Illinois Insurance Companies Contact: Behavioral Health Provider Numbers
Illinois insurance companies contact information is the set of provider phone numbers and official pages a mental health practice uses for eligibility, claims and appeals. This page lists the behavioral health provider numbers for private insurers that cover Illinois, plus Illinois Medicaid enrollment. Checked October 2026.
MCM South Medical Billing Service bills for psychotherapists and psychiatrists in Illinois and makes these calls for them. Get a Free Quote
Behavioral health provider contacts
IllinoisInsurance Companies Contact
Provider phone numbers for psychotherapists and psychiatrists, checked and sourced.
Confirmed October 2026
Illinois insurance companies contact: private payer provider numbers
Call the provider services number on the patient’s member ID card first. The numbers below come from each insurer’s official provider page. Blue Cross Blue Shield is a federation of independent companies, so only the Illinois licensee applies here. Nothing on this page is legal advice.
| Insurer | Provider phone | Official page |
|---|---|---|
| Aetna | 888-632-3862 Non-Medicare plans 800-624-0756 Medicare plans |
Aetna provider contact page |
| Ambetter of Illinois (Centene) | 855-745-5507 General line on the provider resources page | Ambetter Illinois provider page |
| Blue Cross and Blue Shield of Illinois (HCSC) | 800-972-8088 Provider customer service 800-572-3089 Medical management |
Provider home |
| Carelon Behavioral Health (formerly Beacon Health Options) | 800-397-1630 National provider services line: network status and general questions 800-888-3944 General questions about claims 800-282-4548 Availity Essentials support: claims, eligibility, claim status 877-331-7154 Payspan registration: direct deposit and remittance |
Provider contact information |
| Cigna Healthcare and Evernorth Behavioral Health | 800-882-4462 Cigna Healthcare 800-926-2273 Evernorth Behavioral Health |
Cigna provider home |
| Humana | 800-457-4708 Medicare eligibility, benefits, claims 800-523-0023 Prior authorization, including behavioral health |
Humana provider home |
| Molina Healthcare of Illinois | 855-866-5462 Provider network management | Molina Illinois provider page |
| Oscar Health | 855-672-2755 Provider services, option 4: eligibility, billing, claims, prior authorization | Oscar provider contact page |
| Optum Behavioral Health (UnitedHealthcare) | 877-614-0484 Behavioral health and substance use, 24/7 | UnitedHealthcare provider contact directory |
| UnitedHealthcare | 800-600-9007 Medicare Advantage and Community Plan 888-478-4760 Individual exchange plans 800-291-2634 All Savers |
UnitedHealthcare provider contact directory |
Illinois Medicaid provider enrollment
Department of Healthcare and Family Services (IMPACT): call 1-877-782-5565, option 1 for Provider Enrollment. Confirm managed care plan requirements with each plan. Checked October 2026. Source: IMPACT contact page.
Illinois Medicare: who processes your Part B claims
Illinois Medicare claims go to one Medicare Administrative Contractor (MAC). National Government Services (NGS) is the MAC for Illinois. NGS began operating under the name Wellpoint Federal on April 1, 2026. CMS lists Illinois in Jurisdiction 6 on its CMS Jurisdiction 6 page (last modified July 8, 2026). Medicare Advantage plans from Aetna, Humana or UnitedHealthcare are private plans, so call the number on the member card for those. Medicare, Medicaid and private payers follow different rules. Phone numbers come from the CMS provider contact table, checked October 2026.
| Medicare contractor | Jurisdiction | Provider phone | Official page |
|---|---|---|---|
| National Government Services (NGS), operating as Wellpoint Federal | Jurisdiction 6 (Illinois, Minnesota, Wisconsin) | 866-234-7340 (TTY 877-236-7849) | Wellpoint Federal provider contact page |
What to have ready before you call a Illinois insurer
A short, prepared call is faster than a long one. Keep these in front of you before you dial any Illinois insurance companies contact number:
- The patient’s name as it appears on the card, date of birth and address.
- Your individual NPI (National Provider Identifier) and your tax ID.
- The date of service, the CPT code and the total billed amount. See the non-E/M CPT guide and the E/M CPT guide for psychiatrists.
- The claim number from the payer portal, if you have one.
Write down the name of the representative and a call reference number. Phone menus, holds and transfers can add up, and a dropped call means starting over. If you would rather not make these calls, MCM South does it for psychotherapists and psychiatrists.
Illinois insurance contact FAQs
Who do I call for Illinois insurance eligibility and claims for therapy?
Call the provider services number on the patient’s member ID card. If the plan carves out behavioral health, use the behavioral health number for that plan, listed in the table above.
Does MCM South bill Illinois practices?
Yes. Illinois is one of the ten states MCM South serves, for psychotherapists and psychiatrists. Insurance verification, denied claim follow-up and credentialing are part of the work.
Where are the numbers for other states?
The full insurance companies contact directory lists insurers by state, with the date each number was checked.
Related: CPT and E/M code guide, in-network vs. out-of-network, billing terms glossary and billing services.
Free CPT code quick sheets for Illinois practices
Three one-page PDFs for your billing desk, built to sit beside the Illinois insurance companies contact numbers above. Each lists the codes with time ranges and links to the CMS pages we checked in October 2026. CPT codes are national, but payer rules vary by state and by insurer.
E/M codes for psychiatrists
Evaluation and management codes plus psychotherapy add-ons, with time ranges.
Psychotherapy codes (non-E/M)
Individual, family, group and crisis psychotherapy codes at a glance.
Psychological and neuropsychological testing codes
Testing, administration and scoring, and brief screening codes.