Chiropractic insurance billing in Vermont.

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

A Vermont chiropractic or multi-specialty practice spends most of its commercial billing day with: Blue Cross and Blue Shield of Vermont; MVP Health Care; Cigna; UnitedHealthcare; Vermont Medicaid (Green Mountain Care); Medicare. Each has its own claim portal, fee schedule, and chiropractic medical-policy quirks.

Vermont’s dominant commercial carrier, Blue Cross and Blue Shield of Vermont (BCBSVT), manages chiropractic IN-HOUSE – it does NOT delegate chiropractic to American Specialty Health (ASH) or Optum. BCBSVT applies its own Chiropractic Services medical policy (8.03.VT203), and prior approval, medical-necessity review, and claims go directly to BCBSVT (via its Prior Approval process), not to a third-party network manager. For the national carriers that operate in Vermont, the delegated managers do apply:

• American Specialty Health (ASH / ASHLink, ashlink.com) is ASH’s delegated chiropractic/physical-medicine network manager nationally for Cigna and Aetna (and Anthem BCBS in many states); ASH lists Vermont as an active state, so for Cigna/Aetna members whose chiropractic benefit is delegated to ASH, credentialing, treatment-plan/medical-necessity review, prior authorization, and often claims route to ASH rather than the carrier.
• Optum Physical Health (OptumHealth Care Solutions, myoptumhealthphysicalhealth.com) administers chiropractic/physical-medicine utilization management for UnitedHealthcare – and since 9/1/2024 UHC/Optum requires prior authorization of the chiropractic treatment plan (number of visits) for outpatient therapy and Medicare-covered chiropractic (AT-modifier) services on UHC Medicare Advantage, with the initial evaluation and (since 1/13/2025) the first 6 visits within 8 weeks not requiring clinical review. Practical impact: for ASH- or Optum-managed plans, auths and often claims go to the delegated manager, NOT the carrier; for BCBSVT (the largest Vermont payer) they go to BCBSVT. ALWAYS verify each patient’s plan/product to confirm whether chiropractic is delegated and to whom before submitting auths or claims.

Dominant Vermont commercial payers are Blue Cross and Blue Shield of Vermont (BCBSVT, by far the largest, including the State of Vermont employee plan and many ASO/self-funded groups), MVP Health Care, Cigna, Aetna, and UnitedHealthcare. The big chiropractic gotcha is BCBSVT’s visit cap and prior-approval rule (Medical Policy 8.03.VT203):

• Prior approval is required for the 13TH visit forward per plan year – the first 12 chiropractic visits per plan year are allowed without prior approval, but the 13th and beyond require an approved Prior Approval Request with clinical documentation of medical necessity; after approval, no more than 6 additional visits are allowed without a clinical update of the member’s status.
• Combined therapy limit/visit counting – physical therapy therapeutic procedures (CPT 97110-97535) billed by anyone, including a chiropractor, apply to the member’s combined PT/OT/ST benefit limit AND count against the 12 chiropractic visits; this double-counting trips up clinics that bill PT codes alongside manipulation.
• Daily units & modifiers – a chiropractic visit may include up to FOUR timed units per day (not counting E/M or manipulation codes); modifier -GP must be reported when physical-medicine treatment services are provided under a chiropractic plan of care; use modifier -52 for timed services under 8 minutes; the 8-22 min = 1 unit timed-code rule applies.
• Documentation/re-eval – BCBSVT requires a documented treatment plan with quantifiable short-term goals and outcome measures (e.g., QuickDASH) and periodic re-evaluation to justify continued care; stale or missing treatment plans are a common denial driver.
• Maintenance/wellness care is non-covered (self-pay agreement required; may be reported as S8990) – active, restorative treatment with documented functional improvement is required.
• Medicare/UHC-Optum – for Medicare and UHC Medicare Advantage, only manual manipulation to correct a subluxation (98940-98942) is covered, the AT modifier is required for active/corrective treatment, maintenance is non-covered (GA/GY/GZ as appropriate), and UHC/Optum requires prior authorization of the treatment plan beyond the initial eval and first 6 visits. Vermont licenses chiropractic under 26 V.S.A. Sec. 521 and applies its insurance mandates to non-ASO plans, but BCBSVT notes ASO/self-funded groups are not required to follow Vermont legislative mandates, so benefits vary by group. The most common Vermont chiropractic billing failures: blowing the short 180-day Medicaid filing window, hitting the BCBSVT 12-visit cap without an approved prior-approval request, the PT-code/visit double-counting, missing the -GP modifier, and billing maintenance care as active treatment. Verify visit limits, modifier, and PA rules per the member’s specific plan before each course of care.

Largely contract/payer-set, not fixed by Vermont statute. The common initial-claim filing window for commercial/private payers in Vermont runs roughly 90 to 180 days from the date of service (many plans use 90, 120, or 180 days; some allow up to 12 months) – always confirm the exact limit in the specific payer agreement, provider manual, or member plan, because it varies by payer and product.

Vermont’s prompt-pay framework (18 V.S.A. Sec. 9418 and DFR Rule H-2008-04, Health Insurance Claims Administration) governs the OTHER direction: once a payer receives a clean claim, it generally must pay or deny within 30 days, with interest on late payment – but it does NOT set the provider’s filing deadline.

As of 2025-2026; confirm per payer.

Federal limit: 12 months (one calendar year) from the date of service, per Section 6404 of the Affordable Care Act and 42 CFR 424.44 (also Social Security Act Sec. 1842(b)(3)(B)). This applies in Vermont as in every state (Medicare Part A/B is administered for Vermont by the MAC, National Government Services / Jurisdiction K).

Claims filed after one year are denied and that denial is generally not appealable except for narrow CMS-defined exceptions (administrative error, retroactive entitlement/eligibility, etc.). Medicare Advantage plans set their own (usually similar) limits by contract.

Vermont Medicaid (Green Mountain Care / DVHA, fiscal agent Gainwell) is SHORT: Medicaid-primary claims must be RECEIVED within 180 days from the begin date of service (inpatient claims: 180 days from the discharge/through date). This is materially shorter than the one-year limit many states use.

Exceptions extend to 365 days from the date of service: (a) when Other Insurance (excluding Medicare) is primary, and (b) when a provider is granted retroactive enrollment or a member is granted retroactive eligibility. Medicare-primary (dual-eligible crossover) claims must be received within 180 days from Medicare’s processing date.

If a provider first bills workers’ comp/auto and that claim is denied, the provider then has 1 year from the date of service to bill Vermont Medicaid. Timely-filing reconsideration requests must be received within 90 days of the initial timely-filing denial, and are granted only for exceptional circumstances beyond the provider’s control.

Basis: Vermont Medicaid General Billing and Forms Manual, Section 3.3 Timely Filing. Confirm current manual; as of 2025-2026.

Vermont Workers’ Compensation sets a PROVIDER-side bill-submission deadline by statute: under 21 V.S.A. Sec. 640a(f)(1), a health care provider must submit a medical bill (with supporting medical documentation) to the employer or insurance carrier within SIX

• months after the date the provider had actual knowledge that the services were related to a workers’ comp claim. IMPORTANT: failure to submit within six months does NOT bar payment unless the employer/carrier is prejudiced by the delay, and the Commissioner may extend the six-month limit for circumstances outside the provider’s control (21 V.S.A. Sec. 640a(f)(3)). Separately, the employer/carrier must pay or provide written notice contesting/denying the bill within 30 days of receipt (21 V.S.A. Sec. 640a(a) and WC Medical Fee Schedule Rule 40.021(C)), with 12% per annum interest on overdue bills. Best practice: submit promptly and well within 6 months. Confirm current statute/rule.

Vermont has NO fixed statutory deadline for submitting auto medical bills (no no-fault/PIP filing deadline). Vermont is an at-fault (tort) state and does NOT mandate no-fault PIP; first-party auto medical coverage is Medical Payments (Med-Pay), which insurers must OFFER but the insured may decline.

Bill-submission timeframes for Med-Pay are set by the auto policy/contract, not statute – the practical norm is to submit promptly under the policy’s notice/proof-of-loss terms (many policies require proof of loss within a set period, e.g. as soon as reasonably possible, and bar suit unless brought within one year of the loss).

For bills paid through a third-party (at-fault) liability claim there is no per-bill filing deadline, but the underlying personal-injury claim is governed by Vermont’s 3-year statute of limitations (12 V.S.A. Sec. 512). Confirm per policy.