Illinois 90837 Rates: Is 2027 Still on Track?

Yes—Illinois’s 2027 therapy reimbursement increase still looks on track, and there is more concrete evidence than when we first wrote about it. The Illinois Department of Insurance (IDOI) issued implementation guidance on September 11, 2026. BCBS Illinois and Aetna have also posted notices about the coming change. Those are meaningful steps toward implementation, not proof of what every therapist will receive.

For therapists billing CPT 90837, the longer individual psychotherapy session, the practical answer is: higher allowed rates look likely where a qualifying plan currently pays below the new floor—but do not budget for a universal January 1 raise. The patient’s policy, your network participation and the applicable rate calculation still matter. A rate already above the floor does not automatically have to increase. IDOI implementation guidance.

Part 2 • Checked October 19, 2026. This is a commercial-insurance and specified public-employer-plan update, not an Illinois Medicaid rate increase. General education, not legal advice or a promise of payment.

What changed since our first article?

Our original Illinois 90837 article explained why HB 1085, now Public Act 104-0446, could materially improve therapy reimbursement. The new evidence is about how that law will be put into practice:

• September 11: state instructions. Company Bulletin 2026-12 explains plan eligibility, timing, the benchmark calculation and payer obligations.

• September 14: BCBS Illinois notice. BCBSIL tells participating behavioral-health providers their reimbursement may change and says no action is needed on their part.

• Now posted: Aetna notice. Aetna’s Illinois section says participating providers’ reimbursement may differ from contracted rates for applicable plans amended, delivered, issued or renewed on or after January 1, 2027. The notice does not display a publication date; we checked it October 19.

Our read: this is no longer just a signed law waiting for anyone to acknowledge it. The regulator has explained implementation, and two insurers are communicating about payment changes. Neither payer notice supplies an official 2027 dollar rate for 90837 or promises an increase for every product.

What did Illinois clarify about the rollout?

The September bulletin, pages 2–7 resolves several questions that mattered in our earlier coverage:

• Timing follows the patient’s policy—not your provider contract. Requirements attach to qualifying policies amended, delivered, issued or renewed on or after January 1, 2027.

• An old fee schedule is not a postponement. A below-floor provider fee schedule does not defer the obligation to meet an applicable floor.

• Do not wait for a complete state rate table. IDOI says it does not intend to publish a complete set of dollar floors. That updates the expectation described in our first article.

• The multiplier is confirmed at 141.7%. For professional services, use the appropriate Medicare fee-for-service medical/surgical clinician benchmark for the same code, date and geography, with applicable adjustments.

In plain English: the percentage is settled in this guidance, but you still need the right starting number. Our earlier $174.18 example was illustrative—not an official statewide 2027 floor. Do not simply multiply the Medicare payment you personally received by 1.417 and assume that settles the question.

Which patient plans should therapists check?

IDOI identifies qualifying Illinois-regulated PPO-type policies and certain self-funded Illinois county, municipal and school-district employee plans. HMOs, Medicaid/All-Kids, Medicare, other self-funded plans and qualifying out-of-state group policies are excluded. Plan applicability, pages 1–2. This is a practical summary, not an exhaustive coverage determination.

The public-employer exception matters. Our earlier coverage treated self-funded plans too broadly as excluded. If your client works for an Illinois school district, municipality or county, “self-funded” alone is not enough information to dismiss the possibility. Conversely, an Illinois address and a familiar insurer logo do not establish that a plan qualifies.

Why might two clients see different timing?

Imagine two clients with the same insurer on their cards. Both have qualifying policies and see the same in-network therapist for 90837. This is a hypothetical example, not a description of particular member benefits:

• Client A: the policy renews January 1, 2027. That is the relevant starting point for the new requirements.

• Client B: the policy renews July 1, 2027, with no earlier qualifying policy event. Its required implementation date can be later in the year.

That distinction follows IDOI’s timing examples on page 5. Your provider agreement renewing in October is a different event. Do not accept “your contract has not renewed” as a complete explanation for a low rate on a policy already subject to the floor.

For practice finances: build any revenue forecast from the sessions actually covered, not your entire caseload. If only a portion of your clients qualify, an exciting per-session increase can still translate into a much smaller practice-wide change. Keep anticipated increases separate from cash already collected before committing to new fixed expenses.

What if you bill through Alma, Headway or another platform?

IDOI’s third-party and provider guidance, pages 2–3 includes relevant benefit administrators and indirect participating-provider contracts when the underlying plan qualifies. A third party’s involvement is not an automatic exemption.

But that does not establish what any particular platform will pay you. Ask how it will identify qualifying patient plans, apply the floor, explain any fees or adjustments, and show the amount paid to the treating practice. We have not verified a platform-specific 2027 payout promise for this article. Keep insurer claim reimbursement and your own contractual payout distinct.

What should therapists do before January?

BCBSIL’s notice says no action is needed from existing network providers. The following is our suggested preparation—not a new enrollment requirement or a reason to renegotiate every contract:

1. Sort the caseload by actual plan. Record the product, funding arrangement, policy state, relevant policy date and your participation status. Mark unknowns as unknown rather than guessing from the card.

2. Ask for a written explanation. “Is this policy subject to Section 370c.4? From what date? What benchmark and adjustments will you use for my 90837 claims?” Save the response with the applicable fee schedule.

3. Keep a before-and-after record. Save representative remittances showing code, date of service, allowed amount, insurance payment and patient responsibility. Compare allowed rates, not just bank deposits.

4. Review the first affected 2027 claims. Check the payer’s actual calculation against the appropriate benchmark and effective date. Ask for claim-specific review when the result appears inconsistent, and preserve filing and appeal deadlines.

For a suspected compliance problem, IDOI offers a provider complaint process. Keep the claim, plan information, calculation and payer response together. A complaint is an escalation path, not a guaranteed recovery or a substitute for preserving payer appeal deadlines.

What would confirm that the increase has reached your practice?

Look for three things together: a plan-specific implementation explanation, a defensible rate calculation, and an affected claim processed consistently with them. A newsletter is encouraging; it is not a remittance.

As of this October check-in, 2027 payment outcomes are still ahead of us. Our conclusion is grounded in the state bulletin and payer notices, not a claim that every implementation issue has been resolved or every practice will benefit. Prepare for the change. Verify where it applies. Count the improvement when the claims support it.

Where Bomi fits

Shameless Bomi plug: if you would rather spend your time with clients than track down why one payer’s remittance does not match its explanation, that is the administrative work Bomi Billing helps practices manage: claims, EOB entry, denials and payer follow-up. We cannot make an excluded plan qualify or promise a particular rate, but we can help keep the paperwork and follow-through organized.

Sources and related coverage

• IDOI: Company Bulletin 2026-12, September 11, 2026

• BCBS Illinois: HB 1085 provider notice, September 14, 2026

• Aetna: Illinois notice on its state regulations page, checked October 19, 2026

• IDOI: complaint information

• Part 1: Illinois 90837 rates and illustrative reimbursement math

• Illinois HB 1085: practice preparation and credentialing