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How do I pay my Quest Diagnostics bill online? In order to pay online, you must create an account on the Quest Diagnostics online website. Please visit Quest Diagnostics's website for more details on how to register. What forms of payment does Quest Diagnostics accept? Quest Diagnostics accepts the following forms of payment: Checking; Visa; MasterCard; American Express
At a Glance. 1  Quest Diagnostics is the worldâs leading provider of diagnostic information services. 2  Generated 2016 revenues of approximately $7.5 billion. 3  Publicly trades common stock on the New York Stock Exchange (NYSE: DGX). More in Investor Relations. 4  Ranks as a component of the S&P 500.