Wisconsin Medical Billing and Payer Rules

Timely Filing in Wisconsin

Wisconsin and the Federal No Surprises Act

CMS found that Wisconsin has no state law setting out-of-network rates, so the federal No Surprises Act process applies to insured and self-funded plans alike. We confirm the plan type before filing any dispute.

Major Payers

How Does Wisconsin Medicaid and BadgerCare Plus Work for Billing?

Wisconsin Medicaid is a joint federal and state program run by the Wisconsin Department of Health Services (DHS), and BadgerCare Plus is its full-coverage Medicaid program. DHS says the program serves more than 1 million residents and covers health care coverage and long-term care. The state administrative code calls the program medical assistance (MA), so you will see both names in manuals and on remittances.

Fee-for-Service and the ForwardHealth Portal

Fee-for-service means DHS pays the provider directly through its fiscal agent. Providers reach the program through the ForwardHealth portal, which carries the login for providers, fee schedules, the Wisconsin Administrative Code, online handbooks, ForwardHealth Updates, provider enrollment and a Provider Revalidation page.

Wis. Admin. Code DHS 106.03(1)(b) requires providers to use claim forms prescribed or furnished by the department. A provider may submit by electronic media only if the provider or its billing service is approved by the department, and a billing service must be approved in writing.

Managed Care

The ForwardHealth portal has its own Acute and Primary Managed Care area, which tells you that many members are enrolled in managed care plans rather than paid on fee-for-service. This page cites no current DHS list of contracted plans, so it does not name them. Before you bill, confirm the member's plan on the date of service. DHS 106.03(3)(b)4 shows why: a claim denied because of an incorrect HMO designation gets a longer resubmission window, covered in the next section.

Seek Payment from Medicare and Other Plans First

Medicaid pays last. Under DHS 106.03(7)(b), a provider must properly seek payment from Medicare or another health care plan before submitting a claim to MA for the same services, and under (7)(c) the provider must report the benefit amount paid on or with the bill, which reduces the MA payment. The code defines a health care plan broadly, including an HMO, a PPO and any other third party payer.

What Are the Timely Filing Limits in Wisconsin?

Wisconsin Medicaid requires the department's fiscal agent to receive a correct and complete claim within 365 days after the date of service. That is the rule in Wis. Admin. Code DHS 106.03(3)(b)1, and it comes with a stern consequence: the fiscal agent's response to a claim received after 365 days is final department action on that claim.

The code lists the only exceptions to that deadline in DHS 106.03(3)(c), plus a longer window in (3)(b)4. They matter because most late Medicaid claims we see fall into one of them. The table summarizes what we read in the code.

Two practical points follow from the code. First, the provider is responsible for follow-up: DHS 106.03(3)(b)2 says the provider must verify that correct payment was made and seek resolution of disputed claims. A claim that sat unremitted for a year is the provider's problem. Second, the code says the truthfulness, completeness, timeliness and accuracy of a claim are the provider's sole responsibility, even when a billing service or other agent submitted it (DHS 106.03(2)(c)).

Other Payers

Medicare timely filing is one calendar year after the date of service under 42 CFR 424.44. Commercial and managed care windows come from each contract and provider manual. This page cites no Wisconsin statute that sets a single commercial filing limit, so read the participation agreement for every payer you bill.

How Fast Must Wisconsin Medicaid Pay a Claim, and How Do You Contest the Amount?

DHS must pay at least 95 percent of properly completed claims within 30 days of receipt, at least 99 percent within 90 days and 100 percent within 180 days. That standard is in DHS 106.04(1)(a), and it is a target for the department as a whole, not a per-claim deadline you can sue on.

To contest the amount paid, notify the fiscal agent, request reconsideration and payment adjustment, and do it within the 365-day period. The response in writing identifies the basis for approving or denying the adjustment, and DHS 106.03(3)(b)5 says that response is final departmental action on the claim.

The formal hearing rules in DHS 106.12 do not cover this. That section governs actions such as decertification or suspension of a provider, and it says contests over the amount of payment, including claim denials, follow the DHS 106.03(3)(b)5 procedure. Hearings on overpayment recoveries are governed by DHS 108.02(9)(e). Check the ForwardHealth handbook pages on appeals for any form or address.

Who Is the Medicare Contractor in Wisconsin?

National Government Services, Inc. (NGS) is the Medicare Administrative Contractor (MAC) for Wisconsin Part A and Part B claims, in Jurisdiction 6. The CMS MACs-by-state list shows Illinois, Minnesota and Wisconsin together in J6. The same list assigns home health and hospice (HH+H) claims for Wisconsin to NGS.

Durable medical equipment follows a separate contractor. On the CMS list, DME MAC Jurisdiction B, which includes Wisconsin along with Illinois, Indiana, Kentucky, Michigan, Minnesota and Ohio, is CGS Administrators, LLC.

Medicare timely filing is 1 calendar year after the date of service, per 42 CFR 424.44. Wisconsin Medicaid requires you to seek Medicare payment first, so a late Medicare filing also affects your Medicaid claim. For the federal side, see our Medicare payer guide and Medicaid payer guide.

What Is Wisconsin's Prompt Payment Law for Insurers?

Wis. Stat. 628.46 says an insurer shall promptly pay every insurance claim, and a claim is overdue if not paid within 30 days after the insurer is furnished written notice of the fact of a covered loss and of the amount of the loss. All overdue payments bear simple interest at 7.5 percent per year.

Four details decide most disputes. A partial amount supported by written notice is overdue 30 days after that notice, and later parts of the claim run their own 30 days. Payment counts as made on the date the draft or equivalent instrument was mailed in a properly addressed, postpaid envelope, or the date of delivery if not mailed. A payment is not overdue when the insurer has reasonable proof it is not responsible. And under subsection (2), where the policy requires proof of loss, the claim is not overdue until 30 days after the insurer receives it.

The text of 628.46 does not define a clean claim or separate electronic from paper deadlines, and it counts from written notice with the amount of the loss. Keep clearinghouse acceptance reports as proof of the notice date. Subsection (2m) adds a separate 30-day rule for chiropractic services, and subsection (3) limits the section to the classes of claims listed in s. 646.31(2), so read that subsection.

Does Wisconsin Have Its Own Surprise Billing Law?

Wisconsin has no state law that sets out-of-network payment amounts, so the federal No Surprises Act (NSA) governs. CMS said so in its December 10, 2021 letter to Governor Evers and Commissioner Afable: Wisconsin has no applicable All-Payer Model Agreement and identified no state law governing the out-of-network rate. The federal independent dispute resolution (IDR) process therefore applies to services furnished to people in insured group health plans, or group or individual coverage, in Wisconsin.

The Office of the Commissioner of Insurance (OCI) also says the NSA applies to both self-insured employer plans and fully insured plans. See our state surprise billing laws page for how other states differ.

The 2021 CMS letter describes OCI as lacking authority to enforce several provisions. OCI's current page lists those provisions as ones it enforces, so the arrangement appears to have changed. Confirm with OCI before you rely on one agency or the other for a specific complaint.

Filing an NSA Complaint with OCI

OCI's form says you can file as an insured, a provider or another party, and that OCI sends a copy of the complaint to the insurance company or billing provider. The form says you can typically expect to hear from the company within about 25 days. It lists OCINSAComplaints@wisconsin.gov and the phone numbers 1-800-236-8517 within Wisconsin and 1-608-266-0103 outside it.

How Do You Dispute an Out-of-Network Underpayment in Wisconsin?

For an insured plan or a self-funded plan, an underpaid out-of-network emergency or facility-based claim in Wisconsin follows the federal path: open negotiation first, then federal IDR if the parties do not agree. Our out-of-network billing and IDR service page covers the steps and day counts.

Scope comes first. Per OCI, the NSA covers out-of-network emergency services, air ambulance, and non-emergency services by an out-of-network provider at an in-network facility, but not ground ambulance. Check the initial payment or denial notice date, send the open negotiation notice with proof of delivery, and pay the required IDR fees on time. Wisconsin has no state step to insert in between.

Which Payers Matter Most in Wisconsin?

We cannot rank Wisconsin payers by market share, because the OCI market share reports we found cover life and property lines and not health, so this page names payers only from OCI's current list of 2026 comprehensive health rate filings. That list covers the individual and small group markets and is not a complete list of every payer or Medicare Advantage plan you will bill.

The filers include BCBS of Wisconsin and Compcare Health Services Insurance Corporation (both shown as Anthem BCBS), UnitedHealthcare of Wisconsin, Wisconsin Physicians Service Insurance Corporation, Aspirus Health Plan, CareSource (Common Ground Healthcare Cooperative), Dean Health Plan, Group Health Cooperative of Eau Claire and of South Central Wisconsin, HealthPartners, Medica, Medical Associates Health Plans, MercyCare HMO, Molina Healthcare of Wisconsin, Network Health Plan, Quartz Health Benefit Plans, Security Health Plan of Wisconsin and National Health Insurance Company. Medicare is NGS.

Our payer guides cover Anthem and Molina Healthcare in more detail. Each plan has its own provider manual, filing window and appeal route, so build a payer grid for your own contracts and check it each quarter.

What Else Affects Wisconsin Billing Offices?

Wisconsin MA gives providers a particular responsibility for non-covered services. DHS 106.02(6) says that if a provider decides a non-covered service is necessary, it may furnish the service if, before rendering it, the provider advises the recipient that the service is not covered and that the recipient is responsible for payment.

DHS 106.02(3) and (5) also set conditions for payment: the recipient must have been eligible on the date of service, and the service must be appropriate and medically necessary for the recipient's condition. Our hospital and facility billing page covers institutional claims, and our emergency medicine billing page covers the specialty most affected by the NSA.

Neighbouring states differ on nearly every point above. Compare Minnesota, Illinois and Michigan if you bill across the border.

How We Handle Billing in Wisconsin

For a Wisconsin account we sort claims by clock: Medicaid at 365 days with the 455-day and 90-day exceptions tracked, Medicare at one calendar year, and commercial plans by contract. Claims go out within 24 hours of charge entry, and denials are worked within 48 hours. We check eligibility and the member's plan on the date of service before a claim is built.

For underpaid out-of-network claims we run open negotiation and federal IDR, with deadline tracking and documentation checks. Book a call and we will review your Wisconsin payer mix first.