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Please read an important announcement alert regarding your billing policy

Insured Patients


InSource Diagnostics will bill the insurance provider 100% of the charges. If the health plan instructs us to bill the patient for co-payments, co-insurance, and deductibles then we are required by law to bill accordingly. These amounts are determined by your insurer and not by InSource Diagnostics.

ALERT - Please Click Here For An Important Billing Policy Announcement.

Billing Process

Your insurance company will be billed for the services provided. Upon processing of the insurance claim, you will receive an Explanation of Benefits (EOB) from your insurance company. THIS IS NOT A BILL. The EOB simply explains what services were billed to your insurance company and summarizes the payment status of the claim. If you have any questions regarding this EOB, or any correspondence from your insurer, please contact us directly (626) 386-5277. Do not contact your doctor's office regarding your drug screen EOB as they will not have the details regarding your claim.


InSource Diagnostics is committed to completing up to three levels of appeals where allowable by your insurance company and individual plan. We may ask you and your physician to assist in the process as needed. Depending on the insurance company, this can be a very lengthy process. We will keep you informed, as needed, during this process.


In some instances, your insurer will send payment directly to you, instead of us. If you receive a payment from your insurance company, it is your responsibility to pay within 10 days of receipt of payment. Please endorse the back of the check and write "Payable to InSource Diagnostics, For Deposit Only" and mail to the following address:

InSource Diagnostics
Attn: Billing Department
213 W Chestnut Ave
Monrovia, CA 91016

Failure to send checks to InSource Diagnostics may result in you being sent to an outside collection agency. To prevent future payments directly to you, please contact your insurance carrier and choose to assign benefits to the rendering provider.

Changing the World. One Test at a Time.

Contact Us

231 W. Chestnut Ave. Monrovia, CA 91016
Office: (626) 386-5277 | Fax: (888) 677-7748 |

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