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---
type: "Bill"
title: "Ensuring transparency in prior authorization"
description: "Ensuring transparency in prior authorization"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2019"
identifier: "HB 555"
citation: "Montana HB 555 (2019)"
classification: ["bill"]
subjects: ["Health Care Services (see also: Health)", "Insurance", "Rule Making", "Social Services"]
status: "enacted"
primary_sponsors: ["Dennis R Lenz"]
version_count: 6
action_count: 74
vote_count: 10
first_action: "2019-01-07"
last_action: "2019-05-20"
source: "openstates"
source_identifier: "ocd-bill/9990c0e7-9c7c-4c52-a584-93d9ac902461"
source_url: "http://laws.leg.mt.gov/legprd/LAW0210W$BSIV.ActionQuery?P_BILL_NO1=555&P_BLTP_BILL_TYP_CD=HB&Z_ACTION=Find&P_SESS=20191"
source_hash: "42710f11c3c5099910866504a70544928f39530a980e53a07009010653f9394b"
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-mt"]
---
# Montana HB 555 (2019) — Ensuring transparency in prior authorization
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **HB0555_1.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2019/HB0599//HB0555_1.pdf)
2. **HB0555_2.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2019/HB0599//HB0555_2.pdf)
3. **HB0555_3.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2019/HB0599//HB0555_3.pdf)
4. **HB0555_4.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2019/HB0599//HB0555_4.pdf)
5. **HB0555_x.pdf** (committee substitute) — [source](https://leg.mt.gov/bills/2019/HB0599//HB0555_x.pdf)
6. **Enrolled** (enrolled) — [source](http://leg.mt.gov/bills/2019/billpdf/HB0555.pdf)
## Votes
- Do Pass — **909** (pass) · lower
- Do Pass — **8316** (pass) · lower
- DO PASS AS AMENDED — **172** (pass) · lower
- Do Pass — **7921** (pass) · lower
- Do Concur — **500** (pass) · upper
- Do Concur — **8812** (pass) · lower
- BE CONCURRED IN AS AMENDED — **100** (pass) · upper
- DO PASS AS AMENDED — **148** (pass) · lower
- Do Concur — **897** (pass) · lower
- Do Concur — **500** (pass) · upper
## Sponsors
- Dennis R Lenz — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2019-01-07** Draft Request Received
- **2019-02-13** Draft to Requester for Review
- **2019-02-14** Fiscal Note Probable
- **2019-02-14** Draft in Legal Review
- **2019-02-15** Draft in Edit
- **2019-02-15** Draft to Drafter - Edit Review [CMD]
- **2019-02-15** Draft in Input/Proofing
- **2019-02-15** Draft in Final Drafter Review
- **2019-02-15** Bill Draft Text Available Electronically
- **2019-02-15** Executive Director Review
- **2019-02-16** Draft in Assembly
- **2019-02-16** Executive Director Final Review
- **2019-02-16** Draft Ready for Delivery
- **2019-02-18** Draft Delivered to Requester
- **2019-02-19** Fiscal Note Requested
- **2019-02-19** Introduced `introduction`
- **2019-02-19** Referred to Committee `referral-committee`
- **2019-02-19** First Reading `reading-1`
- **2019-02-19** Introduced Bill Text Available Electronically
- **2019-02-22** Hearing
- **2019-02-25** Committee Executive Action--Bill Passed as Amended `committee-passage`
- **2019-02-26** Fiscal Note Received
- **2019-02-26** Fiscal Note Signed
- **2019-02-26** Fiscal Note Printed
- **2019-02-26** Committee Report--Bill Passed as Amended `committee-passage`
- **2019-02-26** Printed - New Version Available
- **2019-02-27** Revised Fiscal Note Requested
- **2019-02-28** Scheduled for 2nd Reading
- **2019-02-28** 2nd Reading Passed `reading-2`
- **2019-02-28** Rereferred to Committee `referral-committee`
- **2019-02-28** Hearing
- **2019-02-28** Tabled in Committee `amendment-deferral`
- **2019-02-28** Revised Fiscal Note Received
- **2019-02-28** Revised Fiscal Note Signed
- **2019-03-11** Revised Fiscal Note Printed
- **2019-03-22** Taken from Table in Committee
- **2019-03-22** Tabled in Committee `amendment-deferral`
- **2019-03-29** Taken from Table in Committee
- **2019-03-29** Committee Executive Action--Bill Passed as Amended `committee-passage`
- **2019-03-29** Committee Report--Bill Passed as Amended `committee-passage`
- **2019-03-29** Printed - New Version Available
- **2019-03-30** Scheduled for 2nd Reading
- **2019-03-30** 2nd Reading Passed `reading-2`
- **2019-04-01** Scheduled for 3rd Reading
- **2019-04-01** 3rd Reading Passed `passage, reading-3`
- **2019-04-01** Transmitted to Senate
- **2019-04-02** Revised Fiscal Note Requested
- **2019-04-02** First Reading `reading-1`
- **2019-04-02** Referred to Committee `referral-committee`
- **2019-04-10** Hearing
- **2019-04-10** Committee Executive Action--Bill Concurred as Amended
- **2019-04-11** Committee Report--Bill Concurred as Amended
- **2019-04-11** Printed - New Version Available
- **2019-04-13** Scheduled for 2nd Reading
- **2019-04-13** Revised Fiscal Note Requested
- **2019-04-13** 2nd Reading Concurred `reading-2`
- **2019-04-15** Scheduled for 3rd Reading
- **2019-04-15** Revised Fiscal Note Received
- **2019-04-15** Revised Fiscal Note Signed
- **2019-04-15** 3rd Reading Concurred `passage, reading-3`
- **2019-04-15** Returned to House with Amendments
- **2019-04-16** Revised Fiscal Note Printed
- **2019-04-17** Scheduled for 2nd Reading
- **2019-04-17** 2nd Reading Senate Amendments Concurred `amendment-passage, amendment-amendment, reading-2`
- **2019-04-18** Scheduled for 3rd Reading
- **2019-04-18** 3rd Reading Passed as Amended by Senate `passage, reading-3`
- **2019-04-18** Sent to Enrolling
- **2019-04-24** Returned from Enrolling
- **2019-04-25** Printed - Enrolled Version Available
- **2019-04-26** Signed by Speaker
- **2019-04-30** Signed by President
- **2019-05-01** Transmitted to Governor `executive-receipt`
- **2019-05-10** Signed by Governor `executive-signature`
- **2019-05-20** Chapter Number Assigned
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/9990c0e7-9c7c-4c52-a584-93d9ac902461`. Confidence: reported (aggregated from official Montana legislature records).