MedicaidAdministrativeHigh impact
Update: Processing Medicare Crossover Claims
Mississippi Medicaid (DOM)·MS·Claims & Billing
Effective date
Oct 3, 2022
We identified it
Jun 21, 2026
Summary
Mississippi Medicaid has transitioned to a new provider portal system called MESA (Medicaid Enterprise System Assistance) for all claims submission, prior authorization requests, and provider functions. All Mississippi providers must use this new portal to submit, adjust, and correct Medicaid claims, access remittance advice, and verify member eligibility.
Action Required
Immediately: All Mississippi providers must register for and begin using the new MESA provider portal for all Medicaid functions. Billing team must complete portal registration, learn new claims submission processes for crossover claims, and update workflow procedures to use MESA for all claim submissions, adjustments, prior authorizations, and eligibility verification. The old Medicaid portal is no longer functional.