Medical Billing Services in Illinois
Illinois billing runs on three sets of rules: Wellpoint Federal for Medicare Part A and B, the Department of Healthcare and Family Services (HFS) for fee-for-service Medicaid, and the HealthChoice Illinois plans for most other Medicaid members. We handle the billing work for Illinois practices remotely across 15+ specialties.
Who Pays Medical Claims in Illinois
Where Illinois claims go, by payer type.
Jurisdiction 6
Illinois Part A and Part B claims go to Wellpoint Federal, the name National Government Services has used since April 1, 2026. It is the A/B MAC for Jurisdiction 6, which also covers Minnesota and Wisconsin. Home health and hospice claims are the exception: CMS assigns those to Palmetto GBA (Jurisdiction M). DME claims go to DME MAC Jurisdiction B, run by CGS Administrators.
Illinois Medicaid (HFS)
Run by the Illinois Department of Healthcare and Family Services. Providers enroll through the IMPACT system. Claims and eligibility checks go through HFS's MEDI system, which also shows whether a patient is enrolled in a HealthChoice plan.
HealthChoice Illinois
Most people with an HFS medical card must enroll in HealthChoice Illinois. HFS's enrollment site lists Aetna Better Health of Illinois, Blue Cross Community Health Plans, CountyCare (Cook County only), Meridian Health Plan and Molina Healthcare, plus YouthCare for former youth in care. Providers contract with each plan individually.
Plan rosters can change, so we confirm each patient's plan in MEDI. Commercial and Medicare Advantage plans are billed under their own contracts.
Illinois Medicaid Billing Rules to Know
From HFS provider guidance. The handbook changes, so check the current version before relying on a single deadline.
180 days from the date of service
For non-institutional claims with dates of service on or after July 1, 2012, HFS must receive the claim within 180 days of the date of service. That applies to first submissions and resubmissions. Medicare crossover claims and Medicare-denied claims get 2 years, and that includes patients whose primary coverage is a Medicare Advantage plan.
Situations that restart the clock
HFS counts a fresh 180 days from the date a new enrollment or update was entered on the provider file, from the date retroactive eligibility shows in the system (visible in MEDI), and from final adjudication by another payer. Several of these need an HFS 1624 override request attached to the claim.
Replacing or voiding a paid claim
A paid claim can be replaced or voided electronically within 12 months of the original paid voucher date. After a void and rebill, the new claim is timely only if received within 90 days of the void's DCN, otherwise a manual override is needed. Denied claims cannot be replaced this way.
Sources: HFS Timely Filing Claim Submittal for Non-Institutional Providers; HFS All Providers Handbook Supplement; HFS Handbook for Providers of Medical Services, Chapter 100; HFS HealthChoice Illinois pages; CMS Who Are the MACs.
What Makes Illinois Medical Billing Different
Three things we watch on Illinois accounts.
Why 180 days goes fast in Illinois
HFS gives fee-for-service claims 180 days from the date of service, against the 12 months Medicare allows. A claim that waits on a missing document or an eligibility problem can use that time up before anyone notices. New providers have a second trap: the IMPACT enrollment date is the date the application is submitted, and HFS does not pay for services before it. With a re-contracted plan roster on top of that, sending a claim to HFS for a patient who is actually in a HealthChoice plan (or the reverse) is an easy mistake.
What We Handle for Illinois Practices
Everything from the front-end check to the follow-up, for the Illinois payers above.
Eligibility checks in MEDI, including which HealthChoice plan the patient is in
Prior authorization requests and tracking, plan by plan
Medical coding and charge review
Claims to Wellpoint Federal, HFS, HealthChoice plans and commercial payers
Denial management, appeals and A/R follow-up
Payment posting, patient statements and monthly reporting
Specialties We Support in Illinois
15+ specialties served, including home health and hospice agencies, which bill a different Medicare contractor in Illinois.
Illinois Medical Billing Questions
Questions Illinois practices ask before they hand off billing.
Who processes Medicare claims in Illinois?
Wellpoint Federal, formerly National Government Services, processes Part A and Part B claims as the A/B MAC for Jurisdiction 6. Home health and hospice claims go to Palmetto GBA (Jurisdiction M), and DME claims go to CGS Administrators as DME MAC Jurisdiction B.
How long do I have to file an Illinois Medicaid claim?
For most non-institutional claims, 180 days from the date of service, resubmissions included. Medicare crossover and Medicare-denied claims have 2 years. Check the plan's own provider manual before assuming the HFS number applies to a HealthChoice claim.
How do I know whether a patient is in HealthChoice Illinois?
HFS tells providers to check eligibility in MEDI for the date of service. If the patient is in a plan, the claim goes to that plan instead of HFS, and your practice needs a contract with that plan.
Which specialties do you support for Illinois practices?
We support 15+ specialties, from behavioral health, laboratory and sleep medicine to home health, hospice, infusion, DME, dental, vision and ENT. Home health and hospice agencies should know they bill Palmetto GBA for Medicare rather than Wellpoint Federal.
Can Salyx RCM bill for my Illinois practice remotely?
Yes. We work remotely inside your practice management or billing software with secure access, so an Illinois practice keeps the system it already uses.
Find Out Where Illinois Claims Are Stalling
Start with a free billing audit: a review of your recent claims, denials and A/R, with a summary of what we found.