Confidentiality; audit; determination or redetermination of assessment.

(a) Unless otherwise provided by law or necessary to carry out the provisions of this chapter, proprietary information submitted by a nursing facility under this chapter is confidential and shall not be disclosed by the Mayor.

(b) The Mayor may audit the information required to be reported by a nursing facility under this chapter, or any rules issued pursuant to § 47-1267 , and may use the audited information to determine or redetermine the amount of the assessment due under this chapter.

(c) The Mayor may summon any person to appear before the Mayor to give testimony or answer interrogatories, or to produce books, records, or other pertinent information relating to matters subject to an audit. The summons may be served by a member of the Metropolitan Police Department or by registered mail or certified mail addressed to the person at the person’s last dwelling place or principal place of business. A verified return by the person serving the summons, or, in the case of service by registered or certified mail, the return post office receipt signed by the person served, shall be proof of service.