Gross v. WORKERS'COMPENSATION COM'N, 960 N.E.2d 587

William Gross, 64, sought benefits under the Occupational Diseases Act for COPD.
He alleged long-term inhalation of coal mine dust (and other pollutants) during his 39 years in mining.
He worked at two aboveground Freeman United mines in various roles, including electrician, with dust exposure ongoing.
Medical evidence showed COPD with both coal dust exposure and heavy smoking history; experts disagreed on causation.
Arbitrator denied benefits for COPD; Commission affirmed; circuit court confirmed; appeal followed.
Court reverses, remanding to determine if COPD is causally related to employment and whether disablement exists.

Issue	Plaintiff's Argument	Defendant's Argument	Held
Did coal-dust exposure contribute to COPD?	Gross argues COPD was caused in part by coal dust exposure.	Renn argues COPD was solely due to tobacco smoking.	Yes; COPD contribution by coal dust is not clearly refuted.
Is the Commission's COPD ruling against the manifest weight of the evidence?	Record supports coal-dust causation; Dr. Renn lacks adequate basis.	Commission correctly weighed expert testimony in favor of no coal-dust causation.	Yes; reversal required; remand for disablement determination.

Docksteiner v. Industrial Comm'n, 346 Ill.App.3d 851 (2004) (fact-finding and credibility for Commission; weight of evidence review)
Setzekorn v. Industrial Comm'n, 353 Ill.App.3d 1049 (2004) (choice between conflicting medical opinions)
Bernardoni v. Industrial Comm'n, 362 Ill.App.3d 582 (2005) (causal connection required between disease and employment)
In re Joseph S., 339 Ill.App.3d 599 (2003) (expert opinions must be grounded in underlying facts)
Kleiss v. Cassida, 297 Ill.App.3d 165 (1998) (reliability of expert opinions; basis for conclusions)
Modelski v. Navistar International Transportation Corp., 302 Ill.App.3d 879 (1999) (experts' bases must not be speculative)
Montgomery Elevator Co. v. Industrial Comm'n, 244 Ill.App.3d 563 (1993) (manifest-weight review standard)