The HICP series, including back data, is revisable under the terms set in Articles 17-20 of Commission Implementing Regulation (EU) 2020/1148.

The publication of the Consumer Price Index (CPI) is carried out twice for a given month. A provisional estimate is published at the end of the month and the definitive index is published on or around the 15th of the following month. The definitive CPI, used for indexing many public and private contracts, cannot be revised.

The HICP can be revised within the limits defined Articles 17-20 Commission Implementing Regulation (EU) 2020/1148.

In 2016, a modification of the harmonised index of consumer prices from January to May was carried out in order to correct an error concerning fresh products.