SB 503 California Senate · 2025-2026 Regular Session

Health care services: artificial intelligence.

Summary
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, as defined, of an artificial intelligence system that produces a prediction, classification, recommendation, evaluation, or analysis that aids decisionmaking related to diagnosis or treatment, known as a clinical decision support system, to make reasonable efforts to identify clinical decision support systems developed for use by deployers that are known or have a reasonably foreseeable risk for biased impacts resulting from deployment of the system in health programs or activities. The bill would require developers to make a statement describing the intended uses and known or reasonably foreseeable risks associated with the use of the clinical decision support system and certain documentation available to deployers, as specified. The bill would require developers to make reasonable efforts to mitigate known or reasonably foreseeable risk for biased impacts resulting from use of the clinical decision support system in health programs or activities. The bill would require deployers to regularly monitor clinical decision support systems and take reasonable and proportionate steps to mitigate known or reasonably foreseeable risk of biased impacts. The bill would specify that a person, partnership, state or local governmental agency, or corporation may be both a developer and a deployer.
Bill status passed both 4 of 5 stages cleared
Introduction
Feb 2025
Committee Review
Aug 2025
Senate Passage
May 2025
Assembly Passage
Aug 2026
Governor
Introduced Feb 19, 2025 Last action Aug 30, 2026
Maddy AI version diff · 9 comparisons

What changed between versions

08/19/26 - Amended Assembly 08/27/26 - Enrolled · 4 edits · Aug 27, 2026
MODERATE
The enrolled version of SB 503 removes an entire second section (Section 1339.76, Health and Safety Code) that had imposed broader obligations on AI systems used for clinical decisionmaking and health care resource allocation, including mandatory reporting to the State Department of Public Health beginning January 1, 2027. The bill now only adds Chapter 25.3 to the Business and Professions Code, limiting its scope to 'clinical decision support systems' as specifically defined. This narrows both the types of AI systems covered and eliminates all state reporting requirements.
SCOPE

Section 1339.76 of the Health and Safety Code is entirely removed. That section had applied to a broader category of 'artificial intelligence systems used to support clinical decisionmaking or health care resource allocation,' while the remaining Section 22758 only covers 'clinical decision support systems' (AI that produces predictions, classifications, recommendations, evaluations, or analyses aiding diagnosis or treatment).

The bill's title and scope statement change from 'to add Section 1339.76 to the Health and Safety Code' plus Chapter 25.3 to the Business and Professions Code, to only adding Chapter 25.3 to the Business and Professions Code. The legislative counsel digest is correspondingly shortened to remove references to health care resource allocation and reporting obligations.

ENFORCEMENT

All reporting requirements to the State Department of Public Health are eliminated. The removed section had required developers to file a compliance report before making a system commercially available and deployers to file annual compliance reports, both beginning January 1, 2027. The department would have made these reports publicly available on its website.

REQUIREMENT

The 'ongoing duty' language from the removed section is gone. While Section 22758 still requires identification, mitigation, and monitoring of biased impacts in clinical decision support systems, it no longer frames these as an ongoing duty tied to a regulatory reporting regime.

Floor votes · Senate May 29, 2025 · Assembly Aug 24, 2026

How they voted

380
Passed · 2 other
Total votes 40
May 29, 2025
D Democratic30
28 Yea 2
93% Yea
R Republican10
10 Yea
100% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
44
Key actions
17
Committee
9
Amendments
12
Aug 25, 2026
Upper · Passed
Assembly amendments concurred in. (Ayes 39. Noes 0.) Ordered to engrossing and enrolling.
upper
Aug 24, 2026
Introduced
In Senate. Concurrence in Assembly amendments pending.
upper
Aug 24, 2026
Lower · Passed
Read third time. Passed. Ordered to the Senate.
lower
Aug 19, 2026
Lower · Passed
Read third time and amended.
lower
Sep 4, 2025
Lower · Passed
Read third time and amended.
lower
Aug 29, 2025
Lower · Passed
From committee: Do pass. (Ayes 15. Noes 0.) (August 29).
lower
Jul 17, 2025
Lower · Passed
Read second time and amended. Re-referred to Com. on APPR.
lower
Jul 17, 2025
Lower · Passed
From committee: Do pass as amended and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (July 16).
lower
Jul 10, 2025
Lower · Passed
Read second time and amended. Re-referred to Com. on P. & C.P.
lower
Jul 9, 2025
Lower · Passed
From committee: Do pass as amended and re-refer to Com. on P. & C.P. (Ayes 16. Noes 0.) (July 8).
lower
Jun 30, 2025
Lower · Passed
From committee with author's amendments. Read second time and amended. Re-referred to Com. on HEALTH.
lower
Jun 24, 2025
Lower · Passed
July 1 hearing postponed by committee.
lower
Jun 5, 2025
Committee
Referred to Coms. on HEALTH and P. & C.P.
lower
May 29, 2025
Upper · Passed
Read third time. Passed. (Ayes 38. Noes 0. Page 1327.) Ordered to the Assembly.
upper
May 23, 2025
Upper · Passed
From committee: Do pass. (Ayes 6. Noes 0. Page 1202.) (May 23).
upper
Apr 30, 2025
Upper · Passed
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.
upper
Apr 23, 2025
Committee
Re-referred to Com. on JUD.
upper
Apr 10, 2025
Committee
Re-referred to Com. on RLS.
upper
Apr 10, 2025
Upper · Passed
Read second time and amended. Re-referred to Com. on G.O.
upper
Apr 10, 2025
Upper · Passed
From committee: Do pass as amended and re-refer to Com. on G.O. (Ayes 10. Noes 0. Page 737.) (April 9).
upper
Apr 2, 2025
Committee
Re-referred to Coms. on HEALTH and G.O.
upper
Mar 25, 2025
Upper · Passed
From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.
upper
Feb 26, 2025
Committee
Referred to Com. on RLS.
upper
Feb 19, 2025
Introduced
Introduced. Read first time. To Com. on RLS. for assignment. To print.
upper
1 primary · 11 co-sponsors

Sponsors