Core prices, which excludes the volatile categories of food and energy, rose 0.1 percent in the month, unchanged from August.
Energy prices rose 0.8 percent, while the food price index was unchanged, the report said.
Over 12 months, core prices are up 1.7 percent, with shelter and medical care expenses both up 2.4 percent, food up 1.4 percent and energy up 3.1 percent.
On an unadjusted annual basis, gasoline prices are down 7.5 percent and fuel oil down 3.1 percent.
The Labor Department said prices for new vehicles rose 0.2 percent from August and were up 1.2 percent over 12 months.