Customer Service: 866-788-9007

What does Castle Biosciences do?

Castle Biosciences is a molecular diagnostics company that provides actionable, tumor-specific information for improved treatment decisions and patient outcomes in dermatologic cancers. We conduct sophisticated studies to develop and validate the accuracy of our tests, which assess specific tumor biology to predict likelihood of disease recurrence or likely response to therapy. Our tests provide patients and their doctors with critical information for better management of their disease.

What diagnostic tests does the Company offer?

Castle Biosciences offers tests designed to identify metastatic risk in cutaneous melanoma and uveal melanoma. We also have active research programs in other dermatologic cancers.

Are there additional tests in development?

We are conducting studies in several skin cancers with high medical need. For example, Castle Biosciences is developing a gene expression profile test to improve upon current staging systems and identify patients with cutaneous squamous cell carcinoma at high risk for metastasis and death. We are committed to continuing research in dermatologic cancer to improve patient care.

How are your diagnostic tests reimbursed?

Castle Biosciences works with Medicare, commercial insurance providers and, in some cases, the physician’s institution to secure payment coverage for its diagnostic and prognostic tests. Castle submits insurance claims on the patient’s behalf and follows through to payment. The Company believes a patient’s ability to pay for the test should not affect their care, and has put a generous Patient Assistance Program in place for those who need it.

Is the Castle Biosciences laboratory certified and accredited?

Castle Biosciences’ laboratory has Clinical Improvement Act (CLIA) certification and College of American Pathologists (CAP) accreditation, which is widely recognized as the gold standard around the world.

What is the process for testing, and how long before I would receive a result?

Your healthcare provider can fill out and fax a requisition form to Castle Biosciences from our Order a Test page. For some of our tests, your healthcare provider’s office will receive a specimen kit for preparing and sending the tumor tissue sample to the lab for analysis. The lab will send a report with the test results within 2-3 weeks of receiving the tumor sample from your doctor.

What if my doctor doesn’t know about molecular testing?

Molecular diagnostic testing is an emerging, fast-growing field so it would not be unusual for your doctor to be unaware of all the tests that are now available for treatment planning. If your doctor is interested in more information beyond our test descriptions on this website, please refer them to customer service (see phone number, contact form top right).

Can I order a test as a patient?

Only a Physician, Physician’s Assistant, or Nurse Practitioner can order a Castle test.

Who can I contact if I have a question?

Please call our customer service staff at 866-788-9007 or email

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