Why would insurance not cover a lab bill?

Common reasons include deductible, out-of-network processing, claim denial, diagnosis or coding issues, and timing mismatches between the provider bill and the insurer record.

Should I pay a lab bill before checking the EOB?

It is usually better to compare the lab bill with the EOB first. The EOB can show whether the insurer processed the claim, denied it, or assigned the remaining amount to your responsibility.

Lab Bill Not Covered by Insurance? What to Check Before You Pay

A lab bill may not be covered because of deductible, network status, claim denial, diagnosis or coding issues, or because the provider bill does not line up with the EOB. The safest first step is to compare the lab bill with your EOB before you pay.