He can as long as he associates local counsel. He cannot appear before the court in Utah unless he does so under the court's express permission. You can learn more by contacting the Washington State Bar Association for these rules.
He should be alright to take the case and try to settle it with the insurance company. If it does not get settled, and he needs to file a lawsuit in court in Utah, he will need to associate with a Utah attorney.
A lawyer may be admitted pro hac vice for a specific matter. Utah court rules will specify the procedure. However, you may just want to find local counsel. Local counsel will know the court procedures and the tendencies of the local judges. This allows them to tailor their arguments for the judge they are in front of on a given case. A lot of people feel they have been "home towned" thinking the judge showed favoritism to the local lawyer. The reality is usually that the local lawyer knows the best way to present their arguments to a given judge.
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