We still don’t know quite why the assassin of Brian Thompson targeted the CEO of UnitedHealthcare. But it’s hardly a secret that UnitedHealthcare has the worst record among all large insurers in denying necessary medical care to its subscribers. The data confirm what far too many patients experience. In 2023, UnitedHealth’s denial rate of claims was 32 percent, compared to an industry average of 16 percent. Nonprofits had a far better record than for-profits.