Montana Impairment Rating Guide
Montana workers' compensation uses the 6th Edition of the AMA Guides to the Evaluation of Permanent Impairment under Mont. Code Ann. § 39-71-711.
Which Edition?
AMA Guides Edition 6th Edition
Statutory Authority
Mont. Code Ann. § 39-71-711(opens in a new tab)
PPD Calculation
Statutory Maximum Weeks 400 weeks
PPD weeks = (WPI% + applicable statutory additions for age, education, wage loss, and physical-capacity loss) × 400 weeks. Weekly benefit rate = 66⅔% of wages at injury, subject to the statutory cap. Mont. Code Ann. §§ 39-71-703 and 39-71-711.
Notes
AMA Guides 6th Edition specified by statute for injuries on/after July 1, 2011.
Frequently Asked Questions
Which edition of the AMA Guides does Montana use?
Montana uses the 6th Edition of the AMA Guides to the Evaluation of Permanent Impairment under Mont. Code Ann. § 39-71-711. The applicable edition is generally determined by the worker's date of injury; consult counsel for cases that straddle effective-date transitions.
How is permanent partial disability calculated in Montana?
PPD weeks = (WPI% + applicable statutory additions for age, education, wage loss, and physical-capacity loss) × 400 weeks. Weekly benefit rate = 66⅔% of wages at injury, subject to the statutory cap. Mont. Code Ann. §§ 39-71-703 and 39-71-711.
Where can I find a certified impairment rater in Montana?
Browse our directory of certified impairment raters listed for Montana. View the directory →
Does this information constitute legal or medical advice?
No. This page provides general statutory and methodological information for educational purposes only. Statutes change, case law shifts controlling interpretation, and individual cases turn on facts beyond what reference material can capture. Consult qualified legal counsel and a credentialed rating physician for any specific matter.
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