Warren Properties and Ace American Insurance Company v. Janice Stewart, 864 N.W.2d 307

Background

Janice Stewart worked concurrently for Wal‑Mart and Warren Properties; she injured her back at Wal‑Mart in Nov 2006 and later settled that claim (contested settlement based on 40% industrial disability).
While still employed by Warren Properties, Stewart fell on ice Feb 2, 2009 and sought treatment for back and shoulder pain; medical opinions differed on whether the 2009 fall caused new permanent impairment.
A deputy commissioner credited a physician (Dr. Stoken) and awarded benefits for a 2009 injury (13% whole‑body impairment for the back and shoulder), applying the full‑responsibility rule with no apportionment for the 2006 disability; the commissioner affirmed.
The district court held the commissioner erred by not apportioning the preexisting 2006 disability and remanded to determine whether the 2009 fall caused any new back disability; both parties appealed.
The Supreme Court held that when a preexisting disability arose from employment with a different employer (or nonwork causes) and the employee’s earning capacity was not reevaluated in the competitive labor market (or otherwise reevaluated) before the successive injury, the successive employer is not liable for the preexisting disability; benefits must be computed under Iowa Code §85.34(2)(u) and apportioned per §85.34(7)(a).

Issues

Issue	Plaintiff's Argument (Stewart)	Defendant's Argument (Warren Properties)	Held
Whether employer must apportion preexisting disability from a prior injury at a different employer when employee remained with same employer (concurrent employment)	Stewart: No apportionment; continued employment at Warren Properties gave her a fresh start and no market reevaluation was needed.	Warren: Statute requires apportionment for preexisting disability from a different employer because market reevaluation did not occur.	Held: Apportionment required—if no competitive‑market reevaluation or other evidence showing restored earning capacity, successive employer not liable for preexisting disability under §85.34(7)(a).
Whether commissioner properly applied full‑responsibility (no apportionment) rule when awarding benefits for 2009 injury	Stewart: Commissioner correctly found 2009 fall aggravated preexisting condition and caused additional disability; no apportionment required.	Warren: Commissioner legally erred by failing to apportion and should receive credit for prior 40% loss paid by Wal‑Mart.	Held: Commissioner erred by not apportioning; remand required to recompute benefits under §85.34(2)(u) with apportionment per §85.34(7)(a).
Whether evidence supported finding of a new impairment from the 2009 fall	Stewart: Medical evidence (Dr. Stoken) supported new shoulder impairment and aggravation to back; 50% industrial disability supported.	Warren: Medical evidence does not establish increased functional impairment beyond the 2006 level; no new disability.	Held: Substantial evidence supports that 2009 injury caused some additional impairment (shoulder and increased industrial disability), so remand for proper computation rather than outright reversal.
Proper method to compute benefits for successive unscheduled disabilities when no market reevaluation occurred	Stewart: (implicit) use commissioner’s prior computation without apportionment.	Warren: Use apportionment/credit tied to prior settlement or offset.	Held: Use the §85.34(2)(u) formula—compare reduction in earning capacity caused by the successive injury to the earning capacity possessed at the time of the successive injury (excluding prior unrecovered loss); example computation provided by Court.

Key Cases Cited

Roberts Dairy v. Billick, 861 N.W.2d 814 (Iowa 2015) (interpreting 2004 amendments and preserving fresh‑start when competitive market reevaluation occurs)
Neal v. Annett Holdings, Inc., 814 N.W.2d 512 (Iowa 2012) (standard for judicial review of agency action)
Ziegler v. U.S. Gypsum Co., 106 N.W.2d 591 (Iowa 1960) (aggravation compensable to extent of new injury; origins of full‑responsibility/fresh‑start rules)
Swiss Colony, Inc. v. Deutmeyer, 789 N.W.2d 129 (Iowa 2010) (remand for recalculation under correct legal standard)
Yeager v. Firestone Tire & Rubber Co., 112 N.W.2d 299 (Iowa 1961) (cannot recover twice for a preexisting permanent impairment; need new impairment for successive award)
Bridgestone/Firestone v. Accordino, 561 N.W.2d 60 (Iowa 1997) (agency must articulate decision process to permit judicial review)