California 20252026 Regular Session Status: To Executive 2 D cosponsors

SB 503 — Health care services: artificial intelligence.

Last action — Approved by the Governor.

  1. ✓
    Introduced
  2. ✓
    In Committee
  3. ✓
    Passed Senate
  4. ✓
    Passed Assembly
  5. 5
    To Executive
  6. 6
    Enacted

This bill has been sent to the executive. Introduced February 19, 2025. It awaits signature.

Next likely step: the executive signs it into law or issues a veto.

Odds of enactment

Moderate chance

Based on the sponsor, cosponsors, and committee posture, this bill has a moderate chance of becoming law.

Upgrade to see the exact probability and what's driving it.

A statistical estimate from our own model of past outcomes — an insight, not a guarantee. Policymaking is volatile.

Prognosis

Likely to advance 74% · moderate confidence

  • To Executive

    Current position in the legislative process.

  • 12 sponsors

    1 primary, 11 co-sponsors signed on.

  • Single-party support

    Sponsorship is currently within one party (2 D).

  • Cleared a recorded vote

    Passed 10 recorded votes so far.

Based on stage, sponsorship breadth, committee status, recorded votes, and cross-state momentum — a description of the observable signals, not a prediction.

In plain language

The bill regulates the use of AI in healthcare, focusing on bias mitigation and patient communication.

This bill mandates that AI systems used in healthcare provide clear disclosures to patients and outlines bias mitigation requirements for developers and deployers. It aims to ensure that AI technologies used in clinical settings are transparent and monitored for potential biases that may affect patient care.

What this means for you
  • Workers: Workers in healthcare may need to adapt to new guidelines regarding the use of AI and its implications for patient interaction.
  • Families: Families may have access to better-informed healthcare decisions as AI systems are regulated for bias and transparency.
  • Healthcare: Healthcare providers must ensure AI communications are clear and include disclaimers, fostering trust with patients.

Summary

Health care services: artificial intelligence.

Bill Text

Action History

  1. Approved by the Governor.

  2. Enrolled and presented to the Governor at 6 p.m.

  3. Assembly amendments concurred in. (Ayes 39. Noes 0.) Ordered to engrossing and enrolling.

  4. In Senate. Concurrence in Assembly amendments pending.

  5. Read third time. Passed. (Ayes 70. Noes 1. Page 6384.) Ordered to the Senate.

  6. Read third time and amended.

  7. Ordered to third reading.

  8. From inactive file.

  9. Ordered to third reading.

  10. Notice of intention to remove from inactive file given by Assembly Member Wilson.

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

  12. Read third time and amended.

  13. Ordered to third reading.

  14. Read second time. Ordered to third reading.

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

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

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

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

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

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

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

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

  23. July 1 hearing postponed by committee.

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

  25. In Assembly. Read first time. Held at Desk.

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

  27. Ordered to special consent calendar.

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

  29. Read second time. Ordered to third reading.

  30. Set for hearing May 23.

  31. May 12 hearing: Placed on APPR. suspense file.

  32. Set for hearing May 12.

  33. 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.

  34. Re-referred to Com. on JUD.

  35. Set for hearing April 29 in JUD. pending receipt.

  36. Re-referred to Com. on RLS.

  37. Withdrawn from committee.

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

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

  40. Set for hearing April 9.

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

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

  43. Referred to Com. on RLS.

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

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

Sponsors

  • Weber Pierson · Primary
  • Bonta · Cosponsor
  • Bryan · Cosponsor
  • Elhawary · Cosponsor
  • Gipson · Cosponsor
  • Jackson · Cosponsor
  • McKinnor · Cosponsor
  • Ransom · Cosponsor
  • Sharp-Collins · Cosponsor
  • Wilson · Cosponsor
  • Laura Richardson · Cosponsor
  • Lola Smallwood-Cuevas · Cosponsor

Sponsorship breakdown

Export CSV (upgrade) →

1 sponsors · 11 co-sponsors · 110 not signed on · 1 voted No

Sponsors (1)

  • Weber Pierson

Co-sponsors (11)

Not signed on (110)

110 members have not signed on to this bill.

Show all 110 →

"Not signed on" means a member has not sponsored or co-sponsored this bill — it does not imply opposition. Members flagged Voted No have a recorded No vote on this bill.

Whip count is in markup. Polling the chamber and every recorded vote this session. Only the first open is slow. It’s instant for you after this. Calling the roll · Tallying · Engrossing

Votes

Unfinished Business SB503 Weber Pierson et al. Concurrence

Passed 39 Yea · 0 Nay · 1 Other
Party YeaNayPresentNot Voting
Unaffiliated 6000
Republican 8001
Democratic 25000
Total 39001
% of votes cast 98%0%0%3%
How each member voted (40)
Member Party Vote
Allen — Yea
Gonzalez — Yea
Ochoa Bogh — Yea
Pérez — Yea
Rubio — Yea
Weber Pierson — Yea
Archuleta, Bob Democratic Yea
Arreguín, Jesse Democratic Yea
Ashby, Angelique V. Democratic Yea
Becker, Josh Democratic Yea
Blakespear, Catherine S. Democratic Yea
Cabaldon, Christopher Democratic Yea
Caballero, Anna M. Democratic Yea
Cervantes, Sabrina Democratic Yea
Cortese, Dave Democratic Yea
Durazo, Maria Elena Democratic Yea
Grayson, Timothy S. Democratic Yea
Hurtado, Melissa Democratic Yea
Laird, John Democratic Yea
Limón, Monique Democratic Yea
McGuire, Mike Democratic Yea
McNerney, Jerry Democratic Yea
Menjivar, Caroline Democratic Yea
Padilla, Stephen C. Democratic Yea
Reyes, Eloise Gómez Democratic Yea
Richardson, Laura Democratic Yea
Smallwood-Cuevas, Lola Democratic Yea
Stern, Henry I. Democratic Yea
Umberg, Thomas J. Democratic Yea
Wahab, Aisha Democratic Yea
Wiener, Scott D. Democratic Yea
Alvarado-Gil, Marie Republican Yea
Choi, Steven S. Republican Yea
Dahle, Megan Republican Yea
Grove, Shannon Republican Yea
Jones, Brian W. Republican Yea
Niello, Roger W. Republican Yea
Seyarto, Kelly Republican Yea
Strickland, Tony Republican Yea
Valladares, Suzette Martinez Republican Not Voting

Official roll call →

SB 503 Weber Pierson Senate Third Reading By Wilson

Passed 70 Yea · 1 Nay · 8 Other
Party YeaNayPresentNot Voting
Republican 10107
Democratic 53001
Unaffiliated 7000
Total 70108
% of votes cast 89%1%0%10%
How each member voted (79)
Member Party Vote
Patterson — Yea
Ávila Farías — Yea
Rivas — Yea
Carrillo — Yea
Fong — Yea
Garcia — Yea
Lowenthal — Yea
Addis, Dawn Democratic Yea
Aguiar-Curry, Cecilia M. Democratic Yea
Ahrens, Patrick Democratic Yea
Alvarez, David Democratic Yea
Arambula, Joaquin Democratic Yea
Bains, Jasmeet Democratic Yea
Bauer-Kahan, Rebecca Democratic Yea
Bennett, Steve Democratic Yea
Berman, Marc Democratic Yea
Boerner, Tasha Democratic Yea
Bonta, Mia Democratic Yea
Bryan, Isaac G. Democratic Yea
Calderon, Lisa Democratic Yea
Caloza, Jessica Democratic Yea
Connolly, Damon Democratic Yea
Elhawary, Sade Democratic Yea
Gabriel, Jesse Democratic Yea
Gipson, Mike A. Democratic Yea
González, Mark Democratic Yea
Haney, Matt Democratic Yea
Harabedian, John Democratic Yea
Hart, Gregg Democratic Yea
Irwin, Jacqui Democratic Yea
Jackson, Corey A. Democratic Yea
Kalra, Ash Democratic Yea
Krell, Maggy Democratic Yea
Lee, Alex Democratic Yea
McKinnor, Tina Democratic Not Voting
Muratsuchi, Al Democratic Yea
Nguyen, Stephanie Democratic Yea
Ortega, Liz Democratic Yea
Pacheco, Blanca Democratic Yea
Papan, Diane Democratic Yea
Patel, Darshana R. Democratic Yea
Pellerin, Gail Democratic Yea
Petrie-Norris, Cottie Democratic Yea
Quirk-Silva, Sharon Democratic Yea
Ramos, James C. Democratic Yea
Ransom, Rhodesia Democratic Yea
Rodriguez, Celeste Democratic Yea
Rodriguez, Michelle Democratic Yea
Rogers, Chris Democratic Yea
Rubio, Blanca E. Democratic Yea
Schiavo, Pilar Democratic Yea
Schultz, Nick Democratic Yea
Sharp-Collins, LaShae Democratic Yea
Solache, Jr., José Luis Democratic Yea
Soria, Esmeralda Democratic Yea
Stefani, Catherine Democratic Yea
Valencia, Avelino Democratic Yea
Ward, Christopher M. Democratic Yea
Wicks, Buffy Democratic Yea
Wilson, Lori D. Democratic Yea
Zbur, Rick Chavez Democratic Yea
Alanis, Juan Republican Yea
Castillo, Leticia Republican Not Voting
Chen, Phillip Republican Yea
Davies, Laurie Republican Yea
DeMaio, Carl Republican Nay
Dixon, Diane Republican Yea
Ellis, Stan Republican Yea
Flora, Heath Republican Yea
Gonzalez, Jeff Republican Yea
Hadwick, Heather Republican Not Voting
Hoover, Josh Republican Not Voting
Johnson, Natasha Republican Not Voting
Lackey, Tom Republican Not Voting
Macedo, Alexandra Republican Not Voting
Sanchez, Kate Republican Yea
Ta, Tri Republican Yea
Tangipa, David J. Republican Not Voting
Wallis, Greg Republican Yea

Official roll call →

Do pass.

Passed 15 Yea · 0 Nay
Party YeaNayPresentNot Voting
Republican 4000
Democratic 11000
Total 15000
% of votes cast 100%0%0%0%
How each member voted (15)
Member Party Vote
Ahrens, Patrick Democratic Yea
Arambula, Joaquin Democratic Yea
Calderon, Lisa Democratic Yea
Caloza, Jessica Democratic Yea
Elhawary, Sade Democratic Yea
Fong, Mike Democratic Yea
González, Mark Democratic Yea
Pacheco, Blanca Democratic Yea
Pellerin, Gail Democratic Yea
Solache, Jr., José Luis Democratic Yea
Wicks, Buffy Democratic Yea
Dixon, Diane Republican Yea
Sanchez, Kate Republican Yea
Ta, Tri Republican Yea
Tangipa, David J. Republican Yea

Official roll call →

Do pass as amended and be re-referred to the Committee on [Appropriations]

Passed 13 Yea · 0 Nay · 2 Other
Party YeaNayPresentNot Voting
Democratic 11000
Republican 2002
Total 13002
% of votes cast 87%0%0%13%
How each member voted (15)
Member Party Vote
Bauer-Kahan, Rebecca Democratic Yea
Bryan, Isaac G. Democratic Yea
Irwin, Jacqui Democratic Yea
Lowenthal, Josh Democratic Yea
McKinnor, Tina Democratic Yea
Ortega, Liz Democratic Yea
Pellerin, Gail Democratic Yea
Petrie-Norris, Cottie Democratic Yea
Ward, Christopher M. Democratic Yea
Wicks, Buffy Democratic Yea
Wilson, Lori D. Democratic Yea
DeMaio, Carl Republican Not Voting
Dixon, Diane Republican Yea
Macedo, Alexandra Republican Not Voting
Patterson, Joe Republican Yea

Official roll call →

Do pass as amended and be re-referred to the Committee on [Privacy and Consumer Protection]

Passed 16 Yea · 0 Nay
Party YeaNayPresentNot Voting
Democratic 12000
Republican 4000
Total 16000
% of votes cast 100%0%0%0%
How each member voted (16)
Member Party Vote
Addis, Dawn Democratic Yea
Aguiar-Curry, Cecilia M. Democratic Yea
Bonta, Mia Democratic Yea
Caloza, Jessica Democratic Yea
Elhawary, Sade Democratic Yea
González, Mark Democratic Yea
Patel, Darshana R. Democratic Yea
Rodriguez, Celeste Democratic Yea
Rogers, Chris Democratic Yea
Schiavo, Pilar Democratic Yea
Sharp-Collins, LaShae Democratic Yea
Stefani, Catherine Democratic Yea
Chen, Phillip Republican Yea
Ellis, Stan Republican Yea
Flora, Heath Republican Yea
Sanchez, Kate Republican Yea

Official roll call →

Special Consent SB503 Weber Pierson et al.

Passed 38 Yea · 0 Nay · 2 Other
Party YeaNayPresentNot Voting
Democratic 28002
Republican 10000
Total 38002
% of votes cast 95%0%0%5%
How each member voted (40)
Member Party Vote
Allen, Benjamin Democratic Yea
Archuleta, Bob Democratic Yea
Arreguín, Jesse Democratic Yea
Ashby, Angelique V. Democratic Yea
Becker, Josh Democratic Yea
Blakespear, Catherine S. Democratic Yea
Cabaldon, Christopher Democratic Yea
Caballero, Anna M. Democratic Yea
Cervantes, Sabrina Democratic Yea
Cortese, Dave Democratic Yea
Durazo, Maria Elena Democratic Yea
Gonzalez, Lena A. Democratic Yea
Grayson, Timothy S. Democratic Yea
Hurtado, Melissa Democratic Yea
Laird, John Democratic Yea
Limón, Monique Democratic Not Voting
McGuire, Mike Democratic Yea
McNerney, Jerry Democratic Yea
Menjivar, Caroline Democratic Yea
Padilla, Stephen C. Democratic Yea
Pérez, Sasha Renée Democratic Yea
Reyes, Eloise Gómez Democratic Not Voting
Richardson, Laura Democratic Yea
Rubio, Susan Democratic Yea
Smallwood-Cuevas, Lola Democratic Yea
Stern, Henry I. Democratic Yea
Umberg, Thomas J. Democratic Yea
Wahab, Aisha Democratic Yea
Weber Pierson, M.D., Akilah Democratic Yea
Wiener, Scott D. Democratic Yea
Alvarado-Gil, Marie Republican Yea
Choi, Steven S. Republican Yea
Dahle, Megan Republican Yea
Grove, Shannon Republican Yea
Jones, Brian W. Republican Yea
Niello, Roger W. Republican Yea
Ochoa Bogh, Rosilicie Republican Yea
Seyarto, Kelly Republican Yea
Strickland, Tony Republican Yea
Valladares, Suzette Martinez Republican Yea

Official roll call →

Do pass, but first be re-referred to the Committee on [Appropriations]

Passed 13 Yea · 0 Nay
Party YeaNayPresentNot Voting
Democratic 11000
Republican 2000
Total 13000
% of votes cast 100%0%0%0%
How each member voted (13)
Member Party Vote
Allen, Benjamin Democratic Yea
Arreguín, Jesse Democratic Yea
Ashby, Angelique V. Democratic Yea
Caballero, Anna M. Democratic Yea
Durazo, Maria Elena Democratic Yea
Laird, John Democratic Yea
Stern, Henry I. Democratic Yea
Umberg, Thomas J. Democratic Yea
Wahab, Aisha Democratic Yea
Weber Pierson, M.D., Akilah Democratic Yea
Wiener, Scott D. Democratic Yea
Niello, Roger W. Republican Yea
Valladares, Suzette Martinez Republican Yea

Official roll call →

Do pass as amended, but first amend, and re-refer to the Committee on [Governmental Organization]

Passed 10 Yea · 0 Nay · 1 Other
Party YeaNayPresentNot Voting
Democratic 9000
Republican 1001
Total 10001
% of votes cast 91%0%0%9%
How each member voted (11)
Member Party Vote
Durazo, Maria Elena Democratic Yea
Gonzalez, Lena A. Democratic Yea
Limón, Monique Democratic Yea
Menjivar, Caroline Democratic Yea
Padilla, Stephen C. Democratic Yea
Richardson, Laura Democratic Yea
Rubio, Susan Democratic Yea
Weber Pierson, M.D., Akilah Democratic Yea
Wiener, Scott D. Democratic Yea
Grove, Shannon Republican Yea
Valladares, Suzette Martinez Republican Not Voting

Official roll call →

Subjects

healthcare technology
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Frequently asked questions

What does SB 503 do?
Health care services: artificial intelligence.
Who sponsors SB 503?
SB 503 is sponsored by Weber Pierson, Bonta, Bryan, Elhawary, Gipson, Jackson, McKinnor, Ransom, Sharp-Collins, Wilson, Richardson, Laura (Democratic), and Smallwood-Cuevas, Lola (Democratic).
What is the current status of SB 503?
This bill has been sent to the executive. Introduced February 19, 2025. It awaits signature.
Where can I track SB 503?
Track SB 503 free on One Click Politics — get push/email alerts when it moves.

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