In Mississippi, only the treating provider can open the fast track

The physician who denied owes you the reasons

Mississippi provides that no determination adverse to a patient or an affected provider may be made on the necessity or justification for care without prior evaluation and concurrence by a physician licensed in Mississippi. That physician must then discuss the reasons for the determination with the affected provider on request, within seven calendar days of being notified of the request.

Where a determination may result in a denial of third-party reimbursement or of precertification, it must include the evaluation, findings and concurrence of a physician trained in the relevant specialty or subspecialty — if the patient's physician asks for that.

The certification that opens the expedited track

Mississippi places the decision about urgency with the clinician. Expedited external review is available only if the patient's treating health care provider certifies that adhering to the standard timeframe would seriously jeopardise the life or health of the covered person, or would jeopardise their ability to regain maximum function. Once certified, the review must be completed within 72 hours.

Four months, filed with the Department

The request form goes to the Mississippi Insurance Department within four months after you receive, from the insurer, a denial of payment on a claim or of a request for coverage of a health care service or course of treatment. External review is open to anyone who has received a final denial of that kind.

• Office of the Insurance Commissioner, Mississippi Insurance Department.
• Attn: Life and Health Actuarial Division, P.O. Box 79, Jackson, MS 39205.
• The Department publishes the external review request form as Appendix B to its Rule 15.22.

What the reviewers may decide

The right applies where the decision involved a judgement about the medical necessity, appropriateness, health care setting, level of care, or effectiveness of the service or treatment requested. The reviewers are health care professionals with no association with the insurer, which is the point of the exercise: the same clinical question, put to someone with nothing at stake in the answer.

How long it takes

• Standard external review: up to 45 days from the date the Department receives the request.
• Expedited external review: completed within 72 hours, once the provider's certification is in.

How to file

1. 1

   Get the final denial

   External review follows a final denial of payment or of a requested service or course of treatment.

2. 2

   Complete the Department's form

   The external review application is published by the Department as Appendix B to Rule 15.22.

3. 3

   Add the provider certification if urgent

   Only the treating provider's certification opens the 72-hour track; without it the case runs on the 45-day standard timetable.

4. 4

   Mail it to the Life and Health Actuarial Division

   Office of the Insurance Commissioner, Mississippi Insurance Department, P.O. Box 79, Jackson, MS 39205.

The rules the denial itself had to follow

Before a denial reaches external review it has to have been made under Mississippi's own standards for utilization review agents, which the Department publishes as regulation and updates — the current version dates from January 2025, with related provisions in Title 19, Part 3, Chapter 19. Those standards govern who may make an adverse determination and how, which makes them worth reading alongside the clinical argument: a determination made outside them is vulnerable on procedure as well as on medicine.

• Minimum Standards for Utilization Review Agents — the Department's regulation, current version January 2025.
• Title 19, Part 3, Chapter 19 of the Department's regulations carries the related requirements.
• The external review request form is Appendix B to Rule 15.22.

For Mississippi practices

The operational consequence is that the practice, not the patient, controls whether a case moves quickly. A patient can describe how bad things are; only the treating provider can certify it in the terms the statute uses. Where a delay would genuinely jeopardise life, health or the ability to regain function, writing that certification at the same time as the appeal narrative is what converts a 45-day process into a 72-hour one.