Chiropractic insurance billing in Illinois.

Medicare’s chiropractic rules are federal — the same in every state. Medicare Part B covers ONLY manual manipulation of the spine to correct a subluxation (CPT 98940–98942), and ONLY when the care is active or corrective — which you signal with the AT modifier. Maintenance care, exams, X-rays, and any therapies performed by a chiropractor are not covered, so a properly executed ABN is essential before non-covered services. The full federal rules are in our chiropractic Medicare billing guide.

Part B claims in Illinois are processed by National Government Services (J6) — its Local Coverage Determination and documentation expectations (and its audits of the AT modifier and medical necessity) are the ones your Illinois claims are measured against.

A Illinois chiropractic or multi-specialty practice spends most of its commercial billing day with: Blue Cross Blue Shield of Illinois (HCSC); UnitedHealthcare; Aetna (CVS Health); Cigna; Humana; Centene/Meridian. Each has its own claim portal, fee schedule, and chiropractic medical-policy quirks.

Illinois is a partially ‘carved-out’ chiropractic market — some big plans delegate chiropractic/physical-medicine benefits to a specialty network manager (which changes where credentialing, prior auth/treatment plans, and CLAIMS go), while others (notably BCBSIL) administer chiropractic directly. The two managers that matter:

• American Specialty Health (ASH / ashlink.com) — ASH operates in Illinois and is the delegated administrator for CIGNA chiropractic in Illinois (Cigna expanded/continued its ASH delegation in Illinois around its Sept 1, 2023 rollout). When a plan is carved out to ASH, network enrollment, treatment-plan/medical-necessity review, prior auth, and claims route to ASH via ASHLink — NOT to the health plan — and ASH imposes its own utilization gates (e.g., medical-necessity review forms; pre-authorization commonly kicks in after an initial visit block such as ~26 visits). NOTE: ASH’s larger national footprint is for PT/OT and acupuncture as well as chiropractic, and ASH relationships shift — e.g., Aetna’s Illinois chiropractic ran through ASH until 12/31/2014 and moved to a DIRECT Aetna agreement effective 1/1/2015, so do not assume Aetna IL chiropractic is carved out to ASH today.
• Optum / Optum Physical Health (a UnitedHealth Group company) — manages UnitedHealthcare’s chiropractic/physical-health utilization in Illinois; effective Sept 1, 2024 UHC requires prior authorization (delegated to Optum Physical Health, reviewed under CMS Ch. 15 / LCDs / InterQual) for chiropractic and outpatient therapy for Medicare Advantage members — the initial evaluation is exempt, but the treatment plan/number of visits needs auth (and if auth isn’t obtained within ~10 days of starting care the claim can be denied with no balance-billing the member). BCBSIL: by contrast administers chiropractic directly under its own ‘Chiropractic Services’ clinical payment/coding policy (CPC016) — most BCBSIL plans dropped routine chiropractic prior auth effective 1/1/2021. ALWAYS verify on the member’s card/portal whether chiropractic is carved out to ASH or Optum (and to which entity) before submitting — misrouting a carved-out claim to the health plan instead of the delegate is a leading Illinois denial cause.

What actually trips up chiropractic billing in Illinois:

• Routing / carve-out confusion — Cigna chiropractic runs through ASH (ASHLink), UnitedHealthcare runs chiropractic utilization through Optum Physical Health, but BCBSIL administers chiropractic directly; sending an ASH/Optum claim or auth to the health plan (or vice-versa) is a common denial. Confirm the delegate per member before submitting.
• BCBSIL specifics — BCBSIL (the dominant IL commercial payer) generally does NOT require prior authorization for chiropractic on most plans as of 1/1/2021, but HMO products (Blue Precision HMO, BlueCare Direct) carry visit caps (e.g., a 25-visit chiropractic/osteopathic manipulation limit) and some group plans require Telligen preauth for PT after the 7th visit. BCBSIL also treats CMT (98940-98943) as INCLUDING a brief pre-manipulation assessment, so a same-day office/outpatient E/M (99202-99215) is generally bundled unless it is a separately identifiable service (new patient, new injury, exacerbation, or a periodic re-evaluation) — use modifier -25 appropriately or expect the E/M to be denied/bundled.
• ASH/Optum treatment-plan gating — carved-out plans front-load clinical documentation: an initial treatment plan, periodic re-evaluation, and a clear active/corrective-vs-maintenance distinction (maintenance care is non-covered); ASH typically requires a medical-necessity review form and pre-auth after an initial visit block (~26 visits), and Optum applies InterQual/CMS Ch. 15 review for UHC MA.
• Medicare/MA modifiers + prior auth — expect the AT (active treatment) modifier on Medicare/MA spinal CMT (98940-98942), correct GA/GY/GZ and -59/-XU usage; remember Medicare covers ONLY manual spinal manipulation by a chiropractor (no exams, x-rays, therapies billable to Part B), and UHC/Optum MA now requires prior auth for the chiropractic treatment plan (initial eval exempt).
• No broad Illinois commercial chiropractic mandate — Illinois does not impose a sweeping statutory commercial chiropractic-benefit mandate, so coverage, visit caps, and re-eval rules are plan-by-plan; Illinois Medicaid (HFS) covers chiropractic narrowly (limited manipulation benefit) and HealthChoice MCO rules vary. Verify benefits and current rules per payer. Not legal advice.

Largely contract/payer-set — Illinois has no statute that fixes a minimum INITIAL-claim submission window for commercial/private payers, so the deadline is whatever the participating-provider agreement or payer manual specifies. In practice the dominant Illinois commercial deadline is 180 days from the date of service:

Blue Cross and Blue Shield of Illinois (BCBSIL) — by far the largest IL commercial payer — requires participating PPO, Blue Choice PPO and Blue HPN providers to file within 180 days of the date of service/discharge (and 180 days for its Medicare Advantage and Medicaid plans).

Other commercial payers commonly run 90-180 days for in-network and up to 12 months for some plans — always confirm the exact window in your contract. Illinois prompt-pay/clean-claim context (how fast the PLAN must pay YOU, not your submission deadline): under the Illinois Prompt Payment provisions of the Insurance Code (215 ILCS 5/368a), insurers, HMOs, managed-care plans, PPOs and TPAs must pay a clean/properly-documented claim within 30 days of receipt of due written proof of loss, must notify the provider within 30 days of any known documentation deficiency, and owe interest at 9% per year from the 30th day to the date of late payment.

As of 2025-2026; verify per payer and contract.

Federal limit: generally 12 months (one calendar year) from the date of service to submit an initial Medicare fee-for-service claim. Set by the Social Security Act (1842(b)(3)/1835(a)) and CMS, not by Illinois. Medicare Advantage plans set their own deadlines (often similar, up to ~12 months — BCBSIL MA, for example, uses 180 days) — confirm per plan.

Illinois Medicaid (HFS / Illinois Department of Healthcare and Family Services): the standard timely-filing limit for non-institutional providers is 180 DAYS from the date of service, and this applies to both initial and re-submitted claims, per the HFS ‘Timely Filing Claim Submittal for Non-Institutional Providers’ guidance.

Key exceptions: Medicare crossover claims and Medicare-denied claims = 2 years from the date of service; Third Party Liability (TPL) = 180 days after final adjudication by the primary payer; retroactive participant eligibility = 180 days from the Department’s system update; new provider enrollment/re-enrollment = the 180-day clock starts when the enrollment/update is recorded on the provider file; replacement/void-and-rebill = 12 months from the original paid voucher date; large local-government providers (population >3,000,000) = 12 months;

Local Education Agencies = 18 months. Illinois Medicaid MANAGED-CARE (HealthChoice Illinois MCOs — e.g., Meridian, Blue Cross Community Health Plans, Aetna Better Health, Molina, CountyCare) set their own timely-filing windows in their provider agreements — commonly 180 days — so confirm with the specific MCO.

Illinois Workers’ Comp: the Illinois Workers’ Compensation Act (820 ILCS 305) does NOT set a fixed statutory deadline for a provider to SUBMIT its medical bill — there is no hard timely-filing cutoff for WC medical bills the way there is for Medicaid/Medicare.

The Act’s clock runs on the PAYER side: under Section 8.2(d) (820 ILCS 305/8.2), the employer/insurer must pay (or, if denying, give written notice of the basis and any missing data elements) within 30 days of receiving a bill that contains substantially all the required data elements (1% per month interest accrues on overdue amounts; this 30-day rule took effect June 28, 2011, replacing a prior 60-day rule).

Bills must be submitted on standardized forms electronically or on paper per Section 8.2a. PRACTICAL norm: submit promptly — the absence of a submission deadline does NOT make a bill collectible forever; payment ultimately depends on compensability of the underlying claim, the carrier/TPA’s e-billing rules, and the broader limitations on the employee’s WC claim.

Confirm each carrier/TPA’s billing instructions; not legal advice.

Illinois is an at-fault (tort) state with NO no-fault/PIP system — the optional first-party medical coverage is MedPay (Medical Payments), which is purely contractual; PIP is not standard/required in Illinois. There is NO fixed Illinois statutory deadline to submit medical bills to an auto carrier; any bill-submission/notice timeframe is set by the individual auto policy (MedPay policies typically require prompt/reasonable notice and submission of bills, often for treatment within ~1-3 years, per policy terms) — submit promptly per the policy.

Practical norms: bill MedPay and/or the patient’s health insurance promptly to preserve coverage; the underlying third-party (liability) personal-injury claim is governed by Illinois’s 2-year personal-injury statute of limitations (735 ILCS 5/13-202), so on a lien/third-party-liability basis bills are commonly presented at settlement within that window.

Note a shorter 1-year deadline plus 6-month written-notice requirement applies if a government entity/municipality is involved (745 ILCS 10/8-101). Confirm each MedPay policy’s notice/submission terms.