State · IL
Medical billing services in Illinois
Short answer
Medical billing services in Illinois have to work with a Medicaid program that runs its managed care customers through HealthChoice Illinois plans, stopped accepting paper fee-for-service claims, and gives non-institutional providers 180 days from the date of service to file.
Commercial carriers are held to a 30-day payment clock under 215 ILCS 5/368a, and dual eligibles moved from MMAI to fully integrated dual eligible special needs plans on January 1, 2026. Remitwright assigns a dedicated biller who works IMPACT, MEDI, the MCO portals and the Department of Insurance rules, serving Illinois practices remotely. Rules for other states are on the medical billing services by state page.
Last reviewed by the Remitwright billing team. Editorial policy
Billing in Illinois: what's different
The rules below change how a claim is filed and paid in Illinois. Each line links to the official page it was read from, and the date at the top of this page is when it was last checked.
| Fact | In Illinois | Source |
|---|---|---|
| Medicaid program | Illinois MedicaidIllinois Department of Healthcare and Family Services (HFS) | 1 |
| Enrollment portal | IMPACT | 1 |
| Fee-for-service claims | MEDI (Medical Electronic Data Interchange) | 10 |
| Managed care plans | 10 plansAetna Better Health of Illinois, Blue Cross Community Health Plans, Meridian Health Plan, Molina Healthcare, CountyCare Health Plan, YouthCare, Aetna Medicare FIDE, Humana Dual Fully Integrated, Wellcare Meridian Dual Align, Molina Medicare Complete Care Plus | 4 |
| Medicaid timely filing (fee-for-service) | 180 days from the date of service | 5 |
| EVV | HHAeXchange is the state EVV vendor and aggregator | 9 |
Illinois Medicaid
Illinois Medicaid is run by the Illinois Department of Healthcare and Family Services (HFS). Provider enrollment goes through IMPACT1, at hfs.illinois.gov, and fee-for-service claims go through MEDI (Medical Electronic Data Interchange)10, at hfs.illinois.gov. HealthChoice Illinois (HCI) is the statewide Medicaid managed care program. HFS also runs YouthCare for former youth in care. The MMAI program for dual eligibles ended December 31, 2025, and its members moved to fully integrated dual eligible special needs plans on January 1, 20263. In FY 2022 HFS held contracts with five HCI plans, four statewide and one serving Cook County only.
Fee-for-service filing limit: 180 days from the date of service for non-institutional fee-for-service claims. The deadline applies to both initial and resubmitted claims5. Medicare crossover claims have two years from the date of service. Claims with third party liability are due within 180 days after the primary payer's final adjudication. A newly enrolled provider has 180 days from the enrollment date, and a replacement or void and rebill has 12 months from the original paid voucher date. HealthChoice Illinois plans set their own filing limits in their provider contracts, so read each plan's manual.
Managed care plans4
- Aetna Better Health of IllinoisHealthChoice Illinois, statewide
- Blue Cross Community Health PlansHealthChoice Illinois, statewide
- Meridian Health PlanHealthChoice Illinois, statewide
- Molina HealthcareHealthChoice Illinois, statewide
- CountyCare Health PlanHealthChoice Illinois, Cook County only
- YouthCareOnly for former youth in care and children of youth in care
- Aetna Medicare FIDEFully integrated dual eligible special needs plan, all counties
- Humana Dual Fully IntegratedFully integrated dual eligible special needs plan, all counties
- Wellcare Meridian Dual AlignFully integrated dual eligible special needs plan, all counties
- Molina Medicare Complete Care PlusFully integrated dual eligible special needs plan, all counties
Each plan is credentialed separately, has its own portal and its own appeal route. A practice that joins Illinois Medicaid through one plan is not in network with the others until each contract is in place.
Commercial payers and the prompt-pay law
The largest commercial payers in Illinois by reported market share7: Blue Cross and Blue Shield of Illinois (Health Care Service Corporation), UnitedHealthcare of Illinois, Health Alliance Medical Plans, Aetna, Celtic Insurance Company, Cigna Healthcare of Illinois. No two of them share a provider manual: filing windows, corrected-claim processes and appeal levels are set payer by payer, and the timely filing limits table lists verified deadlines, each with its source.
Clean-claim payment window under 215 ILCS 5/368a, Illinois Insurance Code, timely payment for health care services: 30 days6. Insurers, HMOs, managed care plans, PPOs and third party administrators must pay claims within 30 days after receipt of due written proof of loss. Late payments accrue interest at 9 percent per year from the 30th day, and the payer must tell you within 30 days of receipt if the documentation is insufficient. The practical use of the statute is in A/R follow-up: a clean claim past the statutory window is escalated with the statute cited, and interest is requested where the law provides it.
NEMT and home care in Illinois
Non-emergency medical transportation. Fee-for-service customers who are not enrolled in a managed care organization schedule rides through the state transportation broker, Transdev, at netspap.com or by phone. Managed care customers arrange transportation through their HealthChoice Illinois plan using the number on their membership card8. The split is decided at eligibility: a customer enrolled in a HealthChoice Illinois plan is that plan's transportation responsibility, and a fee-for-service customer belongs to Transdev. The NEMT billing in Illinois page covers trip documentation, broker claims and reconciliation.
Electronic visit verification. HHAeXchange is the state EVV vendor and aggregator. Illinois runs a hybrid model: an agency may use any qualified EVV vendor, but the visit data must still be submitted to HHAeXchange9. EVV applies to personal care services under six HCBS waivers and to home health care services under the State Plan. An agency using another vendor must be compatible with the EDI process to deliver visits to HHAeXchange. See home care billing in Illinois for waiver programs, EVV exceptions and authorizations.
Rules that change how Illinois claims are billed
Paper fee-for-service claims are no longer accepted10
For claims received on and after December 15, 2021, HFS returns paper claims and attachments unpaid. Submit fee-for-service claims through the MEDI portal or as X12 837P and 837I version 5010A transactions, and remember that a rejected batch still has to be rebuilt inside the 180-day filing window.
Revalidate in IMPACT every five years or lose enrollment11
HFS revalidates every provider at least once every five years and sends emails 90 and 30 days before the cycle ends. A provider who fails to revalidate is disenrolled, and reactivation cannot be made retroactive under federal regulations, so claims for the gap are not paid. Revalidation is completed in IMPACT through ILogin.
Non-emergency ground ambulance is carved out of HealthChoice Illinois12
For dates of service on and after January 1, 2022, non-emergency ground ambulance for HCI members was removed from the managed care contracts and became a fee-for-service benefit. Obtain prior approval through the state transportation broker's PassPORT portal or provider line, then submit the claim directly to HFS rather than the MCO. The notice lists A0426, A0428, A0433, A0434, A0425 and A0422 as the affected codes.
Telehealth coverage rules under Public Act 102-010413
Signed July 22, 2021, the act requires state-regulated health plans to cover telehealth services. Cost sharing for telehealth cannot exceed what the plan charges for the same service in person, the plan cannot require a prior in-person visit, and it cannot demand documentation of a barrier to in-person care. The Department of Insurance summary does not address payment rates, so confirm each payer's telehealth fee schedule before you bill.
Balance billing is split between Illinois law and the No Surprises Act14
Company Bulletin 2022-03 explains that 215 ILCS 5/356z.3a still governs PPO claims when care is delivered at a participating hospital or ambulatory surgical treatment center, the patient did not willfully choose the out-of-network provider, and the service is radiology, anesthesiology, pathology, neonatology or emergency department care. Those disputes go through the state negotiation and arbitration process instead of federal IDR. The federal act requires an initial payment or denial within 30 days of the bill, and self-funded plans fall under the federal rules.
Services for Illinois practices
Remitwright serves Illinois practices remotely, inside the practice management or EHR system the practice already uses. A dedicated biller works the account; nothing is pooled. Each service below explains what that biller does.
- Medical billingClaims worked by one named biller
- CredentialingEnrollment, CAQH and PECOS kept current
- Eligibility verificationCoverage and benefits checked before visits
- Prior authorizationAuths requested, tracked, attached to claims
- Denial managementEvery denial read, worked and appealed
- A/R follow-upUnpaid claims chased before filing limits
FAQ
Questions from Illinois practices
How long do we have to file an Illinois Medicaid claim?
Which HealthChoice Illinois plans do we need to be contracted with?
Can we still mail paper claims to HFS?
What is the Illinois prompt pay rule for commercial insurers?
Do we need EVV for our home care agency?
Our ambulance company used to bill the MCOs for non-emergency transports. What changed?
Which commercial payers matter most in Illinois?
How does a remote biller handle an Illinois practice?
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