Oregon Expands “Attending Physician” – What HB 4040 Actually Changes
House Bill 4040 (2026) marks a significant shift in Oregon workers’ compensation practice by expanding who may serve as an “attending physician.” Effective immediately upon passage in April 2026, the law amends ORS 656.005(12) to fully include nurse practitioners (NPs) and physician associates (PAs) within that role, eliminating the longstanding 180-day limitation that previously restricted their authority.
The practical effect is straightforward but substantial: NPs and PAs may now serve as the attending physician for the full duration of a claim, from inception through closure, with the same authority historically exercised by MDs and DOs. This includes directing treatment, authorizing temporary disability, determining medically stationary status, issuing work restrictions, and making impairment findings.
This change removes what was often an artificial transition point in claim management. Under the prior framework, claims frequently required a midstream handoff solely due to provider type, even when the NP or PA had been the primary treating provider. That forced transition is now gone. The statute aligns legal authority with how care is actually delivered in practice.
The Workers’ Compensation Division has already begun implementing the change. Bulletin 239 was revised in April 2026 to remove references to “authorized nurse practitioners” and confirm that NPs are now included in the definition of attending physician. Temporary rule updates to OAR 436-010 and OAR 436-015 are also underway to bring administrative rules into alignment with the statute. In practice, any remaining references to the 180-day limitation in MCO guidelines or insurer workflows are now superseded.
Does HB 4040 Apply Retroactively?
One of the most common questions is whether HB 4040 applies retroactively. The answer is IT DEPENDS.
The law applies immediately to all open and active claims, including claims that are reopened. However, it is not retroactive in the sense of undoing or rewriting past decisions.
The statute does not reopen closed claims, reverse prior denials, or create automatic entitlement to benefits for periods already adjudicated. Insurers are not required to revisit historical claim handling simply because the law has changed.
What it does do is govern the current status of any claim that is active today.
That distinction matters. Because the change is definitional, expanding who qualifies as an attending physician, it applies to the present and future handling of claims, not to finalized decisions in the past.
What This Means in Practice
For open claims, the implications are immediate:
A worker may now designate a NP or PA as the attending physician using the standard Form 827 process. This applies even if the worker previously had to switch providers solely because of the 180-day limitation. That prior restriction is no longer a valid basis to deny a change.
If claimant had previously switched to an MD because of the 180-day rule but now switches back to a PA/NP of their choice, the usual “initial choice of attending physician plus two changes” framework under OAR 436-010-0220(2) still applies. However, provider type is no longer a limiting factor within that structure. If a worker prefers an NP or PA over a current MD, the switch is evaluated under the same standards as any other attending physician change.
For reopened claims, whether through an ARU rescission of a Notice of Closure or an aggravation claim, the law applies in full as soon as the claim becomes active again. A NP or PA may immediately assume the attending physician role.
Temporary disability presents a more nuanced issue. A NP or PA may now authorize ongoing (prospective) time loss without limitation. However, retroactive entitlement to time loss for periods previously cut off under the 180-day rule is likely not automatic. This area would likely require Judicial clarification based on new decision. In many cases, it will require a dispute, particularly where there is an intervening release-to-work from another provider.
Similarly, NPs and PAs may now fully support aggravation claims under ORS 656.273. They can provide the necessary medical opinions and objective findings and authorize related treatment and disability, just as any attending physician could.
Practical Considerations
Although the statutory change is immediate, implementation still depends on proper process.
The attending physician must be clearly designated, typically through Form 827. Medical opinions, especially those that differ from prior providers, should be well documented. MCO requirements remain in place, though any conflicting provisions tied to the 180-day rule are no longer enforceable.
Early disputes are likely as insurers and administrators adjust to the new framework. Issues surrounding retroactive time loss, change-of-physician limits, and conflicting medical opinions will likely be the first areas of litigation.
Takeaway
HB 4040 is best understood as a forward-looking change. It does not revisit the past, but it immediately reshapes how active claims are managed. The law directly advances its stated goal of improving rural access and continuity of care. Testimony supporting the bill emphasized that NPs and PAs often serve as the primary providers in rural and underserved communities. Under the prior framework, the 180-day cap forced unnecessary transfers of care, resulting in delays, increased travel burdens, and avoidable costs. The new structure allows injured workers to remain with a consistent provider, reducing administrative friction and promoting more efficient recovery, particularly for small employers and industries operating outside urban centers.
By eliminating the 180-day limitation and fully recognizing NPs and PAs as attending physicians, the law removes a structural inefficiency that often disrupted continuity of care. At the same time, it preserves the fundamental requirement that a single attending physician be clearly identified and that claim decisions flow from that provider’s authority.
For employers, insurers, and practitioners, the adjustment is less about learning a new system and more about applying existing rules to a broader pool of providers. Those who adapt quickly will avoid unnecessary disputes. Those who rely on outdated assumptions about provider authority will not.
If you have questions regarding attending physician authority, feel free to contact me at or (503) 776-5423.
Posted by Dee Akinbosade.
