Sure, except they own the pharmacy (https://en.wikipedia.org/wiki/Optum), the payments solution (https://en.wikipedia.org/wiki/Change_Healthcare), the outpatient surgery centers (https://en.wikipedia.org/wiki/SCA_Health), the in-home care providers (https://en.wikipedia.org/wiki/Amedisys), and a whopping 10% of the country's doctors - the nation's single largest employer of them (https://www.statnews.com/2024/07/25/united-health-group-medi...).
(Oh, and they pay their doctors higher rates. https://www.statnews.com/2024/11/25/unitedhealth-higher-paym...)
Those are "expenses" for that margin calculation.