---
type: "Bill"
title: "Worker's compensation: disabilities; certain occupational diseases; extend presumption of causation to part-time, paid on-call, and volunteer firefighters. Amends sec. 405 of 1969 PA 317 (MCL 418.405)."
description: "Worker's compensation: disabilities; certain occupational diseases; extend presumption of causation to part-time, paid on-call, and volunteer firefighters. Amends sec. 405 of 1969 PA 317 (MCL 418.405)."
jurisdiction: "us/states/mi"
legislature: "Michigan Legislature"
session: "2021-2022"
identifier: "HB 4172"
citation: "Michigan HB 4172 (2021-2022)"
classification: ["bill"]
subjects: ["Law enforcement: fire personnel", "Worker's compensation: disabilities"]
status: "enacted"
primary_sponsors: ["Jeff Yaroch"]
version_count: 5
action_count: 31
vote_count: 3
first_action: "2021-02-09T05:00:00+00:00"
last_action: "2021-12-15T05:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/4fb9b8af-1c07-40db-b206-5ffada281564"
source_url: "http://legislature.mi.gov/doc.aspx?2021-HB-4172"
source_hash: "9a0cdbdf702e02c4c4e9cf8032c61d28eec90814d1bf3ff94418558bd3a483df"
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-mi"]
---

# Michigan HB 4172 (2021-2022) — Worker's compensation: disabilities; certain occupational diseases; extend presumption of causation to part-time, paid on-call, and volunteer firefighters. Amends sec. 405 of 1969 PA 317 (MCL 418.405).

## Version chain

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

1. **As Passed by the House** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billengrossed/House/htm/2021-HEBH-4172.htm)
2. **As Passed by the Senate** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billengrossed/House/htm/2021-HEBS-4172.htm)
3. **House Concurred Bill** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billconcurred/House/htm/2021-HCB-4172.htm)
4. **House Introduced Bill** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/billintroduced/House/htm/2021-HIB-4172.htm)
5. **Public Act** (committee substitute) — [source](http://legislature.mi.gov/documents/2021-2022/publicact/htm/2021-PA-0129.htm)

## Votes

- roll call Roll Call # 579 Yeas 96 Nays 3 Excused 0 Not Voting 8 — **96–3** (pass) · lower
- PASSED; GIVEN IMMEDIATE EFFECT ROLL CALL # 435 YEAS 35 NAYS 0 EXCUSED 1 NOT VOTING 0 — **35–0** (pass) · upper
- passed; given immediate effect Roll Call # 51 Yeas 106 Nays 3 Excused 0 Not Voting 1 — **106–3** (pass) · lower

## Sponsors

- Jeff Yaroch — primary (person)
- Abraham Aiyash — cosponsor (person)
- Douglas Wozniak — cosponsor (person)
- Gregory Markkanen — cosponsor (person)
- Jack O'Malley — cosponsor (person)
- Jim Haadsma — cosponsor (person)
- Joseph Tate — cosponsor (person)
- Julie Brixie — cosponsor (person)
- Kelly Breen — cosponsor (person)
- Ken Borton — cosponsor (person)
- Kevin Hertel — cosponsor (person)
- Mark Tisdel — cosponsor (person)
- Rachel Hood — cosponsor (person)
- Sue Allor — cosponsor (person)
- Terry Sabo — cosponsor (person)

## Timeline

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

- **2021-02-09T05:00:00+00:00** introduced by Representative Jeff Yaroch `introduction`
- **2021-02-09T05:00:00+00:00** read a first time `reading-1`
- **2021-02-09T05:00:00+00:00** referred to Committee on Insurance `referral-committee`
- **2021-02-10T05:00:00+00:00** bill electronically reproduced 02/09/2021
- **2021-03-04T05:00:00+00:00** reported with recommendation with substitute (H-1) `committee-passage`
- **2021-03-04T05:00:00+00:00** referred to second reading
- **2021-03-16T04:00:00+00:00** read a second time `reading-2`
- **2021-03-16T04:00:00+00:00** substitute (H-1) adopted
- **2021-03-16T04:00:00+00:00** placed on third reading
- **2021-03-17T04:00:00+00:00** read a third time `reading-3`
- **2021-03-17T04:00:00+00:00** passed; given immediate effect Roll Call # 51 Yeas 106 Nays 3 Excused 0 Not Voting 1 `passage`
- **2021-03-17T04:00:00+00:00** transmitted
- **2021-03-18T04:00:00+00:00** REFERRED TO COMMITTEE ON INSURANCE AND BANKING `referral-committee`
- **2021-10-28T04:00:00+00:00** REPORTED FAVORABLY WITHOUT AMENDMENT `committee-passage`
- **2021-10-28T04:00:00+00:00** COMMITTEE RECOMMENDED IMMEDIATE EFFECT
- **2021-10-28T04:00:00+00:00** REFERRED TO COMMITTEE OF THE WHOLE `referral-committee`
- **2021-11-02T04:00:00+00:00** REPORTED BY COMMITTEE OF THE WHOLE FAVORABLY WITH SUBSTITUTE (S-1) `committee-passage`
- **2021-11-02T04:00:00+00:00** SUBSTITUTE (S-1) CONCURRED IN
- **2021-11-02T04:00:00+00:00** PLACED ON ORDER OF THIRD READING WITH SUBSTITUTE (S-1)
- **2021-11-10T05:00:00+00:00** PASSED; GIVEN IMMEDIATE EFFECT ROLL CALL # 435 YEAS 35 NAYS 0 EXCUSED 1 NOT VOTING 0 `passage`
- **2021-11-10T05:00:00+00:00** INSERTED FULL TITLE
- **2021-11-10T05:00:00+00:00** returned from Senate with substitute (S-1) with immediate effect and full title
- **2021-11-10T05:00:00+00:00** laid over one day under the rules
- **2021-12-02T05:00:00+00:00** Senate substitute (S-1) concurred in
- **2021-12-02T05:00:00+00:00** roll call Roll Call # 579 Yeas 96 Nays 3 Excused 0 Not Voting 8
- **2021-12-02T05:00:00+00:00** full title agreed to
- **2021-12-02T05:00:00+00:00** bill ordered enrolled
- **2021-12-07T05:00:00+00:00** presented to the Governor 12/07/2021 03:10 PM `executive-receipt`
- **2021-12-15T05:00:00+00:00** approved by the Governor 12/16/2021 05:35 PM `executive-signature`
- **2021-12-15T05:00:00+00:00** filed with Secretary of State 12/17/2021 04:26 PM
- **2021-12-15T05:00:00+00:00** assigned PA 129'21 with immediate effect

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/4fb9b8af-1c07-40db-b206-5ffada281564`. Confidence: reported (aggregated from official Michigan legislature records).