A contract between Stanford Hospital & Clinics and giant health plan Anthem Blue Cross expired on midnight Sunday, affecting about 10,000 enrollees. Mark Morgan, Anthem's president, sent a Sept. 5 letter to Amir Dan Rubin, president and CEO at what's now known as Stanford Health Care, calling it "unfortunate that (Stanford) has decided to terminate" the contract. Anthem says Stanford Health Care sent a letter in late February that terminated the contract in 180 days. But officials at Stanford say the three-year contract was scheduled to terminate at 11:59 p.m. Sunday.