---
type: "Bill"
title: "School Entry Immunization"
description: "The act codifies a definition of \"nonmedical exemption\" to mean an immunization exemption based upon a religious belief whose teachings are opposed to immunizations or a personal belief that is opposed to immunizations."
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2020A"
identifier: "SB 20-163"
citation: "Colorado SB 20-163 (2020A)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Dylan Roberts", "Julie Gonzales", "Kevin Priola", "Kyle Mullica"]
version_count: 9
action_count: 18
vote_count: 20
first_action: "2020-02-11T07:00:00+00:00"
last_action: "2020-06-26T06:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/45ac37af-1adc-4fd8-8367-2dbdecce2458"
source_url: "http://leg.colorado.gov/bills/sb20-163"
source_hash: "906859a735bc4a4c6ec33dc7cb6a122bf7cfed6fc3d7a741d30a664256827a7f"
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-co"]
---

# Colorado SB 20-163 (2020A) — School Entry Immunization

The act codifies a definition of "nonmedical exemption" to mean an immunization exemption based upon a religious belief whose teachings are opposed to immunizations or a personal belief that is opposed to immunizations.

## Version chain

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

1. **Committee Amendment** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/2020a_clsb163.pdf)
2. **Engrossed (02/27/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_eng.pdf)
3. **Final Act (06/19/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_enr.pdf)
4. **Introduced (02/11/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_01.pdf)
5. **PA1 (02/25/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163sapp_01.pdf)
6. **Reengrossed (02/28/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_ren.pdf)
7. **Rerevised (06/10/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_rer.pdf)
8. **Revised (06/09/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/documents/2020A/bills/2020a_163_rev.pdf)
9. **Signed Act (06/26/2020)** (committee substitute) — [source](http://leg.colorado.gov/sites/default/files/2020a_163_signed.pdf)

## Votes

- BILL — **40–24** (pass) · lower
- PERM — **29–31** (fail) · lower
- BILL — **20–14** (pass) · upper
- ADOPT CCR — **34–0** (pass) · upper
- AMD — **22–41** (fail) · lower
- ADOPT — **63–2** (pass) · lower
- AMD — **23–40** (fail) · lower
- AMD — **29–34** (fail) · lower
- AMD — **23–40** (fail) · lower
- NOT CONCUR APPT CC — **30–5** (pass) · upper
- AMD — **26–36** (fail) · lower
- COW * — **15–20** (fail) · upper
- REREFER — **24–39** (fail) · lower
- REPASS — **20–13** (pass) · upper
- COW * — **17–18** (fail) · upper
- COW * — **15–20** (fail) · upper
- AMD — **24–39** (fail) · lower
- AMD — **24–39** (fail) · lower
- REPASS — **41–24** (pass) · lower
- COW * — **16–19** (fail) · upper

## Sponsors

- Dylan Roberts — primary (person)
- Julie Gonzales — primary (person)
- Kevin Priola — primary (person)
- Kyle Mullica — primary (person)

## Timeline

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

- **2020-06-26T06:00:00+00:00** Governor Signed `executive-signature`
- **2020-06-19T06:00:00+00:00** Sent to the Governor `executive-receipt`
- **2020-06-19T06:00:00+00:00** Signed by the Speaker of the House
- **2020-06-18T06:00:00+00:00** Signed by the President of the Senate
- **2020-06-13T06:00:00+00:00** Senate Consideration of First Conference Committee Report result was to Adopt Committee Report - Repass
- **2020-06-13T06:00:00+00:00** House Consideration of First Conference Committee Report result was to Adopt Committee Report - Repass
- **2020-06-13T06:00:00+00:00** First Conference Committee Result was to Adopt Reengrossed w/ Amendments
- **2020-06-13T06:00:00+00:00** Senate Considered House Amendments - Result was to Not Concur - Request Conference Committee
- **2020-06-10T06:00:00+00:00** House Third Reading Passed - No Amendments `reading-3, passage`
- **2020-06-09T06:00:00+00:00** House Second Reading Special Order - Passed with Amendments - Floor
- **2020-06-09T06:00:00+00:00** House Committee on Appropriations Refer Unamended to House Committee of the Whole `committee-passage, referral-committee`
- **2020-06-07T06:00:00+00:00** House Committee on Health & Insurance Refer Unamended to Appropriations `referral-committee`
- **2020-03-02T07:00:00+00:00** Introduced In House - Assigned to Health & Insurance `introduction`
- **2020-02-28T07:00:00+00:00** Senate Third Reading Passed - No Amendments `reading-3, passage`
- **2020-02-27T07:00:00+00:00** Senate Second Reading Passed with Amendments - Committee, Floor `reading-2`
- **2020-02-25T07:00:00+00:00** Senate Committee on Appropriations Refer Amended to Senate Committee of the Whole `committee-passage, referral-committee`
- **2020-02-19T07:00:00+00:00** Senate Committee on Health & Human Services Refer Unamended to Appropriations `referral-committee`
- **2020-02-11T07:00:00+00:00** Introduced In Senate - Assigned to Health & Human Services `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/45ac37af-1adc-4fd8-8367-2dbdecce2458`. Confidence: reported (aggregated from official Colorado legislature records).