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SB-503 • 2026

Health care services: artificial intelligence.

Health care services: artificial intelligence.

Healthcare Labor Technology
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Weber Pierson
Last action
2025-09-10
Official status
Ordered to inactive file on request of Assembly Member Aguiar-Curry.
Effective date
Not listed

Plain English Breakdown

The candidate explanation includes some speculative elements that are not supported by the official source material, such as specific dates and details about penalties.

Health Care Services: Artificial Intelligence

This law requires developers and users of artificial intelligence in healthcare to identify and mitigate any biases that could affect patient care or resource allocation, with regular audits starting from January 1, 2030.

What This Bill Does

  • Requires developers and deployers of AI systems used for clinical decision-making or health care resource allocation to make reasonable efforts to identify and mitigate biased impacts in the system’s outputs.
  • Requires deployers to regularly monitor these AI systems and take steps to reduce any bias that may occur.
  • Starting from January 1, 2030, developers must submit their AI systems to an independent auditor annually for compliance checks.
  • Developers are required to share audit summaries on their websites for public access.
  • Deployers must provide annual reports to the health department about their efforts to comply with identification and mitigation requirements.

Who It Names or Affects

  • Developers of artificial intelligence used in healthcare decision-making or resource allocation
  • Deployers (users) of such AI systems, including hospitals and clinics

Terms To Know

Generative Artificial Intelligence
AI that creates new content like text or images based on what it has learned from existing data.
Deployers
People or organizations who use AI systems in their work, such as hospitals using AI for patient care.

Limits and Unknowns

  • The bill does not specify how the health department will enforce these rules.
  • It is unclear what happens if a developer fails to comply with the requirements set by this law.
  • There are no details on penalties or consequences for non-compliance.

Bill History

  1. 2025-09-10 California Legislative Information

    Ordered to inactive file on request of Assembly Member Aguiar-Curry.

  2. 2025-09-04 California Legislative Information

    Ordered to third reading.

  3. 2025-09-04 California Legislative Information

    Read third time and amended.

  4. 2025-09-02 California Legislative Information

    Read second time. Ordered to third reading.

  5. 2025-08-29 California Legislative Information

    From committee: Do pass. (Ayes 15. Noes 0.) (August 29).

  6. 2025-08-20 California Legislative Information

    August 20 set for first hearing. Placed on APPR. suspense file.

  7. 2025-07-17 California Legislative Information

    Read second time and amended. Re-referred to Com. on APPR.

  8. 2025-07-17 California Legislative Information

    From committee: Do pass as amended and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (July 16).

  9. 2025-07-17 California Legislative Information

    Assembly Rule 63 suspended. (Ayes 49. Noes 15. Page 2578.)

  10. 2025-07-10 California Legislative Information

    Read second time and amended. Re-referred to Com. on P. & C.P.

  11. 2025-07-09 California Legislative Information

    From committee: Do pass as amended and re-refer to Com. on P. & C.P. (Ayes 16. Noes 0.) (July 8).

  12. 2025-06-30 California Legislative Information

    From committee with author's amendments. Read second time and amended. Re-referred to Com. on HEALTH.

  13. 2025-06-24 California Legislative Information

    July 1 hearing postponed by committee.

  14. 2025-06-05 California Legislative Information

    Referred to Coms. on HEALTH and P. & C.P.

  15. 2025-05-29 California Legislative Information

    In Assembly. Read first time. Held at Desk.

  16. 2025-05-29 California Legislative Information

    Read third time. Passed. (Ayes 38. Noes 0. Page 1327.) Ordered to the Assembly.

  17. 2025-05-27 California Legislative Information

    Ordered to special consent calendar.

  18. 2025-05-23 California Legislative Information

    Read second time. Ordered to third reading.

  19. 2025-05-23 California Legislative Information

    From committee: Do pass. (Ayes 6. Noes 0. Page 1202.) (May 23).

  20. 2025-05-16 California Legislative Information

    Set for hearing May 23.

  21. 2025-05-12 California Legislative Information

    May 12 hearing: Placed on APPR. suspense file.

  22. 2025-05-02 California Legislative Information

    Set for hearing May 12.

  23. 2025-04-30 California Legislative Information

    From committee: Do pass and re-refer to Com. on APPR. (Ayes 13. Noes 0. Page 941.) (April 29). Re-referred to Com. on APPR.

  24. 2025-04-23 California Legislative Information

    Re-referred to Com. on JUD.

  25. 2025-04-22 California Legislative Information

    Set for hearing April 29 in JUD. pending receipt.

  26. 2025-04-10 California Legislative Information

    Re-referred to Com. on RLS.

  27. 2025-04-10 California Legislative Information

    Withdrawn from committee.

  28. 2025-04-10 California Legislative Information

    Read second time and amended. Re-referred to Com. on G.O.

  29. 2025-04-10 California Legislative Information

    From committee: Do pass as amended and re-refer to Com. on G.O. (Ayes 10. Noes 0. Page 737.) (April 9).

  30. 2025-04-02 California Legislative Information

    Set for hearing April 9.

  31. 2025-04-02 California Legislative Information

    Re-referred to Coms. on HEALTH and G.O.

  32. 2025-03-25 California Legislative Information

    From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.

  33. 2025-02-26 California Legislative Information

    Referred to Com. on RLS.

  34. 2025-02-20 California Legislative Information

    From printer. May be acted upon on or after March 22.

  35. 2025-02-19 California Legislative Information

    Introduced. Read first time. To Com. on RLS. for assignment. To print.

Official Summary Text

SB 503, as amended, Weber Pierson.
Health care services: artificial intelligence.
Existing law provides for the licensure and regulation of health facilities and clinics by the State Department of Public Health.
Existing law requires a health facility, clinic, physician’s office, or office of a group practice that uses generative artificial intelligence to generate written or verbal patient communications pertaining to patient clinical information, as defined, to ensure that those communications include both (1) a disclaimer that indicates to the patient that a communication was generated by generative artificial intelligence, as specified, and (2) clear instructions describing how a patient may contact a human health care provider, employee, or other appropriate person. Existing law exempts from this requirement a communication read and reviewed by a human licensed or certified health care provider.
This bill would require developers and deployers of artificial intelligence systems to make reasonable efforts to identify artificial intelligence systems used to support clinical decisionmaking or health care resource allocation that are known or have a reasonably foreseeable risk for biased impacts in the system’s outputs resulting from use of the system in health programs or activities. The bill would require developers and deployers to make reasonable efforts to mitigate the risk for biased impacts in the system’s outputs resulting from use of the system in health programs or activities. The bill would require deployers to regularly monitor these artificial intelligence systems and take reasonable and proportionate steps to mitigate any bias that may occur. The bill would specify that a person, partnership, state or local governmental agency, or corporation may be both a developer and a deployer.
The bill would require, beginning January 1, 2030, and at least
annually thereafter, a developer to submit their artificial intelligence systems to an independent third-party auditor to assess whether the developer has complied with the above-described provisions. The bill would require developers to make a summary of the audit publicly available on it’s internet website.
The bill would specify that the department is not required to independently inspect, test, or evaluate the functionality of an artificial intelligence system. The bill would require, beginning January 1, 2027, developers to provide a report identifying compliance efforts with the above-described provisions to the department before making an artificial intelligence system commercially or publicly
available to a deployer, as specified. The bill would require deployers, beginning January 1, 2027, to annually
provide the department with a report identifying their efforts to comply with identification, mitigation, and monitoring requirements established pursuant to these provisions. The bill would require the department to make these reports available on its internet website.

Current Bill Text

Read the full stored bill text
Download Bill PDF