Kaiser Permanente pairs a nonprofit health plan with its own hospitals and medical groups, so your coverage and your care come from one integrated system. Founded in 1945 by industrialist Henry J. Kaiser and Dr. Sidney Garfield, it now serves roughly 12.5 million members across California, Colorado, Georgia, Hawaii, Oregon, Washington, and the Mid-Atlantic states. Employers buy Kaiser for group medical, dental, and vision, and individuals can enroll directly or through a Kaiser Medicare Advantage plan. You check claims, pay premium and medical bills, refill prescriptions, and message your care team through your kp.org account. Because Kaiser is a nonprofit health plan rather than a commercial insurer, AM Best does not publish a financial strength rating for it.