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in any recording district in the state. However, a lien filed under this subsection is not perfected and has no effect unless notice of filing of the lien is served by the department upon the third- party payor, personally or by registered, certified, or insured mail, return receipt requested. (c) If a recipient of medical assistance under this title settles a claim or obtains an award or judgment arising from the injury or illness for which the medical assistance was received, the amount of the lien to which the department is entitled under (a) of this section shall be reduced by a pro rata share of the attorney fees and litigation costs. Regardless of the manner in which the amount of the attorney fees is derived in the particular case, the pro rata reduction of the lien shall be calculated in accordance with the applicable rules of court governing the award of attorney fees in civil matters. (d) A perfected lien under this section has priority over all other liens except tax liens and a lien perfected for attorney fees and costs. Sec. 47.05.080. Recovery of overpayments. (a) Except for overpayments recovered under AS 47.07 that cover the value of services paid from federal sources, benefit overpayments collected by the department in administering public assistance programs under AS 47.05.010 shall be remitted to the Department of Revenue under AS 37.10.050(a). (b) The permanent fund dividend of a former recipient of a public assistance program listed under (a) of this section may be taken under AS 43.23.140(b)(6) and 43.23.170 to satisfy the balance due on a defaulted overpayment claim. Sec. 47.05.085. Subpoena power. (a) The commissioner or the commissioner's designee at the director level may issue subpoenas to compel the production of books, papers, correspondence, memoranda, and other records considered necessary as evidence in connection with an investigation under or the administration of AS 47.07 (medical assistance), AS 47.08 (assistance for catastrophic illnesses and acute or chronic medical conditions), AS 47.25 (child care assistance, child care grants, general relief, adult public assistance, and food stamps), and AS 47.27 (Alaska temporary assistance program). (b) In case of refusal to obey a subpoena issued to any person under (a) of this section, the superior court may, upon application by the department, issue an order requiring the person to appear before the department to produce evidence if ordered. Failure to obey the order of the court is punishable as contempt. (c) A person who, without just cause, fails or refuses to produce books, papers, correspondence, memoranda, and other records, if it is in the person's power to do so, in obedience to a subpoena of the department or an authorized representative of it, upon conviction, is punishable by a fine of not more than $200, or by imprisonment for not more than 60 days, or by both. Each day the failure or refusal continues is a separate offense. Sec. 47.05.090. Authorization of the Interstate Compact on Adoption and Medical Assistance.