Edison Ventures is investing $4 million in Premier Healthcare Exchange (PHX) Inc., a health care cost management firm.

PHX, Bedminster, N.J., helps health plans set up provider networks and hold provider costs down.

Edison, Lawrenceville, N.J., is a well-known venture capital firm.

PHX will be using the cash from Edison to expand sales and marketing offers and help shareholders who want to exchange shares for cash, the company says.