republic-os/legislation/us/states/ca/20232024/ab-1842.md

---
type: "Bill"
title: "Health care coverage: Medication-assisted treatment."
description: "Existing law, the Knox–Keene Health Care Service Plan Act of 1975, provides for the licensure and regulation of health care service plans by the Department of Managed Health Care and makes a willful violation of the act a crime. Existing law also provides for the regulation of health insurers by the Department of Insurance. Existing law authorizes health care service plans and health insurers that cover prescription drugs to utilize reasonable medical management practices, including prior authorization and step therapy, consistent with applicable law."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20232024"
identifier: "AB 1842"
citation: "California AB 1842 (20232024)"
classification: ["bill"]
subjects: ["Health care coverage", "Medication-assisted treatment"]
status: "enacted"
primary_sponsors: ["Reyes"]
version_count: 6
action_count: 22
vote_count: 7
first_action: "2024-01-16"
last_action: "2024-09-27"
source: "openstates"
source_identifier: "ocd-bill/541a68bf-3f47-4fc8-b759-ce15e85eded9"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB1842"
source_hash: "58568258d4615ef9cdf4ca836b134c7a6c4ae11f934d3d5399ad3e78c8001f36"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-ca"]
---

# California AB 1842 (20232024) — Health care coverage: Medication-assisted treatment.

Existing law, the Knox–Keene Health Care Service Plan Act of 1975, provides for the licensure and regulation of health care service plans by the Department of Managed Health Care and makes a willful violation of the act a crime. Existing law also provides for the regulation of health insurers by the Department of Insurance. Existing law authorizes health care service plans and health insurers that cover prescription drugs to utilize reasonable medical management practices, including prior authorization and step therapy, consistent with applicable law.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **01/16/24 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1842&version=20230AB184299INT)
2. **05/20/24 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1842&version=20230AB184298AMD)
3. **08/22/24 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1842&version=20230AB184297AMD)
4. **09/27/24 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1842&version=20230AB184295CHP)
5. **AB1842** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB1842)
6. **09/03/24 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1842&version=20230AB184296ENR)

## Votes

- AB 1842 Reyes Assembly Third Reading — **73–0** (pass) · lower
- Do pass and be re-referred to the Committee on [Appropriations] — **13–0** (pass) · lower
- Do pass — **7–0** (pass) · upper
- 3rd Reading AB1842 Reyes et al. By Limón — **39–0** (pass) · upper
- Do pass. — **14–0** (pass) · lower
- Do pass, but first be re-referred to the Committee on [Appropriations] — **11–0** (pass) · upper
- AB 1842 Reyes Concurrence in Senate Amendments — **75–0** (pass) · lower

## Sponsors

- Reyes — primary (person)
- Arambula — coauthor (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2024-01-16** Read first time. To print. `reading-1`
- **2024-01-17** From printer. May be heard in committee February 16.
- **2024-01-29** Referred to Com. on HEALTH. `referral-committee`
- **2024-03-19** From committee: Do pass and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (March 19). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2024-04-10** From committee: Do pass. (Ayes 14. Noes 0.) (April 10). `committee-passage, committee-passage-favorable`
- **2024-04-11** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2024-04-29** Read third time. Passed. Ordered to the Senate. (Ayes 73. Noes 0. Page 5031.) `passage, reading-1, reading-3`
- **2024-04-29** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2024-05-08** Referred to Com. on HEALTH. `referral-committee`
- **2024-05-20** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on HEALTH. `amendment-introduction, amendment-passage, reading-1, reading-2, referral-committee`
- **2024-05-29** From committee: Do pass and re-refer to Com. on APPR. (Ayes 11. Noes 0.) (May 29). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2024-06-10** From committee: Do pass. (Ayes 7. Noes 0.) (June 10). `committee-passage, committee-passage-favorable`
- **2024-06-11** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2024-08-22** Read third time and amended. Ordered to second reading. `amendment-passage, reading-1, reading-3`
- **2024-08-26** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2024-08-28** Read third time. Passed. Ordered to the Assembly. (Ayes 38. Noes 0.). `passage, reading-1, reading-3`
- **2024-08-28** In Assembly. Concurrence in Senate amendments pending. May be considered on or after August 30 pursuant to Assembly Rule 77.
- **2024-08-29** Assembly Rule 77 suspended.
- **2024-08-29** Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 75. Noes 0.). `amendment-passage, committee-passage-favorable`
- **2024-09-11** Enrolled and presented to the Governor at 4 p.m.
- **2024-09-27** Approved by the Governor. `executive-signature`
- **2024-09-27** Chaptered by Secretary of State - Chapter 633, Statutes of 2024. `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/541a68bf-3f47-4fc8-b759-ce15e85eded9`. Confidence: reported (aggregated from official California legislature records).