UnitedHealth's Warning Sends Health Insurers Reeling.
Shares of health insurers declined in premarket trading after UnitedHealth warned that a spike in demand for long-delayed medical procedures in the second quarter was expected to drive up its medical costs. The warning, however, lifted shares of medical device makers and hospital operators that have been hit by hospital staffing shortages and people delaying non-urgent surgeries due to the COVID-19 pandemic.