, geographic market, and practitioner qualifications; written report retained as part of the arrangement file; and periodic refresh (typically annual or upon contract renewal). FMV opinions become stale — opinions older than 12-24 months are routinely insufficient for new contracts.

OIG Advisory Opinions and CMS Self-Disclosure

The HHS OIG accepts requests for advisory opinions on whether a specific proposed arrangement violates AKS. Advisory opinions are binding on OIG only with respect to the requesting party and the specific facts presented. The opinion process takes 60-100 days and involves submission of facts, OIG analysis, and a written opinion. Advisory opinions are publicly published, providing useful precedent for similar arrangements. The OIG also publishes Special Fraud Alerts and Special Advisory Bulletins highlighting categories of arrangements that raise compliance concerns.

For Stark violations identified after the fact, CMS operates the Voluntary Self-Referral Disclosure Protocol (SRDP). Self-disclosing entities document the nature and duration of the violation, calculate the overpayment, and propose a settlement. CMS has authority to compromise the overpayment under 42 USC 1395nn(g)(1)(B). Self-disclosed Stark violations resolve at substantial discounts to the full repayment amount — typically 5-15% of the overpayment plus interest. Failure to self-disclose and being later identified through audit results in full overpayment plus False Claims Act exposure.

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