Speaking of Andrew Witty, the UnitedHealth chief spurred a freakout last week on Wall Street after he said the company was beginning to see a “disturbance” in its Medicaid medical costs. More people on Medicaid are going to the doctor and hospital, which eats into the insurance company’s profits. 

The biggest insurers that run state Medicaid programs — UnitedHealth, Elevance Health, Centene, and Molina Healthcare — all saw their stocks take a dive after Witty’s disclosure. For the past year, the surge in medical services has mostly been confined to older adults in Medicare Advantage plans.

Wall Street largely did not account for that trend creeping into Medicaid, which covers low-income people.

This switch is largely a function of the government’s Medicaid “redeterminations” process, Centene CEO Sarah London said at a banking conference Friday. During the pandemic, states didn’t have to kick people off Medicaid if they no longer were eligible. But over the past year, states had to redetermine if someone still qualified for coverage, and to boot those that no longer did. As fewer people remain enrolled in Medicaid, the ones who have stayed are sicker and are getting more care. 

Looking ahead, London told investors not to worry. That’s because Centene and other insurers will get more money from state Medicaid programs (translation: taxpayers) over the next several months, through routine payment updates, to match how sick its enrollees are. The explanation worked: The stocks of all the Medicaid insurers rose on Friday.

“We know how to do this,” London said. “This dynamic of redeterminations is unprecedented right now because of the scale. But matching rates to acuity in Medicaid is normal course.”