Question: Which index is the "Official Consumer Price Index (CPI)" reported in the media?

Answer:

The broadest and most comprehensive CPI is called the All Items Consumer Price Index for All Urban Consumers (CPI-U) for the U.S. City Average, 1982-84=100. CPI data are reported on a not seasonally adjusted basis as well as a seasonally adjusted basis. Sometimes the index level itself will be reported, but it is also common to see 1-month, or 12-month percent changes reported.

In addition to the all items index, BLS publishes thousands of other consumer price indexes, such as all items less food and energy. Some users of CPI data use this index because food and energy prices are relatively volatile, and they want to focus on what they perceive to be the "core" or "underlying" rate of inflation.