Wyo. Stat. Ann. § 26-15-137

An action or request for reimbursement of any overpayment of a health insurance claim to a health care provider pursuant to any health insurance contract shall be brought not more than two (2) years after the date the claim was paid. No insurer, assignee of the insurer, or other person, whether acting for himself or another in connection with a health insurance transaction, shall make any claim or seek recovery for reimbursement of any overpayment to a health care provider pursuant to any health insurance contract more than two (2) years after the date the claim was paid, unless the claim was fraudulent.