The one thing your employer is hoping you never find out is this: in Illinois, being told to use your own health insurance does not erase your workers' comp rights.

Picture a Chicago road-crew laborer who tweaks his back in a lane shift on I-290 during construction season. His foreman says, "Don't make this a comp claim. Go to Stroger or use your own insurance." He does that, keeps working hurt, and weeks later realizes he may need more treatment and time off. He is often not out of time just because the boss said the wrong thing.

Here are the rules that matter in Illinois:

• You generally must notify your employer within 45 days of the work injury.
• A formal workers' comp case usually must be filed with the Illinois Workers' Compensation Commission within 3 years of the injury or 2 years from the last payment of compensation, whichever is later.
• You can usually choose 2 doctors of your own, plus referrals from those doctors, instead of only seeing the company clinic.
• If your doctor puts you on restrictions and the employer has no suitable light duty, you may be owed temporary total disability (TTD) benefits.
• Illinois employers are not allowed to retaliate because you pursued a workers' comp claim.

If you already used private insurance, that does not automatically ruin the claim. The key is whether the injury happened in the course of your job. Report it now, in writing, with the date, place, and how it happened.

If a non-employer caused the injury too - like a driver crashing through a work zone or defective equipment on site - you may also have a third-party claim separate from workers' comp.

If your boss keeps saying "don't file," that pressure does not change the deadlines. The 45-day notice clock is the one people in Chicago miss first.