15 Miss. Code. R. 9-91-9.2
Unless a hearing is held, if review by the State Department of Health concerning the issuance of a CON is not complete with a final decision issued by the State Health Officer within the time specified by rule or regulations, which shall not exceed ninety (90) calendar days from the filing of the application for a certificate of need, the proponent of the proposal may, within thirty (30) calendar days after the expiration of the specified time for review, commence such legal action as is necessary in the Chancery Court of the First Judicial District of Hinds County or in the Chancery Court of the county in which the service or facility is proposed to be provided to compel the Department to issue written findings and written order approving or disapproving the proposal in question.
15 Miss. Code. R. 9-91-9.2