In the Matter of the Worker's Compensation Claim of: Tommy Hood v. State of Wyoming, ex rel., Department of Workforce Services, Workers' Compensation Division, 382 P.3d 772

Hood suffered a compensable neck injury at work in December 2008 and underwent cervical fusion in March 2010.
Beginning April 2011, Hood experienced recurrent syncope (brief losses of consciousness); he testified he never had syncope before the neck surgery.
The Division paid for diagnostic workups and treatment of injuries resulting from falls during syncopal episodes without contesting those payments.
On February 11, 2013 Hood sustained a lower back injury in a fall during a syncopal episode; conservative treatment failed and lumbar discography showed tears, leading to a request for lumbar surgery.
The Division denied preauthorization after independent medical reviewers found no causal link between the cervical injury/surgery and the syncope; the Medical Commission and the district court affirmed.

Issue	Hood's Argument	Division's Argument	Held
Whether the Division is estopped from denying authorization for lumbar surgery because it previously paid syncope-related medical bills	Division’s prior uncontested payments establish causation or otherwise preclude relitigation (collateral estoppel)	Uncontested payments do not bind the Division on causation for future benefits; claimant must still prove causation	Denial of estoppel: prior uncontested payments do not preclude Division from contesting causation for future claims
Whether the Commission acted arbitrarily/capriciously by discounting Hood’s testimony that syncope was caused by his neck injury/surgery	Commission should have credited Hood’s testimony (he had no syncope before surgery; first syncopal event followed a neck “pop”)	Medical causation is complex; expert opinion is required and unanimous expert views found no causal link	No arbitrary or capricious action: Commission reasonably relied on unanimous expert opinions over non-expert testimony; substantial evidence supports rejection of causation

Dale v. S & S Builders, LLC, 188 P.3d 554 (Wyo. 2008) (standard for substantial evidence review and weighing agency factfinding)
Jacobs v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 301 P.3d 137 (Wyo. 2013) (uncontested Division payments do not preclude future challenges to causation)
Tenorio v. State ex rel. Wyo. Workers’ Comp. Div., 931 P.2d 234 (Wyo. 1997) (collateral estoppel principles in workers’ compensation context)
Bush v. State ex rel. Wyo. Workers’ Comp. Div., 120 P.3d 176 (Wyo. 2005) (definition of substantial evidence)
Johnson v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 321 P.3d 318 (Wyo. 2014) (claimant bears burden to prove causal connection)
Middlemass v. State ex rel. Wyo. Workers’ Safety & Comp. Div., 259 P.3d 1161 (Wyo. 2011) (when expert causation evidence is required)
Thornberg v. State ex rel. Wyo. Workers’ Comp. Div., 913 P.2d 863 (Wyo. 1996) (distinguishing cases where expert testimony is unnecessary)