Oregon Revised Statutes Public Health and Safety § 444.160

(1) Keep a correct account of the medicine, treatment, nursing and maintenance furnished to the patient, and set forth therein the actual, reasonable and necessary cost thereof.

(2) Make and file monthly with the judge exercising jurisdiction under ORS 419B.100 or 419C.005 of the county from which the patient was committed, an itemized, sworn statement, as far as possible, of the expense incurred at the hospital other than the free surgical and medical treatment as provided in ORS 444.120.