What is prior authorization?
Prior authorization (PA) means the health plan must approve certain care before it will cover it. Doctors or hospitals often submit PA for you, but you still have rights if PA is denied.
A PA denial is different from a bill denial after care already happened. With PA, the fight is usually about whether the plan will allow the treatment at all.
Overview for any state: Prior authorizations. This page is Mississippi-only.
Confirm plan type: Mississippi: Start Here.
Mississippi PA rules
The Mississippi Prior Authorization Reform Act (SB 2140, 2024 Regular Session, effective July 1, 2024) is codified at Miss. Code Ann. §§ 83-5-901 et seq.. It applies to health insurance issuers and health benefit plans in Mississippi, including Medicaid managed care and the state employee plan, but not to self-funded ERISA employer plans.
Standard (non-urgent) prior authorization
- Approval or adverse determination within 5 calendar days after the issuer has all necessary information (Act § 7)
- Pharmacy/drug PA: also subject to 2 business days under Miss. Code Ann. § 83-9-6.3 when using the standardized prior authorization form
- Issuers must post a complete PA list and clinical criteria on their website (Act § 5)
- Cannot deny a claim for missing PA if the PA requirement was not in effect on the date of service ( Act § 5(4))
Urgent prior authorization
- Decision within 24 hours after the issuer has all information needed (Act § 8), unless federal law requires a longer minimum timeframe
- Issuer must provide clinical staff access for urgent PA decisions (Act § 8(2))
Deemed authorization if the issuer is late
Failure to meet PA deadlines and other Act requirements means the service is automatically deemed authorized (Act § 17).
Denials, appeals, and reviewer qualifications
- Adverse determinations must be made by qualified physicians; denials must include reasons, criteria, and appeal instructions (Act §§ 9–10)
- PA appeals reviewed by a board-certified physician in the relevant specialty who did not make the original denial ( Act § 11)
- Cannot retroactively revoke a valid PA except in limited circumstances (Act § 13)
How long approvals last
- General approvals: at least 6 months (Act § 14)
- Chronic or maintenance care: at least 12 months (Act § 15)
- New plan must honor prior issuer PA for at least 90 days when documented (Act § 16)
Electronic PA
Issuers had to offer a standardized electronic PA process by January 1, 2025; providers must use it by January 1, 2027 (Act § 6). MID may fine issuers up to $10,000 per violation (Act § 18).
Where to look up PA rules
Each carrier publishes PA lists on its website (required by Mississippi law). Use your denial letter first—it should list how to appeal.
Carrier links: Mississippi prior auth & internal appeals links.
Medicaid / MS CAN
The Prior Authorization Reform Act explicitly includes Mississippi Medicaid managed care (MS CAN) and state employee coverage. MCOs such as Magnolia Health, Molina, and UnitedHealthcare Community Plan follow these deadlines in addition to federal Medicaid rules.
Service denials also use MCO grievance and appeal processes before a Division of Medicaid fair hearing—see Mississippi internal appeals.
If PA is denied
- Read the denial for reasons, criteria, and the appeal deadline.
- Ask the treating clinician for a letter of medical necessity and records.
- File an internal appeal (grievance) with the plan.
- If internal appeal fails, consider MID external review within 4 months.
Next: Mississippi internal appeals.
Urgent care
Ask the provider to request urgent PA and explain why delay would jeopardize life, health, or function. The issuer must decide within 24 hours. If denied, request an expedited internal appeal and, if needed, call MID at 601-359-3569 before sending an expedited external review request.
Emergency services are not subject to prior authorization under the Act's definition of urgent vs. emergency care.