California Senate Bill 503
Session 20252026
Health care services: artificial intelligence.
Became Law
Became Law on Sep 30, 2026
Origin Chamber
Senate
Type
Bill
Bill Number
503
State
California
Session
20252026
Motion Text
Unfinished Business SB503 Weber Pierson et al. Concurrence
Senate Roll Call Votes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
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.
02/19/25 - Introduced
February 19, 2025
03/25/25 - Amended Senate
March 25, 2025
04/10/25 - Amended Senate
April 10, 2025
06/30/25 - Amended Assembly
June 30, 2025
07/10/25 - Amended Assembly
July 10, 2025
07/17/25 - Amended Assembly
July 17, 2025
09/04/25 - Amended Assembly
September 4, 2025
08/19/26 - Amended Assembly
August 19, 2026
08/27/26 - Enrolled
August 27, 2026
04/07/25- Senate Health
April 7, 2025
04/25/25- Senate Judiciary
April 25, 2025
05/09/25- Senate Appropriations
May 9, 2025
05/26/25- Sen. Floor Analyses
May 26, 2025
07/03/25- Assembly Health
July 3, 2025
07/15/25- Assembly Privacy and Consumer Protection
July 15, 2025
08/18/25- Assembly Appropriations
August 18, 2025
09/02/25- ASSEMBLY FLOOR ANALYSIS
September 2, 2025
09/05/25- ASSEMBLY FLOOR ANALYSIS
September 5, 2025
08/21/26- ASSEMBLY FLOOR ANALYSIS
August 21, 2026
08/24/26- Sen. Floor Analyses
August 24, 2026
Sort by most recent
09/30/2026
California State Legislature
Chaptered by Secretary of State. Chapter 857, Statutes of 2026.
09/30/2026
California State Legislature
Approved by the Governor.
08/30/2026
California State Legislature
Enrolled and presented to the Governor at 6 p.m.
08/25/2026
Senate
Assembly amendments concurred in. (Ayes 39. Noes 0.) Ordered to engrossing and enrolling.
08/24/2026
Senate
In Senate. Concurrence in Assembly amendments pending.
08/24/2026
Assembly
Read third time. Passed. (Ayes 70. Noes 1. Page 6384.) Ordered to the Senate.
08/19/2026
Assembly
Ordered to third reading.
08/19/2026
Assembly
Read third time and amended.
08/12/2026
Assembly
Ordered to third reading.
08/12/2026
Assembly
From inactive file.
08/11/2026
Assembly
Notice of intention to remove from inactive file given by Assembly Member Wilson.
09/10/2025
Assembly
Ordered to inactive file on request of Assembly Member Aguiar-Curry.
09/04/2025
Assembly
Ordered to third reading.
09/04/2025
Assembly
Read third time and amended.
09/02/2025
Assembly
Read second time. Ordered to third reading.
08/29/2025
Assembly
From committee: Do pass. (Ayes 15. Noes 0.) (August 29).
08/20/2025
Assembly
August 20 set for first hearing. Placed on APPR. suspense file.
07/17/2025
Assembly
Read second time and amended. Re-referred to Com. on APPR.
07/17/2025
Assembly
From committee: Do pass as amended and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (July 16).
07/17/2025
Assembly
Assembly Rule 63 suspended. (Ayes 49. Noes 15. Page 2578.)
07/10/2025
Assembly
Read second time and amended. Re-referred to Com. on P. & C.P.
07/09/2025
Assembly
From committee: Do pass as amended and re-refer to Com. on P. & C.P. (Ayes 16. Noes 0.) (July 8).
06/30/2025
Assembly
From committee with author's amendments. Read second time and amended. Re-referred to Com. on HEALTH.
06/24/2025
Assembly
July 1 hearing postponed by committee.
06/05/2025
Assembly
Referred to Coms. on HEALTH and P. & C.P.
05/29/2025
Assembly
In Assembly. Read first time. Held at Desk.
05/29/2025
Senate
Read third time. Passed. (Ayes 38. Noes 0. Page 1327.) Ordered to the Assembly.
05/27/2025
Senate
Ordered to special consent calendar.
05/23/2025
Senate
Read second time. Ordered to third reading.
05/23/2025
Senate
From committee: Do pass. (Ayes 6. Noes 0. Page 1202.) (May 23).
05/16/2025
Senate
Set for hearing May 23.
05/12/2025
Senate
May 12 hearing: Placed on APPR. suspense file.
05/02/2025
Senate
Set for hearing May 12.
04/30/2025
Senate
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.
04/23/2025
Senate
Re-referred to Com. on JUD.
04/22/2025
Senate
Set for hearing April 29 in JUD. pending receipt.
04/10/2025
Senate
Re-referred to Com. on RLS.
04/10/2025
Senate
Withdrawn from committee.
04/10/2025
Senate
Read second time and amended. Re-referred to Com. on G.O.
04/10/2025
Senate
From committee: Do pass as amended and re-refer to Com. on G.O. (Ayes 10. Noes 0. Page 737.) (April 9).
04/02/2025
Senate
Set for hearing April 9.
04/02/2025
Senate
Re-referred to Coms. on HEALTH and G.O.
03/25/2025
Senate
From committee with author's amendments. Read second time and amended. Re-referred to Com. on RLS.
02/26/2025
Senate
Referred to Com. on RLS.
02/20/2025
Senate
From printer. May be acted upon on or after March 22.
02/19/2025
Senate
Introduced. Read first time. To Com. on RLS. for assignment. To print.
Sources
Record Created
Feb 20, 2025 5:55:37 AM
Record Updated
Oct 1, 2026 1:27:57 PM