Fortuna Health raised $18 million in Series A funding, led by returning investor Andreessen Horowitz, with participation from Y Combinator and executives from Abridge, DoorDash, Hex, One Medical, Oscar Health, Scale, and Vanta. The company will use the funds to invest in AI and automation features that address new federal policies like work requirements and to enhance its Medicaid navigation platform, which has already proven effective at reducing churn by 15 percent.