Petitioner seeks review of an order of an administrative law judge (ALJ) determining that respondent Liberty Northwest Insurance Corporation was not liable for payment to petitioner for medications dispensed by the Tillamook Fred Meyer pharmacy (Fred Meyer) to a workers’ compensation claimant from December 15, 2003 through May 12, 2004. ^[1] Petitioner did not preserve before the ALJ a contention that is essential to its success on judicial review. Accordingly, we affirm.

The underlying circumstances in this payment dispute are arcane, and a detailed recitation of those circumstances would not benefit the bench, bar, or public. It suffices to say that, before the ALJ, petitioner contended that respondent was required to pay petitioner for the medications dispensed by Fred Meyer because petitioner was a “[mjedical [p]rovider” within the meaning of OAR 436-010-0005(29) or an “agent” of such a provider. The ALJ rejected those contentions. On judicial review, petitioner does not dispute that determination; rather, petitioner contends that, even if it was not a “medical provider” or an “agent” of Fred Meyer, it was an “assignee” of Fred Meyer’s right to payment and, as such, was entitled to be paid by respondent. Petitioner acknowledges that, to prevail on judicial review, it must prevail on that contention.

Respondent counters, and we agree, that that contention was not raised and preserved for the ALJ’s consideration. Arguing that one is entitled to payment as an “agent” is qualitatively different from arguing an entitlement to payment as an “assignee.” Nor did petitioner’s contentions as to the former reasonably alert the ALJ that petitioner was, alternatively, asserting the latter. In sum, petitioner failed to preserve a contention that is essential to its success on judicial review.

Affirmed.