20 Miss. Code R. § 2-III
A Request for Resolution of Dispute must be filed with the MWCC within thirty (30) days following the payer's or provider's response to a request for reconsideration of any matter in dispute, or, in cases where the payer or provider fails to respond to a request for reconsideration, within thirty (30) days of the expiration of the time in which said response should have been provided. Failure to file a Request for Resolution of Dispute within this time shall bar any further action on the disputed issue(s) unless, for good cause shown, the MWCC or its Cost Containment Director extends the time for filing said request. In no event will a Request for Resolution of Dispute be considered by the Cost Containment Division if submitted more than one (1) year after the date of service. The decision to extend the time for filing a Request for Resolution of Dispute based on "good cause" shall be entirely at the discretion of the MWCC or its Cost Containment Director. Mere neglect will not constitute "good cause."
20 Miss. Code. R. § 2-III