The lack of state-to-state border controls has often served as an excuse to increase federal regulation of all states in the name of "uniform" laws. We've seen this with guns, drugs, alcohol, and migrants.
Was healthcare a natural right two hundred years ago? If so, how is it that this "right" to eighteenth-century medicine morphed into a right to MRIs and chemotherapy? Do rights change with technology? That's not how rights work.