Buzzy primary care startup Iora Health just raised $126 million. Meet the 8 companies changing how doctors get paid and building the future of medicine.

· Investors are pouring millions into companies looking to shake up the way patients go to the doctor's office. 
· Over the past few years, models like venture-backed Iora Health, family-owned ChenMed, and private-equity-backed Oak Street Health have picked up steam in their approaches to caring for elderly Americans, boosted...