Chiropractic insurance billing in Delaware.

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 Delaware are processed by Novitas Solutions (JL) — its Local Coverage Determination and documentation expectations (and its audits of the AT modifier and medical necessity) are the ones your Delaware claims are measured against.

A Delaware chiropractic or multi-specialty practice spends most of its commercial billing day with: Highmark Blue Cross Blue Shield Delaware; AmeriHealth Caritas Delaware; Aetna (CVS Health); UnitedHealthcare; Cigna; Ambetter (Delaware First Health).

Each has its own claim portal, fee schedule, and chiropractic medical-policy quirks.

Two delegated musculoskeletal/chiropractic network managers operate in Delaware.

• American Specialty Health (ASH) administers chiropractic (and often acupuncture/PT) benefits for Aetna HMO members in the Mid-Atlantic — ASH has administered Aetna HMO chiropractic across Delaware, Pennsylvania and Virginia, and ASH lists Delaware among its active states; it also has historic relationships with Cigna and Anthem/BCBS lines. When a plan delegates to ASH, network enrollment, treatment-plan/prior-auth submission, and claims route to ASH (ashlink.com), NOT to the health plan.
• Optum / Optum Physical Health (UnitedHealth Group) manages chiropractic and outpatient therapy for UnitedHealthcare. Since Sept 1, 2024 UHC requires prior authorization for chiropractic/PT/OT/ST for Medicare Advantage members (initial evaluation exempt; the treatment plan/visit count needs auth), with reviews delegated to Optum and submitted via the UHC Provider Portal/Optum systems (as of Jan 2025 UHC allows up to ~6 follow-up visits after the initial eval before clinical review). IMPORTANT for Delaware: the dominant commercial payer is Highmark Blue Cross Blue Shield Delaware (~52% commercial market share), which generally manages chiropractic under its OWN medical policy (e.g., Highmark policy Y-9 / chiropractic manipulation) rather than carving it out to ASH — so most Highmark chiropractic auths/claims go to Highmark, not a delegate. Always verify on the member’s card/portal whether chiropractic is carved out to ASH or Optum, because that determines where authorizations and claims go; delegation arrangements change, so re-confirm per plan/product.

What trips up chiropractic billing in Delaware:

• Delaware’s chiropractic-reimbursement MANDATE — 24 Del. C. 716 (effective for policies issued/renewed on or after Jan 1, 2022) requires carriers to reimburse chiropractor-provided services at no less than the Medicare rate for comparable services, bars annual and lifetime DOLLAR/visit limits on chiropractic treatment of the spine, bars denial of supportive/ongoing spinal care solely by labeling it ‘maintenance therapy,’ and caps member cost-share at no more than 25% of the chiropractor’s fee. This is a powerful, state-specific protection (note it excludes accident-only, specified-disease, hospital-indemnity and Medicare-supplement policies, and does not override Medicare/Medicaid program rules).
• Highmark BCBS Delaware (dominant commercial payer) — requires chiropractic manipulation (e.g., 98940) to be medically necessary for an acute neuromusculoskeletal condition/reinjury/aggravation under an ongoing WRITTEN treatment plan with periodic re-eval; maintenance/repetitive ‘maintain function’ care is not reimbursable (subject to the 24 Del. C. 716 carve-back for in-scope plans); plans cap reimbursement at up to ~4 codes/units per date of service per provider; prior authorization can apply to chiropractic manipulation on some products/plan years (e.g., State of Delaware PPO lists chiropractic preauthorization with high annual visit allowances) — verify per product.
• Medicare/Medicare Advantage — spinal CMT (98940-98942) must carry the AT modifier for active/corrective treatment; routine ‘maintenance’ manipulation is non-covered; UHC/Optum MA now requires prior auth for the treatment plan (initial eval exempt).
• Delaware Medicaid — chiropractic is covered (added 1/1/2018 as an MCO benefit) but tightly limited: MANUAL spinal manipulation ONLY (98940-98942), one manipulation per member per day, MAXIMUM 20 manipulations per calendar year, spinal x-ray limited to one set per 12 months and only to document subluxation, exam once per 12 months; non-covered = maintenance therapy, acupuncture, physiotherapy modalities (diathermy/ultrasound), chiropractor-prescribed orthopedic devices, hand-held device charges, and anything outside subluxation/low-back-pain treatment (DMAP Practitioner Manual sec. 13). MCOs (AmeriHealth Caritas DE, Highmark Health Options, Delaware First Health) administer this with their own reimbursement policies and prior-auth rules.
• Carve-out routing — sending an Aetna-HMO chiropractic claim/auth to Aetna instead of ASH, or a UHC-MA one to UHC instead of Optum, is a frequent denial cause; confirm the delegated administrator before submitting. Not legal advice — verify benefits and current rules per payer.

Largely contract/payer-set, not fixed by a Delaware statute. The common initial-claim filing window for commercial/private payers runs roughly 90-180 days from the date of service (e.g., many Highmark/Aetna/Cigna commercial plans use ~90-180 days; confirm the exact number in your participating-provider agreement or the payer’s provider manual, since it can be shorter or longer by plan and product).

Delaware context: the state’s prompt-pay law, 18 Del. C. 2304(16)/the Health Insurance Claims (HICA) framework and 18 Del. Admin. Code 1310, governs how fast the INSURER must adjudicate/pay a clean claim (generally pay or deny within 30 days for electronic clean claims / 45 days for paper, with interest on late payment); it does NOT set the provider’s SUBMISSION deadline, which remains contractual.

Note the Delaware chiropractic-specific mandate at 24 Del. C. 716 (Medicare-rate floor, no annual/lifetime cap on spinal treatment) — see payerNuance.

Federal limit: generally 12 months (one calendar year) from the date of service to submit an initial Medicare fee-for-service claim. This is set by the Social Security Act (Sec. 1842(b)(3)(B)) and CMS, not by Delaware. Medicare Advantage plans set their own contractual filing deadlines (often up to ~12 months) — confirm per plan.

Delaware Medicaid (DMAP/DMMA fee-for-service): 12 months (one year) from the date of service to submit an initial claim, per the DMAP General Policy Manual section 1.19 (‘Claims Submission-Timeliness’: ‘It is a federal requirement that claims to DMAP be submitted no later than twelve months from the date of service’).

Key sub-rules: for a Medicare-crossover or other-primary-insurance claim submitted timely to the primary, DMAP allows up to 6 months after the provider receives notice of the primary’s disposition even if that is more than 12 months from the date of service (sec. 1.19.1.1); a paid claim may be ADJUSTED up to 2 years from the date of service (sec. 1.19.3); the POS-DUR pharmacy claim window is 100 days (sec. 1.19.1.2).

NOTE: Delaware Medicaid is ~85% managed care, and the three MCOs set their OWN (shorter) windows — e.g., AmeriHealth Caritas Delaware: 120 days from date of service for initial claims, 365 days for resubmissions/corrections, and 60 days from the primary insurer’s EOB date for COB claims.

Highmark Health Options and Delaware First Health have their own deadlines; bill the MCO’s window (often 120 days), not the 12-month FFS limit, for managed-care members.

Delaware Workers’ Comp does not pin a single hard ‘days-from-service’ provider SUBMISSION cutoff in statute; 19 Del. C. 2322F (the health care payment system) instead governs PAYMENT timing: the employer/carrier must pay a health care invoice within 30 days of receipt as long as it contains substantially all required data elements, unless contested in good faith, with interest at 1% per month on late-paid invoices (a contested bill on an acknowledged compensable claim must be referred to utilization review within 15 days of denial).

Practical note: providers must be CERTIFIED under the Delaware Health Care Payment System to be paid at the fee-schedule rate, must bill per the Delaware practice guidelines/fee schedule, and should submit promptly (commonly within ~1 year) and per the carrier’s instructions.

The injured worker’s underlying claim petition is separately bound by the 2-year limitation in 19 Del. C. 2361. Confirm each carrier’s specific bill-submission timeframe.

Delaware is a no-fault/PIP state (21 Del. C. 2118): every Delaware auto policy carries Personal Injury Protection that pays reasonable/necessary medical expenses regardless of fault. Unlike most states, Delaware DOES have a statutory bill-submission rule:

PIP medical expenses must be submitted to the insurer ‘as promptly as practical and in no event more than 2 years after they are received by the insured/provider’ (21 Del. C. 2118(a)(2)). Expenses must also be incurred within 2 years of the accident date (with a narrow written-verification exception for surgical/dental procedures that could not be done within the 2-year window).

Practical norms: file the PIP application and bill the auto carrier promptly to preserve coverage; once PIP limits exhaust, coordinate with health insurance/MedPay or present on a third-party liability/lien basis at settlement (the bodily-injury tort claim is bound by Delaware’s 2-year personal-injury statute of limitations, 10 Del.

C. 8119). Confirm each policy’s notice/application terms.