What changed in the 6th
The 6th introduced a consistent impairment-class and grade framework, whole-person impairment calculation, and stronger functional focus. The 2024/2025 digital updates revised the musculoskeletal and nervous-system chapters — training is offered by ACOEM and others.
State adoption
California uses the 5th (Labor Code 4660). Pennsylvania requires the 6th (2nd printing 2009). Tennessee's approved training list mandates 6th Edition training. Florida uses its own schedule. Verify the edition per state before rating.
Why it matters
The same clinical findings can produce different ratings across editions — the exact source of cross-examiner disputes.
Which edition applies is a jurisdictional fact, not a physician preference. Of the 10 states profiled in this hub, 1 works to the 5th, 2 require the 6th, 4 leave the edition to the agency, and 2 use their own schedule instead of the AMA Guides at all.
Key facts
| 5th Edition (2000) | California standard (LC 4660); DRE/ROM spine methods; diagnosis-based |
| 6th Edition (2008/2023) | Pennsylvania, Tennessee, Montana and others; standardized methodology aligned with ICF |
| 2023/2025 updates | Musculoskeletal chapters (upper limb, lower limb, spine) and nervous system updated |
| Key takeaway | Edition choice is jurisdictional, not physician preference |
