Medical Billing Services in Illinois
Billing, coding, credentialing and denial management for Illinois practices, with Medicare claims through National Government Services (Jurisdiction J6) and Illinois Medicaid handled by people who know the rules.
Medical billing for Illinois practices
Illinois practices bill one of the larger Medicaid programs in the Midwest. Most members are enrolled in HealthChoice Illinois managed care, and Cook County adds CountyCare to the plan list. Chicago area practices juggle Blue Cross and Blue Shield of Illinois, a busy Medicare Advantage market and several Medicaid plans, while downstate and rural clinics depend more on traditional Medicare and Medicaid fee-for-service.
SFA Solutions works with Illinois practices remotely. We bill Medicare Part B through National Government Services, keep your IMPACT enrollment and MCO participation in order, and work denials across all HealthChoice Illinois plans. With a 180 day Medicaid filing limit, we submit most clean claims within 24 hours and work rejections daily to keep claims well inside it.
Illinois at a glance
| Medicare contractor | National Government Services, Jurisdiction J6 |
|---|---|
| Medicaid timely filing | 180 days from the date of service for non-institutional fee-for-service claims; Medicare crossover claims within 2 years of the date of service |
| NP practice authority | Reduced |
| Cities we serve | Chicago, Aurora, Naperville, Joliet, Rockford, Springfield, Elgin, Peoria, Champaign, Waukegan |
What Illinois billing involves
These are the programs and rules our team works with for Illinois claims.
Medicare
National Government Services · J6Illinois Part B claims are processed by National Government Services in Jurisdiction J6. Medicare's filing limit is 12 months from the date of service, and appeals start with a redetermination within 120 days of the initial decision.
Illinois Medicaid
Illinois Medicaid, administered by the Department of Healthcare and Family Services (HFS); HealthChoice Illinois managed care; All Kids for children
Portal: IMPACT (Illinois Medicaid Program Advanced Cloud Technology) for provider enrollment; HFS processes fee-for-service claims directly through its MEDI system
Medicaid managed care
Current HealthChoice Illinois plans include Aetna Better Health of Illinois, Blue Cross Community Health Plans, Meridian, Molina and CountyCare (Cook County only). On June 8, 2026, HFS awarded new HealthChoice Illinois contracts to Aetna, Blue Cross and Blue Shield of Illinois, Humana, Meridian, Molina and CountyCare, so check HFS notices for when the new contracts take effect.
Timely filing
180 days from the date of service for non-institutional fee-for-service claims; Medicare crossover claims within 2 years of the date of service.
Commercial and Medicare Advantage
Blue Cross and Blue Shield of Illinois holds the largest commercial share, followed by UnitedHealthcare, Aetna and Cigna. Humana, UnitedHealthcare and Aetna lead Medicare Advantage enrollment.
Prompt pay law
Under 215 ILCS 5/368a, insurers must pay health care claims within 30 days after receiving due written proof of loss and must notify the provider of missing documentation within 30 days. Late payments carry 9% annual interest.
Nurse practitioners
Reduced practiceIllinois NPs need a written collaborative agreement with a physician until they complete 4,000 clinical hours and 250 hours of continuing education and file for full practice authority. Payers may ask for the collaborative agreement or FPA attestation during credentialing, so keep both on file.
Credentialing
Every provider who treats Illinois Medicaid members, including those who bill only MCOs, must be enrolled in IMPACT, and plans check that enrollment before loading you. Each HealthChoice Illinois plan then credentials separately. Blue Cross and Blue Shield of Illinois and most commercial carriers pull from CAQH ProView, so attest every 120 days.
Billing challenges Illinois practices face
A 180 day Medicaid window
Illinois Medicaid gives you 180 days from the date of service for professional claims. Rejections from eligibility or IMPACT enrollment mismatches eat into that window quickly. We work rejections promptly and track open claims against their deadlines.
Multiple Medicaid plans in Cook County
Chicago practices may see patients from five or more Medicaid plans, each with its own prior authorization lists and payment policies. A plan change at the start of the month can turn a clean claim into a denial. We verify plan assignment before each visit.
IMPACT enrollment details
MCOs match claims to the provider's IMPACT record, including NPI, taxonomy and service location. A missing location or outdated affiliation will cause denials even when the plan contract is active. We audit IMPACT records when we onboard your practice.
Our services in Illinois
Medical Billing
Learn moreCredentialing & Payer Enrollment
Learn moreMedical Coding
Learn moreDenial Management
Learn moreA/R Recovery
Learn moreEligibility Verification & Prior Authorization
Learn moreMedical Billing Audit
Learn moreRevenue Cycle Management
Learn moreSpecialties we bill in Illinois
Illinois medical billing questions
What is the timely filing limit for Illinois Medicaid?
HFS must receive non-institutional fee-for-service claims within 180 days of the date of service. Medicare crossover claims have two years from the date of service. HealthChoice Illinois plans follow their own provider manuals, so confirm each plan's limit.
Who is the Medicare contractor for Illinois?
National Government Services (NGS) is the Jurisdiction 6 (J6) A/B MAC for Illinois, along with Minnesota and Wisconsin. Enrollment updates go through PECOS.
How long do Illinois insurers have to pay clean claims?
215 ILCS 5/368a requires payment within 30 days after receipt of a properly documented claim. If a claim is incomplete, the payer must notify the provider within 30 days. Late payments carry 9% annual interest.
Do I need IMPACT enrollment if I only see MCO patients?
Yes. Illinois requires providers serving Medicaid members to be enrolled in IMPACT, including providers who only bill managed care plans. Without an active IMPACT record, MCO claims can deny.
Get a free billing audit for your Illinois practice
We will review your recent claims and denials against Illinois payer rules and show you what can be recovered.
Nearby states
Primary sources
- CMS: Who are the MACs, A/B MAC Jurisdiction 6 (J6)
- HFS: Timely Filing Claim Submittal for Non-Institutional Providers
- Illinois HealthChoice Illinois contract announcement (June 2026)
- Illinois Department of Insurance: Public Act 92-0745 (215 ILCS 5/368a)
- 68 Ill. Adm. Code 1300.465 (APRN full practice authority)
Payer rules change. Last reviewed against the primary sources above on . Confirm current rules with the payer before relying on them.
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