The biggest drug distributor in the United States, McKesson Corp., has agreed to pay a combined $151 million to 29 states to settle claims that it inflated drug prices reported to state Medicaid programs. Prices provided to First Data Bank, whose index is used to determine drug pricing for those programs, were inflated by as much as 25%. California, which will receive a $23.5 million share of the settlement, reported the price-gouging went on from August 2001 to December 2009.