You were billed by Quest Diagnostics for laboratory services that were prescribed by your doctor. This invoice, which is distinct from any bills you may have gotten from your doctor and/or paid at their office, is for the costs associated with laboratory tests only. Your doctor may have submitted your sample to a Quest Diagnostics facility for testing even though you may not have personally visited one. For more detailed information about why you got a charge, please refer to the statement on your Quest Diagnostics invoice or the Explanation of Benefits (EOB) from your insurance provider. You might have gotten a bill for a number of reasons, including but not restricted to the following- On your test order, insurance information was either not received at all or received incorrectly. After processing the claim, the insurance company declined to pay. The insurance company processed the claim and assigned the remaining funds to your deductible or co-pay. The insurer's response to the claim was nonexistent.