House prices got a push from the homebuyer tax credit and rose 0.8% in April -- the first month-to-month price increase in seven months, according to the Standard & Poor's/Case-Shiller house price index.

The non-adjusted 20-city HPI released Tuesday shows that prices are up 3.8% from April 2009. However, S&P index committee chairman David M. Blitzer said the increase in prices is mainly concentrated in California and gains in other markets are modest.

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