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---
type: "Bill"
title: "AN ACT CONCERNING IMMUNIZATIONS."
description: "AN ACT CONCERNING IMMUNIZATIONS."
jurisdiction: "us/states/ct"
legislature: "Connecticut General Assembly"
session: "2021"
identifier: "HB 6423"
citation: "Connecticut HB 6423 (2021)"
classification: ["bill"]
subjects: ["Child day care", "Committees", "Health insurance", "Immunization", "Physician assistants", "Public Health", "Department of", "Religion", "Reports", "School attendance"]
status: "enacted"
primary_sponsors: ["Elliott, Josh", "Luxenberg, Geoff", "Meskers, Stephen R", "Santiago, Hilda E.", "Smith, Frank", "Stallworth, Charlie L."]
version_count: 5
action_count: 36
vote_count: 0
first_action: "2021-02-10"
last_action: "2021-05-06"
source: "openstates"
source_identifier: "ocd-bill/6e21b232-d206-4d58-b707-9e1d7ea1dc68"
source_url: "ftp://ftp.cga.ct.gov/pub/data/bill_info.csv"
source_hash: "02f13f38a65be23a92f52b230c44be529e834718028ef70e43d46eba5ac63470"
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-ct"]
---
# Connecticut HB 6423 (2021) — AN ACT CONCERNING IMMUNIZATIONS.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **APP Joint Favorable** (committee substitute) — [source](https://www.cga.ct.gov/2021/TOB/H/PDF/2021HB-06423-R02-HB.PDF)
2. **File No. 431** (committee substitute) — [source](https://www.cga.ct.gov/2021/FC/PDF/2021HB-06423-R000431-FC.PDF)
3. **PH Joint Favorable Substitute** (committee substitute) — [source](https://www.cga.ct.gov/2021/TOB/H/PDF/2021HB-06423-R01-HB.PDF)
4. **Public Act No. 21-6** (committee substitute) — [source](https://www.cga.ct.gov/2021/ACT/PA/PDF/2021PA-00006-R00HB-06423-PA.PDF)
5. **Raised Bill** (committee substitute) — [source](https://www.cga.ct.gov/2021/TOB/H/PDF/2021HB-06423-R00-HB.PDF)
## Sponsors
- Elliott, Josh — primary (person)
- Luxenberg, Geoff — primary (person)
- Meskers, Stephen R — primary (person)
- Santiago, Hilda E. — primary (person)
- Smith, Frank — primary (person)
- Stallworth, Charlie L. — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2021-02-10** REF. TO JOINT COMM. ON Public Health `referral-committee`
- **2021-02-11** PUBLIC HEARING 0216
- **2021-03-31** Joint Favorable Substitute `committee-passage-favorable`
- **2021-04-05** FILED WITH LCO
- **2021-04-13** REFERRED TO Office of Legislative Research AND Office of Fiscal Analysis 04/19/21
- **2021-04-14** RPTD. OUT OF LCO
- **2021-04-14** FAV. RPT., TABLED FOR HOUSE CALENDAR
- **2021-04-14** HOUSE CALENDAR NUMBER 323
- **2021-04-14** FILE NO. 431
- **2021-04-14** REF. BY HOUSE TO COMMITTEE ON Appropriations `referral-committee`
- **2021-04-15** Joint Favorable `committee-passage-favorable`
- **2021-04-15** FILED WITH LCO
- **2021-04-15** RPTD. OUT OF LCO
- **2021-04-15** NO NEW FILE BY COMM. ON Appropriations `referral-committee`
- **2021-04-15** TABLED FOR HOUSE CALENDAR
- **2021-04-19** HOUSE ADOPTED HOUSE AMEND. SCH. A
- **2021-04-19** HOUSE REJECTED HOUSE AMEND. SCH. B
- **2021-04-19** HOUSE REJECTED HOUSE AMEND. SCH. C
- **2021-04-19** HOUSE REJECTED HOUSE AMEND. SCH. D
- **2021-04-19** HOUSE REJECTED HOUSE AMEND. SCH. E
- **2021-04-19** HOUSE REJECTED HOUSE AMEND. SCH. F
- **2021-04-19** HOUSE ADOPTED HOUSE AMEND. SCH. G
- **2021-04-19** HOUSE PASSED, HOUSE AMEND. SCH. A,G `passage`
- **2021-04-20** FAV. RPT., TAB. FOR CAL., SEN.
- **2021-04-20** SENATE CALENDAR NUMBER 320
- **2021-04-27** SEN. ADOPTED HO. AMEND. SCH. A,G
- **2021-04-27** SEN. REJ. SEN. AMEND. SCH. A
- **2021-04-27** SEN. REJ. SEN. AMEND. SCH. B
- **2021-04-27** SEN. REJ. SEN. AMEND. SCH. C
- **2021-04-27** SEN. REJ. SEN. AMEND. SCH. D
- **2021-04-27** SEN. PASSED, HO. AMEND. SCH. A,G `passage`
- **2021-04-27** IN CONCURRENCE
- **2021-04-27** RULES SUSPENDED, TRANSMITTED TO THE GOVERNOR
- **2021-04-28** SIGNED BY GOVERNOR IN ORIGINAL `executive-signature`
- **2021-05-05** PUBLIC ACT 21-6
- **2021-05-06** TRANSMITTED TO SECRETARY OF THE STATE
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/6e21b232-d206-4d58-b707-9e1d7ea1dc68`. Confidence: reported (aggregated from official Connecticut legislature records).