The Biden administration is making it easier for doctors and nurses to treat homeless people wherever they find them, from creekside encampments to freeway underpasses, marking a fundamental shift in how — and where — health care is delivered. As of Oct. 1, the Centers for Medicare & Medicaid Services began allowing public and private insurers to pay “street medicine” providers for medical services they deliver anyplace homeless people might be staying. The change comes in response to the swelling number of homeless people across the country, and the skyrocketing number of people who need intensive addiction and mental health treatment — in addition to medical care for wounds, pregnancy, and chronic diseases like diabetes.