Guide

Work comp and auto: different payers, different rules entirely

Summary

Workers' comp and auto liability aren't health insurance: they're state-regulated indemnity systems with their own fee schedules, no standard electronic eligibility check, and no ERISA coverage. A claim is verified with an adjuster and a claim number, not a card and a 270/271 transaction. Authorization runs through case management and state utilization review, not a payer's prior-auth department. And when Medicare is involved, it's usually as a secondary payer recovering a conditional payment, not the primary insurer paying the claim.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

Why workers' comp and auto liability aren't health insurance at all

Workers' compensation and auto liability (including MedPay and no-fault PIP) are not health insurance — they're state-regulated indemnity systems that pay for care related to a specific injury event, governed by workers' comp statutes and auto insurance law, not the ACA or the rules that shape a commercial health plan. That distinction is the source of nearly every practical difference: no member card, no standard network, no eligibility transaction, and often no prior-authorization department at all.

The mental health parity rules under MHPAEA parity, for example, apply to health insurance — they don't reach a workers' comp carrier or an auto liability adjuster deciding what behavioral health care an injury claim will cover, because neither one is a health plan to begin with.

There's no 270/271 eligibility check — verify with the adjuster instead

Running a standard eligibility transaction against a workers' comp or auto liability payer usually returns nothing, because CAQH CORE's operating rules govern the 270/271 transaction for health plans, not for indemnity carriers handling a single injury claim 1Ref 1CAQH (2026).CAQH CORE Operating Rules.That CAQH CORE's 270/271 eligibility operating rules govern health plans, which is why the same standard eligibility transaction does not reach workers' comp or auto liability carriers.. Verification here means calling or emailing the assigned adjuster, confirming the claim number, the date of injury, and — for workers' comp — that the claim has actually been accepted, not just filed.

An accepted claim number is the closest equivalent to an active member ID; a claim that's been reported but not yet accepted can still deny every bill submitted against it, no differently than billing an inactive health plan.

Fee schedules and authorization run through the state and the adjuster

Most states set their own workers' compensation fee schedule, entirely separate from any health plan's contracted rate — the schedule that applies is the one the state publishes, not whatever the practice bills a commercial payer for the same code. Auto liability and no-fault PIP claims frequently work the same way, with state insurance law, not a payer's network agreement, setting what's payable.

Authorization, where it exists, usually runs through the adjuster's case management or the state's own utilization-review process for the claim type, not a payer's prior-authorization department — a treatment plan gets approved, or disputed, claim by claim, and the approval lives in the adjuster's file, not a portal. the fee schedule and the authorization pathway are set by the state and the adjuster, not by a payer's provider contract.

ERISA doesn't reach workers' comp — what that changes

Workers' compensation is explicitly excluded from ERISA, and auto liability isn't an ERISA health plan either — which means the federal preemption that shields many self-funded employer health plans from state law has no equivalent here. State workers' comp statutes and state insurance law govern the claim directly, including its own dispute and appeal process, which looks nothing like an ERISA health plan's internal appeal and external-review sequence 2Ref 2U.S. Department of Labor (2026).ERISA.That workers' compensation is excluded from ERISA and that ERISA's preemption of state law, which shapes many self-funded employer health plans, has no equivalent for a workers' comp or auto liability claim..

Whether you, as the practice owner, are required to carry workers' comp coverage on yourself is a separate question from any of this — a decision about your own employer obligations, not about how a patient's injury claim gets billed.

Where Medicare fits: the secondary-payer overlap

When a Medicare beneficiary is hurt in a car accident or a work-related incident, Medicare is usually the secondary payer, not the primary one — it can make a conditional payment while the liability claim is pending, then seek reimbursement once the auto or workers' comp carrier pays or settles. Those Medicare Secondary Payer provisions, along with Medicare's 12-month timely-filing rule for what it bills, live in the Medicare Claims Processing Manual inside CMS's Internet-Only Manuals 3Ref 3Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That Medicare Secondary Payer provisions and Medicare's 12-month timely-filing rule live in the Medicare Claims Processing Manual within CMS's Internet-Only Manuals..

Coordinating that recovery starts with knowing which Medicare Administrative Contractor serves the claim's jurisdiction — CMS publishes the current assignment for every jurisdiction 4Ref 4Centers for Medicare & Medicaid Services (2026).Medicare Administrative Contractors.The lookup method for finding which Medicare Administrative Contractor handles Medicare Secondary Payer recovery in a given jurisdiction.. Billing Medicare first when a liability claim is open, rather than reporting it, is one of the more common ways a practice ends up repaying money it already spent.

Billing mechanics: claim numbers, adjusters, and liens, not member IDs

The claim form itself often stays familiar — many workers' comp and auto liability payers still accept a CMS-1500 — but everything around it changes: the payer field holds the adjuster's claim number instead of a member ID, the diagnosis has to tie back to the reported injury or accident, and the bill goes to the adjuster's mailing or portal address, not the health plan's clearinghouse.

Settlement checks are their own risk: a lump-sum liability settlement is exactly the kind of irregular, one-off payment that benefits from the same internal controls used everywhere else in the practice — never one person alone opening, endorsing, and depositing it. And if the carrier disputes the claim and the balance sits unpaid for months, resist sending the patient to collections while liability is still being contested; if it does reach a collection agency, the FDCPA still governs how that agency can contact the patient, regardless of which kind of payer created the balance 5Ref 5Federal Trade Commission (2026).Fair Debt Collection Practices Act.That the FDCPA governs third-party collection conduct on a patient balance regardless of whether the underlying claim was a workers' comp, auto liability, or health-insurance balance..

Keep the differences from becoming a billing habit that costs you

Treating a workers' comp or auto liability claim like a commercial insurance claim — sending it through the same eligibility check, the same authorization request, the same fee schedule assumption — is the single most common way these claims get billed wrong. The fix is procedural: flag the claim type at intake, route it to a separate workflow, and never let the front desk default to "insurance" when the payer is actually an adjuster.

Because each state sets its own workers' comp fee schedule and its own filing deadline, put both on the same expirables calendar that already tracks your license-maintenance renewal dates — the discipline is identical, only the dates are different. And the same carve-out logic applies beyond injury claims: eap work is billed as its own separate arrangement too, outside standard commercial billing, for the same underlying reason — the payer isn't the patient's health plan.

Common questions

No — there's no standard 270/271 eligibility transaction for a workers' comp claim. Verification means confirming the claim number, the date of injury, and acceptance status directly with the assigned adjuster, since the carrier isn't running the same electronic-transaction infrastructure a health plan is required to support.

Often not automatically — many health plans exclude work-related injuries entirely under the workers' comp exclusive-remedy doctrine, whether or not the workers' comp claim was accepted. Check the health plan's own policy language and the claim's specific denial reason before billing it as a commercial claim; the two systems don't default into each other.

Medicare's own timely-filing rule — 12 months from the date of service — applies to what's billed to Medicare itself, including a conditional payment claim. The workers' comp or auto liability carrier's own deadline is set by that state's law or that carrier's policy, and it can be shorter or longer. Track both deadlines separately; meeting one doesn't satisfy the other.

That depends on the state's auto insurance system and the specific policy's coordination-of-benefits language — no-fault states often require billing auto MedPay or PIP first, while others leave the order to the patient's policy. Confirm the order with the auto carrier's adjuster before billing either payer, rather than assuming health insurance is always primary.

Then the claim sits in dispute, and billing decisions should wait on that determination rather than guessing which payer is correct. Document the dispute status from the adjuster in writing, and hold the balance rather than sending it to the patient or to a different payer until the compensability question is resolved.

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References

1.CAQH (2026). CAQH CORE Operating Rules. CAQH CORE. link ✓That CAQH CORE's 270/271 eligibility operating rules govern health plans, which is why the same standard eligibility transaction does not reach workers' comp or auto liability carriers.
2.U.S. Department of Labor (2026). ERISA. U.S. Department of Labor. linkThat workers' compensation is excluded from ERISA and that ERISA's preemption of state law, which shapes many self-funded employer health plans, has no equivalent for a workers' comp or auto liability claim.
3.Centers for Medicare & Medicaid Services (2026). Internet-Only Manuals (IOMs). Centers for Medicare & Medicaid Services (CMS). link ✓That Medicare Secondary Payer provisions and Medicare's 12-month timely-filing rule live in the Medicare Claims Processing Manual within CMS's Internet-Only Manuals.
4.Centers for Medicare & Medicaid Services (2026). Medicare Administrative Contractors. Centers for Medicare & Medicaid Services (CMS). link ✓The lookup method for finding which Medicare Administrative Contractor handles Medicare Secondary Payer recovery in a given jurisdiction.
5.Federal Trade Commission (2026). Fair Debt Collection Practices Act. Federal Trade Commission (FTC). link ✓That the FDCPA governs third-party collection conduct on a patient balance regardless of whether the underlying claim was a workers' comp, auto liability, or health-insurance balance.

https://www.gale.care/for-providers/va-workers-comp-auto-liability · 5 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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