EDI registration and testing required to prepare for new Provider Portal The Mississippi Division of Medicaid (DOM) is in the process of implementing a new Medicaid Management Information System (MMIS) – which will include a new Provider Portal – known as MESA: Medicaid Enterprise System Assistance. The new system, going live at the beginning of October, is being developed by … Continue reading IMMEDIATE ACTION REQUIRED: Medicaid Providers must follow instructions for EDI registration and testing to prepare for new Provider Portal