United States - Arizona - AI Claim Denial Restrictions (HB 2175)

Overview

Arizona House Bill 2175 establishes groundbreaking healthcare AI restrictions, making Arizona among the first US states to prohibit health insurers from using artificial intelligence as the final decision-maker for medical claim denials. Signed by Governor Katie Hobbs on May 12, 2025, the legislation responds to documented concerns about insurers deploying AI and algorithmic tools to automate coverage determinations without physician oversight. The law does not explicitly reference AI but achieves its regulatory objective by requiring that all prior authorization denials based on medical necessity be reviewed and signed by a licensed Arizona medical director. This human-in-the-loop requirement effectively prevents AI systems from making final denial decisions, ensuring that medical professionals accountable to Arizona standards oversee consequential healthcare coverage determinations. The bill's unanimous House passage (58-0) reflects bipartisan consensus on protecting patient care from automation. Sponsored by Representative Julie Willoughby (R-District 13), the law takes effect July 1, 2026, providing a transition period for insurers to adapt their claims processing systems. The Arizona Medical Association championed the legislation as essential to 'keeping healthcare human.'

Definitions

HB 2175 operates through healthcare insurance terminology rather than AI-specific definitions. Medical director must hold an active, unrestricted license to practice medicine in Arizona—this Arizona licensure requirement ensures accountability to state medical standards. Prior authorization refers to insurer approval required before certain medical services, procedures, or treatments are covered. Medical necessity is the standard applied to determine whether healthcare services are appropriate and required for a patient's condition—denials based on medical necessity trigger the law's requirements. The law does not define artificial intelligence or algorithm explicitly; instead, it achieves AI restriction through the human review mandate. Health care insurer encompasses entities subject to Arizona insurance regulation that provide health coverage requiring prior authorization. Written denial must include explanation of denial reasons and the medical director's signature.

Governance and Institutional Framework

HB 2175 operates within Arizona's existing health insurance regulatory framework. The Arizona Department of Insurance and Financial Institutions oversees health insurer compliance with state insurance laws, including the new requirements. The law does not create new regulatory bodies or AI-specific oversight mechanisms—compliance occurs through standard insurance regulation. Licensed medical directors bear direct responsibility for reviewing and signing denials; their Arizona medical licenses subject them to Arizona Medical Board oversight for professional conduct. Health insurers must adjust their claims processing systems to incorporate medical director review before issuing medical necessity denials. The law creates accountability through professional licensing: medical directors who sign denials they did not actually review could face professional misconduct charges. Patient appeals of denied claims follow existing insurance appeal procedures. No specific reporting requirements to state agencies are established beyond standard insurance regulatory obligations.

Key Focus Areas

• Human Review Mandate: Medical directors must individually review denials involving medical necessity before insurers may deny claims.
• Arizona Licensure Requirement: The reviewing medical director must hold an active, unrestricted Arizona medical license.
• Written Denial Requirement: All prior authorization denials based on medical necessity must be issued in writing.
• Explanation Requirement: Written denials must include explanation of why the treatment was denied.
• Signature Requirement: The medical director who made the denial must personally sign the written denial.
• AI Restriction Effect: By requiring human physician review, the law prevents AI from serving as final decision-maker on medical necessity denials.
• Physician Accountability: Arizona-licensed medical directors are accountable to state medical standards.
• Patient Protection: Ensures consequential healthcare coverage decisions receive physician oversight.

Implementation Framework

HB 2175 takes effect July 1, 2026, providing approximately 14 months from signing for insurers to implement compliance measures. Health insurers must redesign claims processing workflows to route all medical necessity denials through licensed Arizona medical directors. This may require hiring additional medical directors, implementing case management systems to facilitate review, and creating documentation processes for signatures and explanations. Insurers currently using AI or algorithmic tools for initial claim screening may continue doing so, but cannot rely on these tools for final denial decisions—a licensed medical director must review and approve each denial. Training programs should ensure medical directors understand their review obligations and the documentation requirements. Insurers should document their compliance processes to demonstrate regulatory adherence. The transition period allows insurers with large claim volumes to scale medical director capacity appropriately.

Monitoring and Evaluation

HB 2175 relies on existing insurance regulatory mechanisms for compliance monitoring. The Arizona Department of Insurance and Financial Institutions may examine insurer claims practices during routine examinations or in response to complaints. Patient complaints about denial processes provide a monitoring mechanism—allegations that denials lack required medical director review could trigger regulatory inquiry. The Arizona Medical Board may receive complaints about medical directors signing denials without proper review. Insurer appeals data may reveal patterns in denial practices. The law does not establish specific reporting requirements or evaluation metrics. Industry groups and consumer advocates may track implementation and identify compliance concerns. The Arizona Medical Association, having championed the legislation, may monitor its effectiveness in protecting patient care. Legislative oversight through committee hearings may assess implementation progress.

Penalties, Liability, and Appeals

HB 2175 does not establish specific penalties; enforcement occurs through existing regulatory and professional frameworks. Insurance regulatory penalties: Insurers issuing denials without required medical director review may face enforcement action from the Department of Insurance, potentially including fines and corrective action requirements. Professional discipline: Medical directors who sign denials they did not actually review could face Arizona Medical Board action for unprofessional conduct, including potential license sanctions. Civil liability: Patients harmed by improperly denied coverage may have grounds for civil claims against insurers. Existing appeal rights: Patients retain existing rights to appeal denied claims through internal insurer processes and external review mechanisms. Bad faith claims: Systematic failure to comply could support bad faith insurance claims. The law does not create a specific private right of action for violations of its requirements.

Relationship to Other Instruments

HB 2175 represents an emerging category of state healthcare AI regulation distinct from comprehensive AI governance laws like Colorado SB24-205 or Texas TRAIGA. The law joins sector-specific AI restrictions being enacted across states. Texas SB 1188, signed concurrently with TRAIGA, similarly addresses healthcare AI by requiring licensed practitioners to review AI-generated diagnostic records. California has considered legislation addressing AI in insurance claims. At the federal level, the Centers for Medicare & Medicaid Services (CMS) has issued guidance on AI use in Medicare Advantage prior authorization, creating potential federal-state coordination. Existing Arizona insurance law provides the regulatory foundation upon which HB 2175 builds. The Arizona Medical Practice Act establishes the licensing framework referenced in the law. HIPAA and other federal healthcare regulations continue to apply to insurer data practices.

International Alignment

HB 2175 reflects emerging international concern about AI automation in healthcare decisions. The EU AI Act classifies AI systems affecting health insurance coverage as high-risk, requiring human oversight and transparency—Arizona's approach achieves similar objectives through sector-specific regulation. The World Health Organization has called for human oversight of AI in healthcare settings. Canadian provinces are examining AI use in health insurance administration. The human-in-the-loop requirement aligns with international medical ethics principles emphasizing physician responsibility for clinical decisions. OECD AI Principles support human accountability for consequential AI applications. The focus on medical director licensing creates Arizona-specific accountability that may differ from other jurisdictions' approaches to healthcare AI oversight.

Implementation Timeline

Date	Milestone
January 28, 2025	HB 2175 introduced by Rep. Julie Willoughby
February 20, 2025	House passage (58-0)
April 29, 2025	Senate passage
May 12, 2025	Governor Katie Hobbs signs HB 2175
July 1, 2026	Law takes effect; compliance required

Compliance Checklist

Requirement	Details
Identify Medical Necessity Denials	Determine which prior authorization denials involve medical necessity determinations
Ensure Medical Director Capacity	Verify sufficient Arizona-licensed medical directors to review all medical necessity denials
Implement Review Workflow	Create claims processing systems routing medical necessity denials to medical directors before issuance
Develop Written Denial Format	Create denial templates including explanation and signature fields
Verify Arizona Licensure	Confirm medical directors hold active, unrestricted Arizona medical licenses
Train Medical Directors	Ensure medical directors understand review obligations and documentation requirements
Document Compliance Processes	Maintain records demonstrating medical director review of denials
Update AI/Algorithm Use	Ensure AI tools support but do not replace medical director final review
Review Appeals Procedures	Confirm patient appeal rights are clearly communicated with denials

Sources and References

Source	Type
HB 2175 Bill Text - Arizona Legislature	Primary Source
HB 2175 Bill Summary	Primary Source
Arizona Medical Association	Industry Source
Arizona Dept. of Insurance	Regulatory Authority