Gene expression profile testing of cancer tissue

Gene expression profile (GEP) testing analyzes the expression patterns of a number of different genes within cancer cells to predict the cancer’s aggressiveness and risk of recurrence. GEP testing has been used to help inform decisions on treatments of different cancers. These tests can lead to potential benefits, such as more appropriate treatment decisions and better patient outcomes, including avoidance of treatment-related side effects by forgoing unnecessary treatments.

Coverage decision: Gene expression profile testing of cancer tissue (Effective date: October 1, 2018).

Is authorization required?

How do I get pre-authorization?


L&I (State fund): Complete the Preauthorization Form and fax to: 360-902-4567

For self-insured: Contact the employer or its third party administrator.

Regulatory authority and related information


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