UnitedHealth Group (NYSE:UNH) stock is already under pressure after the U.S. Centers for Medicare & Medicaid Services on Monday signalled essentially unchanged rates for Medicare insurers next year.On Tuesday, the insurance mammoth reported fourth-quarter 2025 earnings and fiscal 2026 guidance.The company reported adjusted earnings of $2.11, down from$6.81 a year ago, beating the consensus of $2.10. Revenues increased 12$113.215 billion, missing the consensus of $113.817 billion.The rep ...