Wyo. Stat. Ann. § 34-24-127

A person aggrieved by a decision of the administrator or whose claim has not been acted upon within ninety (90) days after its filing may bring an action to establish the claim in the district court of the county where the claimant resides or in the district court of Laramie county, naming the administrator as a defendant. The action shall be brought within ninety (90) days after the decision of the administrator or within one hundred eighty (180) days after the filing of the claim if he has failed to act on it.