WASHINGTON -- California lawmakers are questioning whether an auditing company in which San Francisco investor Richard Blum, the husband of Sen. Dianne Feinstein, has a major financial stake is rejecting Medicare claims at California rehabilitation hospitals to reap millions of dollars in profits at the expense of patient care. The company, PRG-Schultz International, has a contract with the Centers for Medicare and Medicaid Services, the overseer of the Medicare program, to check payments in California for mistakes. Its only pay is a bounty of up to 30 percent on the overcharges it identifies. The California Hospital Association first raised concerns...