CNBC is now accepting nominations for the 2026 Changemakers list. Learn more and submit a nomination by Nov 21. For the first time in decades, people are having real conversations about health care, "from the ground up," says Dr. Toyin Ajayi. That has her feeling optimistic. "We're in a moment where health and health care — and what it means to be healthy — is the subject of a national discussion," the co-founder and chief executive officer of Cityblock Health told CNBC Senior Media & Tech