Illinois HB 1085: What to Do Before 2027

Last updated: October 19, 2026.

Implementation update: The September IDOI bulletin clarifies several questions raised in this August guide. The affected sections below have been corrected. Read our October rollout check-in for what has changed and what remains unverified.

Illinois HB 1085 is now law. The governor approved it on December 12, 2025, it became Public Act 104-0446, and its reimbursement provisions apply to covered plans amended, delivered, issued, or renewed on or after January 1, 2027. Illinois General Assembly.

Most of the coverage so far has focused on the headline number: a reimbursement floor of 141.7% of the Medicare rate for in-network mental health and substance-use services under covered commercial plans. That number matters, and we modeled what it could mean for a therapy practice in our Illinois 90837 rates post.

This post is about the other half of the law: the parts that depend on what your practice does between now and January 2027. The floor is written into statute, but how much of it reaches your practice runs through your payer contracts and your credentialing status. That is the part you can act on this year.

Practice takeaway: identify qualifying patient policies and your participation status, then compare actual allowed amounts with the applicable floor. An outdated provider fee schedule does not delay the payer’s obligation once the underlying policy is subject to the law.

TL;DR: What HB 1085 Changes

• A reimbursement floor. Covered commercial plans must reimburse in-network mental health and substance-use services at no less than 141.7% of what Medicare would pay. The floor is set by formula and does not go down if Medicare rates drop. NASW-IL summary.

• A 60-day credentialing clock. Insurers must complete the contracting process, including credential verification, within 60 days of receiving a completed application. IHA memo.

• Retroactive payment for new contracts. Once a contract is finalized, reimbursement reaches back to the date the completed application was received, not the date the contract was signed. IHA memo.

• Limits, too. Qualifying Illinois-regulated PPO-type policies and certain self-funded county, municipal and school-district employee plans are covered. HMOs, Medicaid/All-Kids, Medicare and other self-funded plans are excluded. IDOI guidance, pages 1–2.

Use the right Medicare benchmark

Our August version compared alternative calculations based on clinician-specific Medicare payment percentages. IDOI has since specified the medical/surgical clinician benchmark for the same service code, date and geography, with applicable adjustments. Do not automatically substitute a therapist’s own reduced Medicare payment. IDOI methodology, pages 5–7.

The confirmed multiplier is 1.417. For illustration only, a hypothetical applicable benchmark of $160 would produce a $226.72 floor. That is arithmetic, not a quoted Illinois rate for 90837 or 90791. Ask the payer to identify its benchmark year, locality, setting and adjustments, and reconcile that explanation with the CMS Physician Fee Schedule search tool. IDOI does not intend to publish a complete set of dollar floors.

Who HB 1085 Covers, and Who It Does Not

This is the first thing to check before making any plans around the law, because the most common disappointment will be a plan that turns out not to be covered.

IDOI’s September guidance includes qualifying Illinois-regulated PPO-type policies and certain self-funded plans for Illinois county, municipal and school-district employees. It excludes HMOs, Medicaid/All-Kids, Medicare, other self-funded plans and qualifying group policies sitused outside Illinois. Living or practicing in Illinois is not enough to establish that a patient’s policy qualifies. IDOI plan applicability, pages 1–2.

A practical consequence: two clients with the same insurance card brand can sit on opposite sides of the line, because one employer self-funds its plan and another buys a fully insured one. Whether a given plan is covered is a plan-level question, not a payer-level one.

Keep Supervision, Network Participation, and Plan Coverage Separate

These are three different questions. A plan being self-funded rather than fully insured changes the plan-level question; it does not answer the other two.

• Clinical supervision: this is the professional and practice relationship between a trainee or clinician and a qualified supervisor. A patient having a self-funded plan does not change whether supervision is required or whether that relationship meets the applicable licensing rules.

• Network participation: this is whether the clinician or group has been credentialed and contracted with the network. It is an important prerequisite, but it is not a promise that every employer plan using that network will process the clinician the same way.

• Plan coverage and billing: this is whether the particular member plan recognizes the clinician and the proposed billing arrangement. Check the member's actual eligibility and benefits, the clinician's network status, and any supervisor or billing requirements before assigning care.

HB 1085 has a specific protection for covered Illinois plans: medically necessary services from a behavioral health trainee working toward clinical State licensure under an eligible fully licensed supervisor must be covered, with the service billed under the supervisor's rendering NPI. That is a covered-plan billing rule, not a change to clinical supervision rules or a blanket credentialing rule for every clinician and plan. Public Act 104-0446.

Practical assignment check: confirm the supervision arrangement first, then network participation, then the specific patient plan's coverage and billing rules. A self-funded plan can affect the third step even when the first two are satisfied.

The 60-Day Credentialing Rule

Credentialing timelines are one of the oldest complaints in Illinois private practice. Applications that sit for four to six months are common enough that we wrote a guide to Illinois credentialing timelines before this law existed.

HB 1085 changes the mechanics in two ways. IHA summarizes them: insurers must complete the contracting process with a behavioral health provider within 60 days of the completed application, including credential verification. And once a contract is finalized, reimbursement is retroactive to the date the completed application was received.

Two cautions on reading that generously. The 60-day clock runs from a completed application, so incomplete submissions restart the argument about when the clock started. And the rule does not presume a contract: both sides still have to finalize one. What the law removes is the open-ended waiting, and what it adds is the retroactive payment window once a contract lands.

For applications already pending in 2026: retain the completed-application date and ask the payer how the transition applies. Do not assume the new provisions guarantee payment for 2026 services or automatically make you in-network. Confirm the contract’s effective date and the applicable patient-policy dates.

Why Your Contracts Suddenly Matter

The floor provisions apply to covered plans amended, delivered, issued, or renewed on or after January 1, 2027. Public Act 104-0446. IDOI now clarifies that the relevant cycle is the patient’s underlying policy—not your provider contract’s renewal. An outdated below-floor fee schedule does not postpone compliance. IDOI, pages 4–5

That is why the practical advice from practice-side commentators has converged on the same short list: know what your current contracts say, know your current allowed amounts, and pay attention to renewal paperwork and amendments between now and 2027. An amendment that arrives in late 2026 deserves a closer read than usual.

A surprising number of practices cannot do step one, because they do not have copies of their payer contracts. That is normal, not negligent: contracts get signed in an online portal years ago, the practice changes EHRs or owners, and the PDF never lands anywhere durable. If that is you, the fix is straightforward: the payer has the contract, and you (or your biller) can request a copy from each network you participate in.

What to Do Before January 2027

1. Get copies of your payer contracts. Request one from each payer you participate with. You want the rate exhibit or fee schedule, the renewal and amendment terms, and the notice windows.

2. Track your allowed amounts. Not what the plan paid after cost-sharing: the allowed amount, per CPT code, per payer. That is the number the floor gets compared against. Our 90837 rates post walks through the math with worked examples.

3. Confirm patient-policy dates. Track when each qualifying policy is issued, amended or renewed on or after January 1, 2027. Your provider-contract renewal date does not control this deadline.

4. Start credentialing you have been putting off. Keep submission receipts, the list of required materials and confirmation that the application is complete. Ask how the 2027 provisions apply to the relevant network and policies; do not presume a contract or retroactive coverage.

5. Read late-2026 payer amendments carefully. Check that the fee schedule and implementation explanation agree. A contract amendment is useful evidence, but the absence of one does not excuse paying below an applicable statutory floor.

How Bomi Handles This for Its Practices

For practices we bill and credential for, this list is work we do rather than homework we assign. We track which networks each practice and clinician participates in, we can request contract copies from payers on the practice’s behalf, we track allowed amounts from remittances as a matter of course, and credentialing applications are our paperwork to complete and chase. If you run an Illinois practice and want this handled, that is what we do.

Frequently Asked Questions

What is Illinois HB 1085?

HB 1085 is an Illinois law, now Public Act 104-0446, signed December 12, 2025. For covered commercial plans it sets a reimbursement floor of 141.7% of the Medicare rate for in-network mental health and substance-use services, requires insurers to complete provider contracting within 60 days of a completed application, and makes reimbursement retroactive to the application date once a contract is finalized.

When does HB 1085 take effect?

The act has an effective date of June 1, 2026, and its reimbursement-floor provisions apply to covered plans amended, delivered, issued, or renewed on or after January 1, 2027. Because the floor reaches a plan through its issue, amendment, or renewal cycle, the change arrives plan by plan rather than all at once.

Does HB 1085 apply to self-funded employer plans?

Usually not, but IDOI identifies an important exception for certain self-funded Illinois county, municipal and school-district employee plans. Other self-funded plans are excluded. Check the employer, plan structure and policy applicability rather than treating all self-funded plans alike.

Does a self-funded plan change clinical supervision rules?

No. Clinical supervision is a professional and practice responsibility, not a feature of the patient's funding arrangement. The plan type can still affect whether the specific plan recognizes the clinician and billing arrangement. For state-regulated plans covered by HB 1085, the Act includes a separate rule for certain behavioral health trainees working toward licensure under an eligible supervisor; it does not create a blanket credentialing right for every clinician or plan.

If a clinician is in a network, can they see every patient with that insurance brand?

Not automatically. Credentialing and network participation are separate from a member plan's benefits and billing rules. Confirm the specific patient plan's eligibility and benefits, the clinician's network status, and any supervisor or billing requirements before assigning care—especially when an employer self-funds a plan administered by a familiar insurance brand.

What is the 60-day credentialing requirement?

Insurers must complete the contracting process with a behavioral health provider, including credential verification, within 60 days of receiving a completed application. The rule does not presume a contract will be signed, but once one is finalized, reimbursement is retroactive to the date the completed application was received.

Do I need copies of my payer contracts?

Yes: request the participation agreement and fee schedule to understand your existing terms. But IDOI says the rate-floor deadline follows the underlying patient policy, not provider-contract renewal, and an outdated below-floor fee schedule does not defer compliance.

How much is the HB 1085 floor in dollars for 90837?

This guide does not quote an official statewide 2027 dollar rate. IDOI confirms a 1.417 multiplier applied to the appropriate Medicare fee-for-service medical/surgical clinician benchmark for the same code, service date and geography, with applicable adjustments. Ask the payer to document its calculation.

Does the floor pay masters-level therapists less than psychologists?

Do not automatically apply a therapist-specific Medicare reduction to the Illinois floor. IDOI’s September guidance specifies the medical/surgical clinician benchmark for the service, date and location with applicable adjustments. This replaces the alternative provider-percentage scenarios in our August version; request the payer’s actual methodology before relying on a dollar estimate.

Will my rates go up automatically in 2027?

Not automatically. The floor applies to covered plans as they are issued, amended, or renewed on or after January 1, 2027, and actual impact depends on the plan type, your contract, the service and code, and implementation details. Practices that know their current allowed amounts will be in the best position to spot and pursue the difference.

Sources

• Illinois General Assembly bill status for HB 1085

• Illinois General Assembly Public Act 104-0446

• NASW-IL summary of HB 1085

• IDOI: September 11, 2026 implementation guidance

• CMS Physician Fee Schedule search tool

• Illinois Health and Hospital Association memo on the behavioral health insurance reform package