Missouri Impairment Rating Guide
Missouri workers' compensation uses the 4th Edition of the AMA Guides to the Evaluation of Permanent Impairment under Mo. Rev. Stat. § 287.190.
Which Edition?
AMA Guides Edition 4th Edition
Statutory Authority
Mo. Rev. Stat. § 287.190
PPD Calculation
Statutory Maximum Weeks 400 weeks
Body-as-a-whole PPD weeks = WPI% × 400 weeks. Scheduled losses use statutory week values per body part.
Notes
AMA Guides 4th Edition is the prevailing reference, though not strictly mandated by statute.
Frequently Asked Questions
Which edition of the AMA Guides does Missouri use?
Missouri uses the 4th Edition of the AMA Guides to the Evaluation of Permanent Impairment under Mo. Rev. Stat. § 287.190. 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 Missouri?
Body-as-a-whole PPD weeks = WPI% × 400 weeks. Scheduled losses use statutory week values per body part.
Where can I find a certified impairment rater in Missouri?
Browse our directory of certified impairment raters listed for Missouri. 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.
List Your Practice in Missouri
No certified raters are listed in Missouri yet — be the first to join the directory.
Submit Your Information →