HB 399 Montana House · 2025 Regular Session

Revise prior authorization laws

HB 399 revises prior authorization laws for health insurance issuers, aiming to simplify access to certain prescription drugs for covered individuals. The bill prohibits prior authorization for oral and inhaled generic prescription drugs, inhaled medications for asthma or chronic lung diseases, and insulin for diabetes patients. It also restricts prior authorization for generic drugs used consistently for six months and for dosage adjustments within approved limits. If an insurer makes an adverse determination for a prescription drug, the decision must be made by a specialist physician, and the insurer must provide a list of covered therapeutic alternatives.
Bill status signed all 5 stages cleared
Introduction
Feb 2025
Committee Review
Mar 2025
House Passage
Apr 2025
Senate Passage
Apr 2025
Signed into Law
Apr 2025
Introduced Feb 5, 2025 Signed Apr 17, 2025
Maddy AI version diff · 3 comparisons

What changed between versions

HB0399_2(10).pdf HB0399_X.pdf · 3 edits
MINOR
This bill updates the text of HB 399 to reflect its final enrolled version, correcting formatting inconsistencies and standardizing capitalization. The substantive policy content regarding restrictions on prior authorization for specific medications remains unchanged.
Scope change
No change to the bill's scope or applicability; the changes are purely technical and editorial.
TECHNICAL

Corrected inconsistent capitalization in the bill title and act description to use standard sentence case instead of all caps.

Adjusted line breaks and spacing to align with standard enrolled bill formatting.

Included certification signatures and dates for the House and Senate, indicating the bill has been officially passed and signed into law.

Floor votes · Senate Apr 3, 2025 · House Mar 4, 2025

How they voted

3812
Passed
Total votes 50
Apr 3, 2025
D Democratic18
18 Yea
100% Yea
R Republican32
20 Yea 12 Nay
62% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
43
Key actions
9
Committee
7
Apr 16, 2025
Signed into law
(H) Signed by Governor
lower
Apr 9, 2025
Upper · Passed
(S) Signed by President
upper
Apr 7, 2025
Lower · Passed
(H) Signed by Speaker
lower
Apr 3, 2025
Senate · Passed
Senate Vote: pass (38-12)
senate
Mar 24, 2025
Upper · Passed
(S) Committee Report - (S) Business, Labor and Economic Affairs
upper
Mar 24, 2025
Upper · Passed
(S) Committee Executive Action - (S) Business, Labor and Economic Affairs
upper
Mar 5, 2025
Committee
(S) Referred to Committee - (S) Business, Labor and Economic Affairs
upper
Mar 4, 2025
House · Passed
House Vote: pass (86-13-1)
house
Feb 27, 2025
Lower · Passed
(H) Committee Report - (H) Business and Labor
lower
Feb 27, 2025
Lower · Passed
(H) Committee Executive Action - (H) Business and Labor
lower
Feb 10, 2025
Committee
(H) Rereferred to Committee - (H) Business and Labor
lower
Feb 6, 2025
Committee
(H) Referred to Committee - (H) Human Services
lower
Feb 5, 2025
Introduced
(H) Introduced
lower
1 primary · 0 co-sponsors

Sponsors

Role
Legislator
Party
State
District
P
Photo of Jonathan Karlen
Jonathan Karlen
DDemocratic
MT
98