Illinois Billing Guide for Mental Health Therapists and Psychiatrists
Who pays, where to enroll and which rules change your claims in Illinois, for psychotherapists and psychiatric prescribers.
Last checked October 25, 2026. Reviewed against the official sources listed at the bottom of this page.
This Illinois billing guide covers Medicaid, Medicare, Blue Cross, other private payers and state law for therapists and psychiatrists, with sources and a last-checked date.
Illinois billing guide: how Illinois pays for outpatient care
Illinois Medicaid, run by the Department of Healthcare and Family Services (HFS), pays for outpatient behavioral health mainly through HealthChoice Illinois managed care plans, with fee-for-service for some members and for HFS-processed claims. Providers enroll through HFS's IMPACT system before contracting with plans. Behavioral health is administered by the managed care plans, not by a separate statewide vendor.
Commercial coverage in Illinois is led by Blue Cross and Blue Shield of Illinois. Medicare Part B claims go to the Jurisdiction 6 contractor, National Government Services (NGS), which has operated as Wellpoint Federal since April 1, 2026. Current HealthChoice Illinois contracts expire December 31, 2026, and HFS has awarded new contracts to six payers.
Who to bill, at a glance
| Payer type | Who you bill | Where to enroll or check rules |
|---|---|---|
| Medicaid | Illinois Department of Healthcare and Family Services (HFS); HealthChoice Illinois plans plus fee-for-service | HFS IMPACT enrollment |
| Medicare Part B | National Government Services (NGS), operating as Wellpoint Federal, Jurisdiction 6 | CMS MAC page |
| Blue Cross Blue Shield | Blue Cross and Blue Shield of Illinois (HCSC) | See the Blue Cross section below |
Illinois Medicaid: HealthChoice Illinois
This Illinois billing guide starts with Medicaid, because it decides who pays and how you file.
Most Illinois Medicaid members are in HealthChoice Illinois managed care (about 2.38 million enrolled in HFS's November 2025 report). Fee-for-service remains for some members and for claims HFS processes directly. The HFS 96127 notice distinguishes fee-for-service claims from managed care claims, so check which one you are billing.
Behavioral health is administered by the HealthChoice Illinois plans. HFS publishes a behavioral health provider page with plan contacts and a prior-authorization comparison chart. Community-based behavioral health follows the HFS Community Based Behavioral Services handbook, and independent practitioners may deliver only Group A services.
| Item | What to know |
|---|---|
| Agency | Illinois Department of Healthcare and Family Services |
| Provider enrollment | IMPACT. HFS says providers must enroll in IMPACT before contracting with plans. |
| Fee schedules | HFS community mental health fee schedules. The most recent schedule listed is effective 8/1/2024. |
| Timely filing | HFS timely filing page: fee-for-service non-institutional claims are due within 180 days of the date of service, with listed exceptions. |
| Work requirement | HFS material dated July 14, 2026 (marked draft) says work requirements start January 1, 2027 for ACA adults 19 to 64 who are not on Medicare and have no child 18 or younger at home: 80 hours per month of work, community service, a work program or half-time education, or income of at least $580 per month. Source |
Managed-care plans and carve-outs
| Plan or entity | Role in behavioral health |
|---|---|
| Aetna Better Health of Illinois | Statewide per the HFS managed care map dated 1/1/2026. |
| Blue Cross Community Health Plans (Blue Cross and Blue Shield of Illinois, HCSC) | Statewide. Largest HealthChoice Illinois enrollment in the November 2025 HFS report. |
| Meridian Health Plan of Illinois | Statewide. Also administers YouthCare. |
| Molina Healthcare of Illinois | Statewide. |
| CountyCare Health Plan | Cook County only. |
| YouthCare | Statewide specialized plan for DCFS Youth In Care and Former Youth In Care. |
Medicare Part B in Illinois
For Medicare, this Illinois billing guide names your contractor and the current telehealth rules.
Medicare Part B pays for outpatient psychotherapy and psychiatric visits billed to the Medicare Administrative Contractor (MAC) for your state. CMS's July 14, 2026 fact sheet on the CY2027 Physician Fee Schedule proposed rule says the Consolidated Appropriations Act, 2026 extended telehealth payment authority through December 31, 2027, and proposes that in-person visit requirements for mental health visits not apply to services furnished through that date.
| Item | What to know |
|---|---|
| Contractor | National Government Services (NGS), operating as Wellpoint Federal |
| Jurisdiction | Jurisdiction 6: IL, MN and WI |
| Source | CMS.gov MAC page |
Blue Cross Blue Shield in Illinois
This part of the Illinois billing guide names the exact Blue Cross licensee, because Blue plans never share rules.
Blue Cross Blue Shield is a federation of independent companies, so one licensee's rules never apply to another. In Illinois that is Blue Cross and Blue Shield of Illinois (BCBSIL), a Health Care Service Corporation (HCSC) plan.
| Licensee | Parent or affiliation | Where it applies | Provider resources |
|---|---|---|---|
| Blue Cross and Blue Shield of Illinois (BCBSIL) | Health Care Service Corporation (HCSC) | Illinois | BCBSIL behavioral health program manual |
Other private payers and EAPs in Illinois
The Illinois billing guide also covers commercial plans and employee assistance programs.
These commercial payers and plan families most often matter for behavioral health billing in Illinois. Check each payer's current provider manual before you submit.
| Payer | Behavioral health note | Provider resources |
|---|---|---|
| Blue Cross and Blue Shield of Illinois | BCBSIL manages behavioral health for most non-HMO members (PPO, Blue HPN, Blue Choice PPO) and FEP. For HMO members, mental health and substance abuse administration is delegated to the member's Medical Group or IPA. Some employer groups use other vendors, so check the member ID card. | Official page |
| Aetna and Aetna Better Health of Illinois | Aetna Better Health of Illinois is a statewide HealthChoice Illinois plan. An August 6, 2026 provider letter clarifies Pathways to Success billing for children under 21 and CCBHC claims. | Official page |
| Cigna and Evernorth Behavioral Health | Evernorth's provider administrative guide prefers electronic claims through an EDI vendor with a 277CA acknowledgment. EAP claims must use CPT 99404. The guide is national, not Illinois-specific. | Official page |
Illinois billing guide: state law that changes billing
Use this section of the Illinois billing guide to separate state law from payer policy.
State law sets the floor for commercial plans in Illinois. Medicare and Medicaid rules are covered in their own sections above.
Mental health parity
215 ILCS 5/370c requires group policies to cover medically necessary treatment of mental, emotional, nervous and substance use disorders in line with parity rules. Medication management visits do not count toward the 60-visit outpatient minimum. Starting January 1, 2026, outpatient and partial hospitalization services for mental, emotional or nervous disorders generally cannot require prior authorization. Source
Telehealth coverage and payment parity
Per the Center for Connected Health Policy (updated 6/4/2026), private plans must cover telehealth like other benefits and pay in-network professionals the same rate as the equivalent in-person service. The payment-parity provision becomes inoperative on January 1, 2028 except for mental health and substance use disorder telehealth. Confirm HFS guidance for Medicaid. Source
Prompt payment and timely filing
Fee-for-service Medicaid non-institutional claims must be filed within 180 days of the date of service. Medicare crossovers get two years, and replacement or void claims get 12 months from the original paid voucher date. Source
Not legal advice. Confirm statute details with counsel.
Illinois billing guide: codes and rates
This Illinois billing guide lists only codes and rates confirmed on official pages.
These are the Illinois-specific codes, modifiers and rate items confirmed on official pages. Medicare's own CY2027 conversion factor proposal is listed under What changed.
| Code or item | What to know |
|---|---|
| CPT 96127 with modifier U1 or U2 | For dates of service on or after 8/1/2026, U1 means a negative screening result and U2 means a positive screening with a documented follow-up plan. A claim without one is rejected (fee-for-service error code L54). The notice applies to Medicaid fee-for-service claims, so ask each plan for its requirements. HFS notice dated 7/7/2026. Source |
| Community Based Behavioral Services fee schedule | The most recent schedule on the HFS page is effective 8/1/2024. Source |
| Telehealth: GT modifier, place of service 02 or 10, modifier 93 for audio-only | As summarized by the Center for Connected Health Policy. Confirm against the HFS handbook. Source |
Illinois billing guide: what changed, newest first
Check this Illinois billing guide update log before you rely on an older rule.
| Date | What changed | Source |
|---|---|---|
| 2027-01-01 | Medicaid work requirements begin for ACA adults. | Source |
| 2026-12-31 | Current HealthChoice Illinois contracts expire. Becker's Payer reports new contracts went to six payers. | Source |
| 2026-08-06 | Aetna Better Health of Illinois issued billing guidance on Pathways to Success and CCBHC claims. | Source |
| 2026-08-01 | CPT 96127 claims must carry modifier U1 or U2 or they are rejected. | Source |
| 2026-07-14 | CMS released the CY2027 Medicare Physician Fee Schedule proposed rule: conversion factor $32.84 for non-qualifying APM participants (down 1.68%) and $33.17 for qualifying participants (down 1.19%). | Source |
| 2026-04-01 | National Government Services began operating as Wellpoint Federal. | Source |
| 2026-01-01 | Outpatient and partial hospitalization services for mental, emotional or nervous disorders generally cannot require prior authorization (215 ILCS 5/370c). | Source |
How do I bill mental health claims in Illinois?
These answers come from the same sources as the rest of this Illinois billing guide.
Start with the member's payer type. For Illinois Medicaid, enroll in IMPACT, then bill the member's HealthChoice Illinois plan or HFS fee-for-service. Medicare Part B goes to NGS (Wellpoint Federal) in Jurisdiction 6. Blue Cross and Blue Shield of Illinois, an HCSC plan, is the Blue licensee for commercial members.
Questions about billing in Illinois
Does Illinois require a modifier on CPT 96127?
Yes, for Medicaid fee-for-service claims with dates of service on or after August 1, 2026. Use U1 for a negative screening result or U2 for a positive screening with a documented follow-up plan, or the claim is rejected. Ask each managed care plan for its own requirements.
What is the Illinois Medicaid timely filing limit?
Fee-for-service non-institutional claims must be filed within 180 days of the date of service, with listed exceptions such as two years for Medicare crossovers. Managed care plans set their own limits, so check each plan's manual.
Who covers behavioral health for Illinois Medicaid members?
HealthChoice Illinois plans administer behavioral health benefits, and fee-for-service covers some members. Enroll in HFS IMPACT first, then contract with the plans you want to bill.
When do Illinois Medicaid work requirements begin?
January 1, 2027, for ACA adults 19 to 64 who are not on Medicare and have no child 18 or younger at home, according to HFS material dated July 14, 2026.
Does MCM South bill for practices in Illinois?
MCM South serves Illinois. Request a quote to talk through your practice.
Sources for the Illinois billing guide
Last checked October 25, 2026. Every source below was opened and read on that date.
- HFS notice: CPT 96127 coding update, checked October 25, 2026
- HFS community-based behavioral health services, checked October 25, 2026
- HFS IMPACT, checked October 25, 2026
- HFS community mental health fee schedules, checked October 25, 2026
- HFS care coordination information for behavioral health providers, checked October 25, 2026
- HFS timely filing (non-institutional), checked October 25, 2026
- HFS managed care map (1/1/2026), checked October 25, 2026
- HFS work requirements toolkit, checked October 25, 2026
- 215 ILCS 5/370c, checked October 25, 2026
- BCBSIL behavioral health program manual, checked October 25, 2026
- Evernorth behavioral health provider administrative guide, checked October 25, 2026
- Center for Connected Health Policy: Illinois, checked October 25, 2026
- CMS: CY2027 Physician Fee Schedule proposed rule fact sheet, checked October 25, 2026
- CMS MAC jurisdiction page, checked October 25, 2026
Related guides
- State & Regional Billing Guides hub
- Illinois insurance companies contact guide
- In-network vs out-of-network credentialing
- Credentialing and network status
- Blue Cross Blue Shield guide for Illinois
- Illinois Medicaid billing codes
- Mental health parity explained
- Medicaid managed care billing
- Medicare behavioral health billing
- Timely filing in the billing glossary
- Who we serve
- Connecticut insurance companies contact guide
Billing in Illinois? Let us handle the payer calls.
MCM South bills only mental and behavioral health, for psychotherapists and psychiatrists, in solo and medium-size practices. We serve Illinois.
MCM South currently serves practices in ten states: Georgia, Massachusetts, Connecticut, Texas, Florida, New York, Colorado, Tennessee, North Carolina and Illinois.