Oregon court backs employer's right to deny a combined condition claim – and still pay disability on the original injury.
The Oregon Court of Appeals on April 29, 2026, affirmed a Workers' Compensation Board order that upheld Legacy Health's denial of a nurse's combined condition claim, reinforcing an employer's ability to separate an accepted workplace injury from a broader, preexisting medical picture when the work injury is no longer driving the bus.
The case centered on Mark S. Mooney, a nurse at Legacy Health who hurt himself while moving a patient. Legacy Health accepted a claim for disabling C7 radiculopathy – essentially a pinched nerve in the neck – and Mooney had surgery. But Mooney also had a complicated medical history: a childhood injury had left him with a cervical spinal fusion and a neurological condition called Brown-Sequard Syndrome.
After surgery, medical evidence showed that Mooney's work-related radiculopathy had combined with those preexisting cervical conditions. On May 5, 2021, Legacy Health amended its acceptance to cover the combined condition, folding in the preexisting fusion, Brown-Sequard Syndrome, and cervical spondylosis at C6-7. Then, just one day later on May 6, 2021, the employer turned around and denied that same combined condition, pointing to medical opinions that the surgery had resolved the radiculopathy and it was no longer the main driver of Mooney's disability or treatment needs.
Legacy Health then closed the claim and awarded Mooney 19 percent whole person impairment and work disability, but only for the original accepted radiculopathy – not the combined condition.
Mooney pushed back. He argued before an administrative law judge and the Board that the disability award at closure was fundamentally at odds with the denial. His reasoning: if the employer was still paying him disability benefits tied to the radiculopathy, the work injury must still be the major contributing cause of his overall condition. He also contended that the way the employer calculated his loss of range of motion at closure effectively treated the claim as a combined condition, which he said amounted to an admission that the work injury was still driving things.
Neither the ALJ nor the Board bought it, and the Court of Appeals agreed.
Under Oregon law, a combined condition is compensable only so long as the work injury remains the major contributing cause of the disability or need for treatment. Once a worker establishes an otherwise compensable injury, the burden shifts to the employer to prove the work injury no longer meets that threshold. Here, the court found Legacy Health met that burden. The medical evidence supported the conclusion that the radiculopathy had been resolved by surgery and was no longer the major contributing cause of Mooney's combined condition.
On the apportionment question, the court pointed to Caren v. Providence Health System Oregon, a 2019 Oregon Supreme Court decision, which established that once a combined condition is properly denied, an employer can split benefits between the accepted injury and the denied combined condition. Legacy Health did exactly that – it paid only for the impairment attributable to the radiculopathy itself, not the broader combined condition. The court found no inconsistency between the closure award and the denial.
For workers' compensation carriers, self-insured employers, and claims professionals, the decision is a practical reminder that denying a combined condition and closing a claim with a disability award on the underlying accepted injury are not contradictory actions. They are, in fact, two sides of the same statutory process. The ruling underscores the importance of building a clean medical record that clearly distinguishes between impairment caused by the accepted injury and impairment tied to preexisting conditions – because that distinction is what allows the apportionment to hold up on review.
