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- Key Takeaways
- Illinois PA 104-0446 requires covered commercial insurers to pay in-network behavioral health providers at least 141.7% of the Medicare fee-for-service rate for covered mental health and substance use disorder (MH/SUD) services. It applies from each plan year that starts on or after January 1, 2027.
- The floor applies to Illinois group and individual PPO policies and to self-funded county, municipal and school district plans. It does not apply to HMOs, Medicaid, Medicare, out-of-state group policies, or other self-funded plans, including ERISA employer plans.
- Insurers must pay the floor even when your contracted fee schedule is lower. No contract amendment is required (IDOI Company Bulletin 2026-12).
- CPT 90837 is protected under Section 370c.4(e): payers cannot audit it more often, or require more documentation, than for other psychotherapy codes.
- A solo practitioner billing 25 sessions a week at a conservative $30 per-session lift stands to gain about $37,500 in additional annual revenue.
Illinois has changed the economics of behavioral health practice. On December 12, 2025, Governor JB Pritzker signed Public Act 104-0446 (HB 1085) into law. It establishes a statutory commercial reimbursement floor for MH/SUD services. Starting with plan years that begin on or after January 1, 2027, covered commercial insurers must pay in-network behavioral health providers at least 141.7% of the Medicare fee-for-service rate for covered MH/SUD services.
For LCSWs, LCPCs, psychologists, psychiatrists and group practice administrators on commercial panels, this is a structural upward reset in reimbursement, and not one that negotiation alone could have produced. But the floor is an entitlement that has to be claimed. Practices that do not know their floor amounts, bill below them, or never check payments against them will leave much of the gain uncollected.
This guide covers what PA 104-0446 does, who it applies to, what the Illinois Department of Insurance (IDOI) clarified in its September 2026 bulletin, what the law means for your revenue, and what to do before January 1, 2027.
What Is Illinois PA 104-0446?
Illinois PA 104-0446 is a state law that sets a minimum reimbursement rate for in-network mental health and substance use disorder services under covered commercial policies. It amends the Illinois Insurance Code at 215 ILCS 5/370c.4. The floor is 141.7% of the Medicare fee-for-service allowed amount for the same code, in the same geographic locality, on the date of service.
The law applies to policies amended, delivered, issued or renewed on or after January 1, 2027. In practice, each plan must comply from the start of its own plan year. A plan that renews on January 1, 2027 owes the floor from January 1. A plan that renews in March 2027 owes it from March.
The 141.7% figure comes from a formula written into the statute. RTI International’s April 2024 behavioral health parity study found that Illinois commercial insurers paid medical and surgical clinicians an average of 132.0% of Medicare, and 151.4% at the 75th percentile. The statute adds half the difference between those figures (9.7) to the average, which gives 141.7%. IDOI confirmed the calculation in Company Bulletin 2026-12, which states that the applicable percentage “is always 141.7%.”
One important built-in protection: the floor includes a one-way ratchet. If Medicare rates fall in any future year, the Illinois floor stays at the prior year’s level. The January 1, 2027 anchor is permanent.
What IDOI’s Company Bulletin 2026-12 Clarified
On September 11, 2026, IDOI issued Company Bulletin 2026-12, its implementation guidance on HB 1085. Five points matter most to providers:
- The floor applies even if your contract says less. If the fee schedule in effect on the date of service is below the floor, the insurer or its contracted third party must still pay at least the floor. Failing to update a nonconforming fee schedule does not delay that obligation.
- There will be no published floor table. IDOI does not intend to publish a complete set of floor dollar amounts. Insurers calculate them, and practices should too.
- Timing follows the plan year, not your contract. The compliance date depends on when the underlying policy’s plan year starts, not on when your provider contract renews.
- Only codes Medicare pays fee-for-service are covered. If Medicare has no fee-for-service rate for a code, the floor does not apply and your contracted rate governs.
- Third parties are bound too. The floor applies to any contracted third party that administers behavioral health benefits for the insurer, including TPAs and preferred provider program administrators. This holds whether or not the third party contracts directly with you.
What Is Illinois HB 1085? Why the Law Has Two Names
Most providers come across this law under two names, and both are correct. HB 1085 is the bill number the legislation was given when Rep. Lindsey LaPointe introduced it in the Illinois House on January 2, 2025, with Senate sponsorship led by Sen. Don Harmon. Provider associations, advocacy groups and industry press still use it most often, including NASW-Illinois in its “Summary of HB 1085.” PA 104-0446 (Public Act 104-0446) is the official designation assigned when Governor Pritzker signed the bill. Both names refer to the same statute, codified at 215 ILCS 5/370c.4.
According to the Illinois General Assembly’s official bill status record, HB 1085 passed the House 72–33 on April 7, 2025, and the Senate 48–10 on October 30, 2025. It was sent to the Governor on November 21, 2025 and signed on December 12, 2025.
The Act nominally became law on June 1, 2026. However, IDOI has clarified that Section 370c.4 only imposes requirements for policies amended, delivered, issued or renewed on or after January 1, 2027.
Who Does PA 104-0446 Apply To?
The rate floor applies only to in-network services from participating providers. Check whether it covers each plan in your payer mix before assuming it applies to all of it.
The rate floor applies to:
- Group and individual PPO policies written in Illinois
- Self-funded health plans for employees of Illinois counties, municipalities and school districts, including those with PPO or EPO networks
- Contracted third parties that administer behavioral health benefits for covered insurers, including TPAs
The rate floor does not apply to:
- HMO plans
- Self-funded plans other than those for Illinois counties, municipalities and school districts, including ERISA employer plans
- Group policies sitused outside Illinois, even when they cover Illinois residents
- Medicaid and All Kids
- Medicare, including Medicare Advantage
- Tricare and the Federal Employee Health Benefits Program
- Excepted benefits such as dental-only, hospital indemnity and Medigap
Non-network indemnity policies are a partial case. They do not get the rate floor, but they are subject to the law’s same-day services, trainee and CPT 90837 protections.
What this means in practice: if your practice works mainly on PPO contracts with BCBSIL, UnitedHealthcare/Optum, Aetna or Cigna/Evernorth, PA 104-0446 is directly relevant to your revenue. If much of your panel is on HMO or private self-funded employer plans, those contracts are outside the floor.
One strategic risk: insurers may steer employer groups toward self-funded and HMO products to avoid the floor. It is worth monitoring shifts in your payer mix through 2027.
What Services and Codes Are Covered?
The rate floor applies to the full range of MH/SUD services billed under commercial insurance — not just outpatient therapy. Covered services include:
- Psychotherapy: CPT 90832, 90834, 90837, 90846, 90847
- Diagnostic evaluations: CPT 90791, 90792
- Add-on codes: CPT 90785, 90833, 90836, 90838
- Crisis services: CPT 90839, 90840
- Group therapy: CPT 90853
- Psychiatric evaluation and management: CPT 99202–99215, 99221–99239
- Facility services where Medicare pays fee-for-service. Benchmarks are the Medicare inpatient prospective payment system (IPPS) for inpatient and the outpatient prospective payment system (OPPS) for outpatient.
If Medicare has no fee-for-service rate for a code, the floor does not apply and your contracted rate governs.
Telehealth counts. Under 215 ILCS 5/356z.22(d), Illinois-regulated policies must reimburse MH/SUD telehealth services at the same rate as in-person services. The floor therefore applies even where Medicare would pay less for telehealth.
A specific protection for CPT 90837
Section 370c.4(e) requires covered insurers to cover medically necessary 60-minute psychotherapy billed as CPT 90837. It also prohibits them from imposing more onerous documentation requirements for 90837 than for other psychotherapy codes, or auditing 90837 more often. This responds to a common industry practice: treating routine 90837 use as an audit trigger and pushing providers to downcode to 90834 or 90832.
The protection applies to in-network, out-of-network and non-network indemnity coverage alike. For practices where 90837 is the main billing code, it matters as much as the rate floor.
What Does 141.7% of Medicare Mean for Your Revenue?
For the most common psychotherapy code, the floor is worth about $27 to $57 more per session, depending on your current contracted rate.
The 2026 Medicare Physician Fee Schedule sets the national non-facility rate for CPT 90837 at about $167.00. At 141.7% of Medicare, the floor for a single 90837 session is about $236.60. Your actual floor depends on your Medicare locality.
Current reported commercial averages for BCBSIL and comparable Illinois PPO payers in major markets run between $180 and $210 for the same code. That puts the floor at roughly $27 to $57 above current rates on your most frequently billed code.
Across a practice, that adds up quickly. A solo practitioner seeing 25 sessions a week over 50 weeks at a conservative $30 average lift would gain about $37,500 in additional annual revenue without adding a single new patient. A group practice of 10 clinicians at the same volume and lift would gain about $375,000 a year. For practices whose current rate is closer to $180, the lift is larger.
These figures use the national rate. Because IDOI will not publish a floor table, calculate 141.7% of the Medicare fee-for-service rate for each of your top codes in your own locality.
What matters most is what you bill and what you check. Many contracts pay the lesser of billed charges or the allowed amount, and IDOI has not said the floor overrides that. So set your billed charges at or above the floor, or you may be paid your lower billed charge.
The Credentialing Provisions: New Protections That Change the Math
PA 104-0446 does not just set a rate floor. Section 370c.4(f) includes four credentialing provisions that are unusually provider-friendly and have direct revenue implications — particularly for practices adding clinicians or expanding into new payer networks.
60-day credentialing clock. Insurers and their BH TPAs must complete credentialing verification and contracting within 60 days of a completed application. A “completed application” is defined as one that includes all information required under the insurer’s published policies. This is a meaningful constraint: typical clean-application timelines at BCBSIL, UHC/Optum, Aetna, and Cigna/Evernorth currently run 60 to 120 days, with delays frequently exceeding the upper end.
Retroactive billing to application date. Once a contract is finalized, the insurer must pay the contracted rate — including the rate floor — for services delivered between the date of the completed application and the contract effective date. This neutralizes one of the most common revenue losses in credentialing: the gap period between application submission and in-network activation. For a practice submitting applications in May 2026 and contracting in August, services billed during that window become retroactively reimbursable at the contracted rate.
Supervised billing for pending applicants. A fully licensed MH/SUD clinician who has submitted a completed application may deliver services under a participating supervisor’s NPI through their contract effective date. This allows practices to generate revenue from new clinicians before their individual credentialing is finalized.
Behavioral health trainee coverage. Master’s and doctoral students and post-licensure clinicians working toward full licensure must be covered when supervised by a fully licensed clinician and billed under the supervisor’s NPI. For practices that employ LCSW Associates or LCPC Associates, this creates a new commercial revenue stream that previously did not exist.
For practices unfamiliar with how credentialing and contracting interact, Neolytix’s overview of what insurance credentialing involves provides a detailed breakdown of the full enrollment process.
Credentialing transparency: Insurers must provide applying providers with their credentialing policies and procedures. They must also post on their websites a list of required application information, a checklist of credentialing materials, and a designated network contact with a name, email and phone number. These postings create a record you can point to when a payer claims an application is incomplete.
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Payer Contract Negotiation
What Providers Need to Do Before January 2027
Four steps between now and January 1, 2027 will decide how much of the floor your practice collects.
1. Know what you are owed. Calculate 141.7% of the Medicare fee-for-service rate for each of your top billed codes in your locality. Compare those figures with your fee schedule and twelve months of remittances to see where you are below the floor. Set billed charges at or above the floor. It is an afternoon of work that shows how much of this applies to you.
2. Identify which plans the floor reaches. The floor applies to in-network services under Illinois PPO policies and self-funded county, municipal and school district plans. It does not reach HMOs, other self-funded plans, out-of-state group policies, Medicaid or Medicare. Payers are not required to tell you which plans qualify, so benefits verification becomes the gate. Make sure front-office staff know what to look for.
3. Check every payment. You do not need a contract amendment: insurers must pay the floor even when the fee schedule says less. But the obligation starts on each employer’s plan renewal date, and nothing on a remittance will flag an underpayment. Map renewal dates by employer group. Check payments against the floor plan by plan, appeal underpayments, and file a complaint with IDOI when an insurer or its third party will not comply.
4. Get credentialing complete now. Submit complete applications to every commercial payer in parallel, and keep dated, signed evidence of each submission. Load supervisors correctly so that pending clinicians in the same group practice, and trainees, can bill under their NPIs. Keep your CAQH ProView profile current. Illinois-specific disclosure questions were added in August 2025, and re-attestation is required every 180 days. For group practices managing many applications at once, Neolytix’s guide to group practice credentialing covers how to avoid enrollment gaps.
Still worth reviewing in your contracts. The floor does not depend on your contract, but some terms still affect what you collect:
- Unilateral amendment rights. Look for clauses that let the payer change rates or policies through “manual updates” or website postings without mutual written consent.
- Anti-downcoding protection for CPT 90837. This should be backed by a written explanation requirement for any reclassification.
- Clawback limits. Cap recoupment lookback at 12 months, absent adjudicated fraud.
- Most-favored-nation (MFN) clauses. These can pull down rates on plans the floor does not cover.
Understanding the broader payer contracting landscape is worth the time before you open these conversations.
One critical distinction: credentialing approval and contract activation are not the same thing. In-network billing requires both a credentialing approval and a countersigned contract with an issued effective date. Do not assume an approval means you are contracted.
PA 104-0446 at a Glance: A quick-reference summary of the law’s key provisions, plus a 6-step readiness checklist covering credentialing audits, CAQH refresh, contract redlines, and billing system prep. Everything your team needs to act on before the January 1, 2027 deadline.
Payer Tactics to Watch For
Three tactics are likely to emerge in Illinois as the floor takes effect:
- Downcoding pressure on CPT 90837. Utilization scrutiny may continue despite the Section 370c.4(e) protection. Document any reclassification and dispute it in writing.
- Tighter utilization management. PA 104-0446 does not cap prior authorization or concurrent review, so payers may try to reduce claim volume instead of rates.
- Product steering and MFN clauses. Payers may move employer groups to HMO or self-funded products that the floor does not reach. Illinois does not restrict MFN language, so a low rate on those plans can still pull other rates down.
Each of these is a contract clause, not a statutory gap — which means each has a specific redline fix. See Neolytix’s 5 Payer Contract Clauses That Could Erase Illinois’ 41% Behavioral Health Rate Hike for the clause-by-clause language to strike before signing.
How Neolytix Can Help
PA 104-0446 rewards practices that prepare. The right operational moves produce lasting revenue gains, and inaction leaves money uncollected. Neolytix’s service lines cover the three areas practices need.
Payer contract negotiation. A contract audit against the floor, term restructuring, anti-downcoding protections, clawback limits, MFN review and unilateral amendment strikes across all four major commercial payers. With over 14 years of experience negotiating payer agreements across all 50 states, Neolytix brings the benchmarking data and payer-specific knowledge to negotiate from a position of strength.
Credentialing and enrollment. Parallel four-payer application submission, tracking of the 60-day statutory clock, dated application records for gap-period payment, supervisor NPI setup, and monitoring of the CAQH 180-day re-attestation cycle.
Revenue cycle management. The ongoing work after 2027: auditing every remittance against the calculated floor for each code and locality, appealing sub-floor payments, and filing IDOI complaints where warranted. This is recurring, high-volume work that needs a structured workflow, and Neolytix’s RCM services are built for that kind of systematic compliance auditing at scale.
🔔 Illinois changed the rules for BH reimbursement. Here’s how to capture every dollar.
HB 1085 sets a floor of 141.7% of Medicare for Illinois commercial behavioral health reimbursement, for plan years starting on or after January 1, 2027. Enter your clinician count, session volume and current rates into Neolytix’s free IL HB 1085 Revenue Calculator to see your rate-uplift number in seconds.
You’ll get instantly:
- Your annual uplift, calculated from your own clinician count, session volume and current commercial rates
- A breakdown of the other HB 1085 revenue streams and which apply to your group
- A starting number for your billing, payment monitoring and credentialing planning
Conclusion
Illinois PA 104-0446 is a structural change to commercial behavioral health reimbursement. For LCSWs, LCPCs, psychologists, psychiatrists and group practice administrators on covered commercial panels, it represents a real increase in per-session revenue, anchored in statute.
But the floor does not collect itself. IDOI will not publish what you are owed, payers are not required to tell you which plans qualify, and nothing on a remittance will flag an underpayment. The practices that calculate their floor amounts, bill at or above them, check every payment and finish credentialing before January 1 will capture the full benefit of the law.
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Frequently Asked Questions
When does the Illinois behavioral health reimbursement rate floor take effect?
The rate floor applies to policies amended, delivered, issued or renewed on or after January 1, 2027. Each plan must comply from the start of its own plan year, so a plan that renews in March 2027 owes the floor from March, not January.
Do insurers have to pay the floor if my contract rate is lower?
Yes. IDOI Company Bulletin 2026-12 says insurers must pay at least the floor even when the fee schedule in the provider’s contract is lower, and failing to update that fee schedule does not delay the obligation. No contract amendment is needed.
Will IDOI publish per-code floor amounts?
No. IDOI has said it does not intend to publish a complete set of floor dollar amounts. Insurers calculate the floor as 141.7% of the Medicare fee-for-service allowed amount for each code and locality, so practices should run the same calculation for their own top codes.
Does Illinois PA 104-0446 apply to Medicaid providers?
No. The floor does not apply to Medicaid or All Kids. It also excludes Medicare, HMOs, Tricare, the Federal Employee Health Benefits Program, group policies sitused outside Illinois, and self-funded plans other than those for Illinois counties, municipalities and school districts.
What is the CPT 90837 reimbursement rate under PA 104-0446?
There is no single rate. The floor is 141.7% of the Medicare fee-for-service rate in your locality. Using the 2026 national non-facility Medicare rate of about $167.00, the floor for CPT 90837 is about $236.60 per session.
Does the rate floor apply to telehealth?
Yes. Under 215 ILCS 5/356z.22(d), Illinois-regulated policies must pay MH/SUD telehealth services at the same rate as in-person services, so the floor applies even where Medicare would pay less for telehealth.
Sources
- Illinois Department of Insurance, Company Bulletin 2026-12, Guidance on Implementation of HB 1085 (September 11, 2026): idoi.illinois.gov
- 215 ILCS 5/370c.4, Illinois Compiled Statutes: ilga.gov
- Illinois General Assembly, HB 1085 bill status: ilga.gov
- NASW-Illinois, Summary of HB 1085: naswil.org
- Mark & Parish, “Behavioral Health Parity: Pervasive Disparities in Access to In-Network Care Continue,” RTI International, April 2024: rti.org
- CMS, Medicare Physician Fee Schedule Look-Up Tool: cms.gov
