Chiropractic insurance billing in Illinois.

Original Medicare Part B covers medically necessary manual spinal manipulation to correct a subluxation (CPT 98940 to 98942). Use the AT modifier for active or corrective treatment; the modifier alone does not establish medical necessity.

For a usually covered service expected to be denied in a particular case, such as spinal manipulation that has become maintenance care, a valid ABN is required before treatment to transfer potential financial liability to the patient. Exams, X-rays and therapies performed by a chiropractor are statutorily excluded from this benefit; an ABN for those services is voluntary. Medicare Advantage uses separate plan coverage and notice procedures, not the Original Medicare ABN. See CMS guidance on advance notices and our chiropractic Medicare billing guide.

Original Medicare Part B claims in Illinois are processed by National Government Services (J6). Check its applicable Local Coverage Determination and documentation requirements for the date of service.

Carriers listed for Illinois include Blue Cross Blue Shield of Illinois (HCSC); UnitedHealthcare; Aetna (CVS Health); Cigna; Humana; Centene/Meridian. Check the member’s product, network, claim destination and applicable chiropractic policy.

Chiropractic benefits can be administered by the health plan or a delegated specialty network such as American Specialty Health (ASH) or Optum. Confirm network participation, any treatment-plan review, and the claim destination separately for the member’s product.

An authorization delegated to a vendor does not by itself mean the claim is sent to that vendor. ASH requirements follow the applicable Client Summary and provider agreement. For services on or after October 1, 2026, UnitedHealthcare’s Medicare Advantage reduction table removes prior authorization for 98940-98942, subject to product-specific exceptions.

These codes do not appear in the separate D-SNP reduction table. Check the member’s product and billed code; commercial and other therapy requirements are separate.

BCBSIL's CMT policy includes the brief pre-manipulation assessment. A separately identifiable E/M requires clinical documentation and the appropriate modifier; a routine brief assessment is not a separate office visit. Member products control covered visits and review requirements; check the applicable benefit and authorization instructions.

Confirm claim routing separately from authorization routing. For services on or after October 1, 2026, UnitedHealthcare's Medicare Advantage reduction table removes prior authorization for 98940-98942, subject to product-specific exceptions.

These codes do not appear in the separate D-SNP reduction table. Check the member's product and billed code; commercial and other therapy requirements are separate. Original Medicare Part B covers medically necessary manual spinal manipulation to correct subluxation (98940-98942); use AT for active/corrective care.

Maintenance care is not covered: a valid ABN before expected medical-necessity denial is required to transfer liability, with GA or GZ as appropriate. Exams, X-rays and therapies furnished by a chiropractor are statutorily excluded; an ABN for excluded services is voluntary and GY identifies the exclusion.

Medicare Advantage may offer supplemental benefits and uses its own coverage, authorization and notice procedures, rather than the Original Medicare ABN. HFS Medicaid covers manual spinal manipulation for subluxation for all ages, with managed-care administration governed by the member's plan.

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).

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.

Original Medicare fee-for-service claims generally must be received within 12 months of service, with limited CMS exceptions. National Government Services (J6) processes the state's Part A/B claims. Medicare Advantage filing periods follow the member plan and provider agreement.

Original Medicare's chiropractic benefit is medically necessary manual spinal manipulation to correct subluxation; Medicare Advantage may offer additional covered services.

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.

Local-public-entity or employee actions generally have a one-year limitation under 745ILCS10/8-101, with statutory exceptions. The former general six-month written-notice provision in Section 8-102 is repealed. Confirm each MedPay policy’s notice/submission terms.