Workers’ compensation is not health insurance. It is a separate system, paid for by the employer’s insurer, that covers the treatment of an injury or illness that came from the job. Your plan, your card and your deductible have nothing to do with it: once the claim exists, bills go directly from the employer’s workers’ compensation insurer to the provider who treated you. The benefits available include medical care, cash benefits and death benefits; this entry is about the medical side.

The financial difference is not small, and it runs the wrong way from what people assume. Medical care to treat a work-related injury is provided at no cost to the worker. No deductible, no copay, no coinsurance, no “your share”. That is a better outcome than any health plan produces for the same injury, which makes the routing question — which system gets billed — the entire game.

Routing happens at the registration desk, before the paperwork, in one sentence: “This happened at work. This should be a workers’ compensation claim.” Said, the bill goes to the employer’s insurer. Unsaid, it goes to your health plan with your cost sharing attached, or to you as a self-pay patient. Correcting it later is possible and it is work.

In New York: four rules decide whether the claim survives, and the first two are deadlines.

Notify the employer within 30 days, in writing if at all possible — a letter, an email, a text that leaves a date. Let 30 days pass with no notice and you can lose the right to benefits.

File Form C-3, the Employee Claim, with the Workers’ Compensation Board within two years of the accident, or of when you knew, or should have known, that a condition came from the nature of the work. That second version is what covers injuries that build up rather than happen in a moment. Notifying the employer and filing with the Board are two separate steps. Telling a supervisor is not filing a claim.

The claim form does not require a Social Security number, and every worker injured on the job in New York may file regardless of immigration status. What status does and does not affect.

Except in an emergency, the treating provider must be authorized by the Board. Your own doctor may not be. In an emergency, go to the nearest emergency room and worry about none of this; the authorization rule does not apply there. For everything after, ask before booking: “Are you authorized by the Workers’ Compensation Board to treat injured workers?”

If a bill reaches you while the claim is still being sorted out — common, usually because the provider billed the health plan or the patient before the claim was accepted — do not pay it on the assumption that it is yours. Give the billing office the claim information. Where a hospital is involved, the state’s financial assistance law sits underneath as a second floor, and applications are accepted at any stage.

Also called: workers’ comp, work injury benefits. Full guide: Injured at work: the sentence to say in the emergency room.

More in Glossary of health coverage and billing terms

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This page explains how the system works. It is not medical advice. More.