Missouri Medical Billing and Payer Rules
MO HealthNet fee-for-service claims must reach the state within 12 months of the date of service, WPS processes Medicare Part A and B in Jurisdiction 5, and Missouri has its own arbitration law for out-of-network professionals at in-network facilities.
Written by Salman Saeed, CEO and Co-Founder · Reviewed by a Certified Medical Coder · Last reviewed October 2026In short: insurers in Missouri owe one percent interest per month plus a one percent daily penalty if a claim is unpaid after the forty-fifth processing day. MO HealthNet allows 12 months to file, Medicare allows one calendar year, and RSMo 376.690 sends out-of-network disputes at in-network facilities to a 60-day negotiation and then arbitration.
Timely Filing in Missouri
| Payer | Filing limit | Source |
|---|---|---|
| MO HealthNet fee-for-service | 12 months from the date of service | 13 CSR 70-3.100(3) |
| MO HealthNet resubmission after a timely denial | 24 months from the date of service | 13 CSR 70-3.100(4) |
| MO HealthNet adjustment to a paid claim | 24 months from the date of service | 13 CSR 70-3.100(6) |
| Medicare (WPS) | 1 calendar year after the date of service | 42 CFR 424.44 |
| Commercial plan, nonparticipating provider | Up to one year from the date of service | RSMo 376.384.1(1) |
| Commercial plan, participating provider | Up to six months unless the contract differs | RSMo 376.384.1(2) |
| Medicaid managed care plans | Set by each plan contract | Plan provider manual |
Missouri Law and the Federal No Surprises Act
Missouri has a surprise billing law, RSMo 376.690, that CMS treats as a specified state law for unanticipated out-of-network care at in-network facilities. Federal IDR covers the rest, and self-funded plans stay with the federal process. We confirm plan type and facility status before filing either notice.
Major Payers
How Does MO HealthNet Work for Billing?
Missouri's Medicaid program is called MO HealthNet, and the Missouri Department of Social Services (DSS) runs it through the MO HealthNet Division. The division publishes the provider manuals that the claim-filing rule, 13 CSR 70-3.100, incorporates by reference.
Most members are in managed care, but not all. DSS lists three general MO HealthNet Managed Care health plans: United Healthcare, Healthy Blue and Home State Health. Home State Health also manages Show Me Healthy Kids, the plan for Missouri children in the care and custody of DSS. DSS says every plan must provide the same benefits, and that the biggest difference is which doctors work with each plan.
Who Stays in Fee-for-Service?
DSS says some members get care through the MO HealthNet fee-for-service program instead of a managed care organization. Its exempt list includes MO HealthNet for People with Disabilities, for the Blind and Visually Impaired, and for Seniors, and anyone who has Medicare coverage.
A fee-for-service claim goes to the state through eMOMED, and a managed care claim goes to the plan under its own manual and contract. We check which applies on the date of service.
How Do You Bill MO HealthNet Through eMOMED?
eMOMED is the MO HealthNet web portal at emomed.com, and fee-for-service claims, eligibility checks and remittance advices all run through it. The division's 2022 eMOMED overview also lists attachments, prior authorization status, provider communications, file management and enrollment status.
What Can You Do with a Claim in eMOMED?
- New Crossover Claim, for Medicare-primary members.
- Search Claim, by ICN or with the advanced search.
- Void and Replacement: the overview says void is only for a claim the provider never meant to submit or one a MO HealthNet representative advised voiding, and replacement adjusts a paid claim.
- Timely Filing, which adjusts a denied claim up to 24 months from the date of service when the first claim went in within 12 months.
- Copy Claim Original, and Copy Claim Advanced, which also lets you change the claim form and the billing NPI.
To check eligibility you enter the participant's DCN and a current or past date of service. The file management function holds remittance advices for two months, and payment information shows direct deposit details for the last two billing cycles.
For claim questions, the overview says Provider Communications responds to portal messages within 48 hours. Its phone is (573) 751-2896, and the eMOMED Technical Help Desk is (573) 635-3559. We pull remittance advices well inside the two-month window.
What Are the Timely Filing Limits in Missouri?
MO HealthNet fee-for-service claims must be filed by the provider and received by the state within 12 months of the date of service. That is the rule in 13 CSR 70-3.100(3), and the count begins with the date of service and ends with the date of receipt.
| Payer or situation | Limit | Source |
|---|---|---|
| MO HealthNet fee-for-service, original claim | 12 months from the date of service to the date the state receives it | 13 CSR 70-3.100(3) |
| Claim first filed with Medicare, then sent to MO HealthNet | 12 months from the date of service, or 6 months from the date on Medicare's notice of the allowed claim | 13 CSR 70-3.100(3)(A) |
| Claim denied by Medicare | 12 months from the date of service | 13 CSR 70-3.100(3)(A) |
| Resubmission of a claim first received on time, then denied or returned | 24 months from the date of service | 13 CSR 70-3.100(4) |
| Adjustment to a paid MO HealthNet claim | 24 months from the date of service | 13 CSR 70-3.100(6) |
| Claim denied because of state agency error or delay | Tell the state within 6 months of the remittance advice date, or 12 months from the date of service, whichever is longer | 13 CSR 70-3.100(5) |
| Medicare Part A and B (WPS) | 1 calendar year after the date of service | 42 CFR 424.44(a)(1) |
| Commercial plan, nonparticipating provider | Up to one year from the date of service | RSMo 376.384.1(1) |
| Commercial plan, participating provider | Up to six months from the date of service, unless the contract sets a different standard | RSMo 376.384.1(2) |
Medicare/Medicaid crossover claims needing a separate MO HealthNet claim must go electronically with the Medicare internal control or claim identification number. Paper crossovers are not processed.
A fee-for-service member is seen on March 3, 2026. The original claim must reach MO HealthNet by March 3, 2027. If that claim was received on time and then denied, a resubmission must reach the state by March 3, 2028. A commercial plan that treats you as participating can set a window as short as six months by contract, so we work to the earliest date.
Who Is the Medicare Contractor in Missouri?
Wisconsin Physicians Service Government Health Administrators (WPS GHA) is the Medicare Part A and Part B MAC for Missouri, in Jurisdiction 5 (J5). The CMS list of MACs shows J5 covering Iowa, Kansas, Missouri and Nebraska. Under 42 CFR 424.44(a)(1), a Medicare claim must be filed no later than the close of the period ending 1 calendar year after the date of service.
The same CMS list assigns Missouri durable medical equipment claims to Noridian in DME MAC Jurisdiction D, and home health and hospice claims to CGS Administrators in Jurisdiction 15. See our Medicare payer guide for detail.
What Is Missouri's Prompt Payment Law?
Missouri's prompt pay law is RSMo 376.383 and 376.384, and it sets a 45-processing-day deadline with interest and a daily penalty after that. Under 376.383.6, if a health carrier has not paid on or before the forty-fifth processing day from receipt, it owes one percent interest per month and a penalty equal to one percent of the claim per day.
The Clock, Step by Step
Processing days count only while the carrier holds the claim, and exclude days spent waiting for a response to its request for additional information (376.383.1).
How Much Is the Interest and Penalty?
The interest is one percent per month and the penalty is one percent of the claim per day, both calculated on the unpaid balance as of the forty-fifth processing day. For balances above $35,000, interest and penalty run for a maximum of 100 days, and interest is then two percent per month. The statute says interest and penalty come with the late payment without a second claim.
A carrier has a clean claim for $4,000 and the forty-fifth processing day passes unpaid. The penalty is one percent of $4,000, or $40 per day. If payment goes out 10 days later, the penalty is $400, and interest at one percent per month on the $4,000 balance adds to that.
A claim properly denied before day 45 owes no interest or penalty. If it is later approved on appeal, they start on the date of the first appeal, and in a court case run no more than 100 days from it, plus ten days after judgment (376.383.6(2)). We file the first appeal in writing and keep the date.
Who Is Covered?
DCI has jurisdiction over fully insured plans, which since March 1, 2010 must print Fully Insured on the ID card under 20 CSR 100-1.070. DCI's provider page also says the prompt pay law does not apply to self-insured employer plans, Medicare or MO HealthNet, so we do not plan collections around 376.383 interest on self-funded plans.
Under 376.384.2, a non-electronic claim is not subject to section 376.383. Under 376.384.3, DCI monitors compliance and may assess an administrative penalty of up to $25 per claim, capped at $250,000 a year per carrier.
Does Missouri Have Its Own Surprise Billing Law?
Yes. RSMo 376.690 covers unanticipated out-of-network care, and the federal CMS letter to Missouri names it a specified state law that sets the out-of-network rate in that situation. Missouri does not have an All-Payer Model Agreement, per the same letter, and the federal No Surprises Act (NSA) fills in everything 376.690 does not reach.
The CMS letter of December 23, 2021 says the federal IDR process under 45 CFR 149.510 applies to nonparticipating providers and emergency facilities that 376.690 does not reach. See our state surprise billing laws guide for how the other states compare.
What Does the Arbitration Actually Look Like?
To start arbitration, either the carrier or the professional must give written notice to the DCI director and the other party within 120 days of the end of the negotiation period, stating the billed amount and the date and amount of each party's final offer. The director randomly selects an arbitrator, the cost is shared equally, and the decision is binding. The patient does not take part.
Can a Missouri Out-of-Network Professional Balance Bill?
Not for unanticipated out-of-network care. Subsection 2(6) of 376.690 bars billing the patient the difference between the determined reimbursement and billed charges, and subsection 3 limits the patient bill to in-network cost sharing.
How Do You Dispute an Out-of-Network Underpayment in Missouri?
The path depends on the plan and the service. For an insured plan and an out-of-network professional at an in-network facility, use the 376.690 sequence. Everything else, including self-funded plans, uses open negotiation and federal IDR.
An out-of-network emergency physician treats a patient at an in-network hospital on March 2, 2026. The claim is due by August 29, 2026, counting 180 calendar days. Suppose the carrier makes its offer on May 4, 2026. The 60-day negotiation then ends July 3, 2026, and written notice of arbitration is due by October 31, 2026, counting 120 calendar days. Our out-of-network billing and IDR team tracks each date.
Which Payers Matter Most in Missouri?
The DCI 2023 Health Insurance Market Report says the largest four insurers controlled 85 percent or more of each major medical market. Its premium tables name Elevance Health (formerly Anthem), Blue Cross and Blue Shield of Kansas City, UnitedHealth Group, Cigna, Centene in the individual market, Cox, Humana, Medica, Oscar and a CVS group. It also says self-insured employers covered 30 percent of Missourians in 2023, so plan-type checks come first.
Payer detail is in our Anthem and UnitedHealthcare guides, and the Illinois, Iowa and Kansas pages cover neighboring rules.
What Else Affects Missouri Billing Offices?
Three items are worth building into your process. The first is the DCI provider complaint route for late commercial payments. Contact the carrier first, then mail or fax a Provider Complaint Form to the DCI Division of Consumer Affairs, P.O. Box 690, Jefferson City, MO 65102-0690, fax 573-526-4898, with a separate form for each patient and copies of your calls and letters. DCI says carriers have 20 days to respond.
The second is the Medicaid crossover rule: paper crossovers are not processed. The third is the claim form itself. Under 13 CSR 70-3.100(1), outpatient and inpatient hospital claims use the UB-04 CMS-1450 or electronic submission, and professional claims use the CMS-1500 (02-12) or electronic submission. See our hospital and facility billing and emergency medicine billing pages for the facility side.
How We Handle Billing in Missouri
We run each Missouri account on three clocks: 12 months for MO HealthNet fee-for-service, the plan contract for managed care and commercial claims, and one calendar year for Medicare. Claims go out within 24 hours of charge entry and denials are worked within 48 hours.
On out-of-network work, we sort each claim into the 376.690 sequence or federal IDR, record the carrier's offer date, and calendar the 60-day and 120-day marks. Plan-type and facility checks come first. Book a call and we will review your Missouri payer mix with you.
- RSMo 376.383, Health care claims for reimbursement (prompt pay) · Missouri Revisor of Statutes
- RSMo 376.384, Reimbursement of claims, duties of health carriers · Missouri Revisor of Statutes
- RSMo 376.690, Unanticipated out-of-network care · Missouri Revisor of Statutes
- 13 CSR 70-3.100, Filing of Claims, MO HealthNet Program · Missouri Secretary of State
- MO HealthNet eMOMED Overview (August 2022) · Missouri Department of Social Services
- Managed Care Plan Basics Frequently Asked Questions · Missouri Department of Social Services
- Health Care Providers, Complaint Process · Missouri Department of Commerce and Insurance
- 2023 Health Insurance Market Report · Missouri Department of Commerce and Insurance
- CMS enforcement letter to Missouri on the No Surprises Act, December 23, 2021 · CMS
- Medicare Administrative Contractors by state · CMS
- 42 CFR 424.44, Time limits for filing claims · eCFR
We check every rule, code and deadline against the official source. See our editorial policy.
Common Questions
Straight answers from the team that does the work.
Ask a billing lead directly. A 20-minute call, Monday to Friday, 9am to 5pm Eastern.
01What is the timely filing limit for Missouri Medicaid claims and how does it differ for managed care plans?
Under 13 CSR 70-3.100, MO HealthNet fee-for-service claims must reach the state within 12 months of the date of service, and a timely denied claim can be resubmitted up to 24 months. Managed care claims follow each health plan's contract, so check the plan first.
02Who is the Medicare MAC for Missouri, and which jurisdiction is it?
Wisconsin Physicians Service Government Health Administrators is the Part A and Part B Medicare Administrative Contractor for Missouri, in Jurisdiction 5, per the CMS list of MACs. J5 also covers Iowa, Kansas and Nebraska. Medicare claims are due within one calendar year of service (42 CFR 424.44).
03Does Missouri have its own surprise billing law, or do out-of-network disputes go to federal IDR?
Both apply. RSMo 376.690 covers out-of-network professionals who treat patients at in-network facilities, with a 60-day negotiation and then binding arbitration through DCI. The CMS letter says federal IDR applies to services that 376.690 does not reach, such as nonparticipating emergency facilities and air ambulance.
04How do I file a billing complaint with the Missouri Department of Commerce and Insurance?
Contact the carrier first, then mail or fax a Provider Complaint Form to the DCI Division of Consumer Affairs, P.O. Box 690, Jefferson City, MO 65102-0690, fax 573-526-4898, with one form per patient and your records of contact. DCI says carriers have 20 days to respond. DCI does not cover self-insured plans, Medicare or MO HealthNet.
05What is the prompt payment rule for insurers in Missouri and what interest applies when a claim is paid late?
RSMo 376.383 requires payment on or before the forty-fifth processing day. After that, the carrier owes one percent interest per month plus a penalty of one percent of the claim per day. For balances above $35,000, interest and penalty run a maximum of 100 days, then interest is two percent per month.
06Which commercial payers matter most for a hospital or ER group in Missouri?
The DCI 2023 market report says the four largest insurers held 85 percent or more of each major medical market. Names in its tables include Elevance Health (formerly Anthem), Blue Cross and Blue Shield of Kansas City, UnitedHealth Group and Cigna. Medicaid managed care runs through Healthy Blue, United Healthcare and Home State Health.
07Can an out-of-network ER physician group in Missouri balance bill a patient for emergency care?
Not for unanticipated out-of-network care under RSMo 376.690. A professional who treats a patient at an in-network facility and sends the claim to the carrier may bill the patient only in-network cost sharing, not the difference from billed charges. Other situations fall under the federal No Surprises Act.
08How should a Missouri hospital bill UB-04 claims to Medicaid compared with Medicare?
MO HealthNet takes inpatient and outpatient hospital claims on the UB-04 CMS-1450 or electronically within 12 months of the date of service. Medicare claims go to WPS in J5 within one calendar year. Medicare-primary crossovers to MO HealthNet must go electronically, not on paper.
09What steps do I follow to dispute an out-of-network underpayment in Missouri?
Check plan type first. For insured plans with in-network facility care, send the claim within 180 days, log the carrier's offer, negotiate for 60 days, then send written arbitration notice to the DCI director within 120 days. For self-funded plans and services outside 376.690, use open negotiation and federal IDR.
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