At issue is the way that Medicare reimburses everyone from the big laboratory companies such as the Laboratory Corp of America (LH:NYSE) and Quest Diagnostics Inc. (DGX:NYSE), to the molecular diagnostic labs inside academic hospitals, and especially smaller firms that make proprietary tests used by doctors to more effectively target treatments to patients with conditions like cancer.

FORBES: Medicare Has Stopped Paying Bills For Medical Diagnostic Tests. Patients Will Feel The Effects

Quest Diagnostics, Inc. ( NYSE: DGX), according to The Online Investor.

FORBES: Connect

Among the largest underlying components of RYH, in trading today Quest Diagnostics, Inc. ( NYSE: DGX) is up about 0.4%, Medco Health Solutions, Inc. ( NYSE: MHS) is up about 0.1%, and Varian Medical Systems, Inc. ( NYSE: VAR) is higher by about 2.2%.

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