What No Surprises Act and IDR deadlines should providers track in Mississippi?

Initial Payment or Notice of Denial in Mississippi: Payer must issue payment or notice of denial within 30 calendar days of clean claim receipt; Federal Open Negotiation Notice Submission (Mississippi): Initiating party must send compliant notice within 30 business days from receipt of payment or denial notice; Open Negotiation Period Duration (Mississippi): Strict 30 business days duration from open negotiation service date. Verify the trigger date, current agency notices, and any extension before acting.

Which agencies administer these rules in Mississippi?

The guide identifies Mississippi Insurance Department, Centers for Medicare & Medicaid Services (CMS) / CCIIO. The correct agency depends on the plan and claim jurisdiction.

No Surprises Act & State IDR Guides

Mississippi No Surprises Act & IDR Guide

Mississippi does not operate an independent state-level arbitration forum or specified state law for commercial out-of-network surprise medical billing. Under Miss. Code Ann. Title 83, out-of-network dispute resolution for emergency services, post-stabilization care, non-emergency services at in-network facilities, and air ambulance transports in Mississippi defaults directly to the Federal No Surprises Act (45 CFR § 149.510) Independent Dispute Resolution (IDR) process administered by CMS.

Accountability & Review

Reviewed by Millennova Legal Operational Integrity Team, Senior Audit and Arbitration Analysts

Last Reviewed

2026-09-14

Plain-language overview

Direct Federal Jurisdiction: Out-of-network balance billing disputes in Mississippi fall under the Federal No Surprises Act IDR process via CMS.

Start with plan jurisdiction, not the provider's location alone. Fully insured coverage may be governed by a specified state process, while self-funded employer plans commonly remain in the Federal Independent Dispute Resolution process. Confirm eligibility from the remittance, plan information, applicable state law, and current federal guidance before opening a dispute.

Which process applies in Mississippi?

Federal No Surprises Act Fallback

Because Mississippi has not enacted an alternative specified state dispute mechanism approved under 45 CFR § 149.30, both state-regulated commercial plans under Miss. Code Ann. Title 83 and federally regulated self-funded ERISA group health plans are adjudicated through the Federal IDR process.

ERISA And Commercial Scope

All comprehensive commercial coverage types in Mississippi—including individual market policies, small and large group employer plans, and self-insured health plans—utilize standard federal open negotiation and certified IDR entities.

Air Ambulance Scope

Air ambulance payment disputes arising in Mississippi are governed exclusively under federal No Surprises Act statutory standards and must be initiated through the federal IDR portal.

Open negotiation requirements

Federal Process

Providers and facilities in Mississippi must submit a compliant Open Negotiation Notice (CMS-10779) to the payer within 30 business days of receiving an initial payment or notice of denial. The parties must complete a mandatory 30-business-day open negotiation period before federal arbitration can be initiated.

State Process

Not applicable. Mississippi does not maintain an independent state-level conciliation or mediation process under Miss. Code Ann. Title 83 for commercial balance billing disputes.

Federal and state IDR procedure

Federal Dispute Forum

Disputes arising in Mississippi are initiated through the CMS Federal IDR Portal (nsa-idr.cms.gov). CMS assigns an approved Certified Independent Dispute Resolution Entity (CIDRE) to arbitrate the dispute.

Baseball Style Arbitration

Under federal law, the certified IDR entity conducts final-offer ("baseball-style") arbitration. The IDR entity evaluates the Qualifying Payment Amount (QPA), provider qualifications, patient acuity, facility market share, and demonstrative evidence to select either the provider or the payer final offer without compromise.

State Dispute Forum

No separate state dispute forum is maintained in Mississippi; Mississippi Insurance Department oversees insurer licensing under Miss. Code Ann. Title 83 and coordinates with CMS for provider-payer payment disputes.

No Surprises Act and IDR deadlines

Deadlines can depend on the trigger event and may be affected by agency relief notices. Confirm the live rule before filing.

Event	Timeframe
Initial Payment or Notice of Denial in Mississippi	Payer must issue payment or notice of denial within 30 calendar days of clean claim receipt
Federal Open Negotiation Notice Submission (Mississippi)	Initiating party must send compliant notice within 30 business days from receipt of payment or denial notice
Open Negotiation Period Duration (Mississippi)	Strict 30 business days duration from open negotiation service date
Federal IDR Initiation (Mississippi)	Must be filed in the CMS portal within 4 business days after open negotiation period ends

Documentation checklist

Copy of patient health insurance identification card front and back (establishing plan sponsor and ERISA vs. Mississippi state jurisdiction)
Itemized billing statement (CMS-1500 or UB-04) showing procedure codes, modifiers, and billed charges
Explanation of Benefits (EOB) or Electronic Remittance Advice (ERA) detailing initial payment amount, Qualifying Payment Amount (QPA), and CARC/RARC codes
Standard CMS Open Negotiation Notice Form (CMS-10779) with certified electronic delivery or certified mail delivery confirmation
Evidentiary submission demonstrating clinician training, board certification, facility teaching status, case complexity, and regional commercial rate data in Mississippi

Responsible agencies

Mississippi Insurance DepartmentMississippi Insurance Regulation & Market Conduct (Miss. Code Ann. Title 83)
Centers for Medicare & Medicaid Services (CMS) / CCIIOFederal No Surprises Act & IDR Portal Oversight

Primary legal and regulatory sources

Mississippi Code Annotated Title 83 (Insurance)Mississippi Insurance Oversight · Miss. Code Ann. Title 83
Mississippi Insurance Department Official PortalMississippi Insurance Department · State Insurance Regulator
45 CFR § 149.510 — Federal Independent Dispute Resolution ProcessU.S. Government Publishing Office / CMS · Current Federal Regulation

This operational reference is educational, is not legal advice, and does not create an attorney-client relationship.

Related forms and official resources

Common questions

Does Mississippi use state surprise-billing arbitration or Federal IDR?: Mississippi does not operate an independent state-level arbitration forum or specified state law for commercial out-of-network surprise medical billing. Under Miss. Code Ann. Title 83, out-of-network dispute resolution for emergency services, post-stabilization care, non-emergency services at in-network facilities, and air ambulance transports in Mississippi defaults directly to the Federal No Surprises Act (45 CFR § 149.510) Independent Dispute Resolution (IDR) process administered by CMS.
What No Surprises Act and IDR deadlines should providers track in Mississippi?: Initial Payment or Notice of Denial in Mississippi: Payer must issue payment or notice of denial within 30 calendar days of clean claim receipt; Federal Open Negotiation Notice Submission (Mississippi): Initiating party must send compliant notice within 30 business days from receipt of payment or denial notice; Open Negotiation Period Duration (Mississippi): Strict 30 business days duration from open negotiation service date. Verify the trigger date, current agency notices, and any extension before acting.
Which agencies administer these rules in Mississippi?: The guide identifies Mississippi Insurance Department, Centers for Medicare & Medicaid Services (CMS) / CCIIO. The correct agency depends on the plan and claim jurisdiction.