HEALTH CARE FIRMS TO MERGE.(BUSINESS)

Byline: -- Associated Press

RICHMOND, Va. -- The managed health care provider Trigon Healthcare Inc. said Monday it has agreed to be acquired by Indianapolis-based Anthem Inc. for about $4 billion in cash and stock.

Both companies are former nonprofit Blue Cross Blue Shield providers that operate now as for-profit corporations and have a combined total of 10 million members.

The merged company would rank as the nation's …