Using the panel data of Russian regions for the period from 2010 to 2021 we partially confirm the usefulness of a disaggregated approach. Individual modelling of the short-term price dynamics of individual commodity groups is ahead in terms of accuracy of the overall inflation model, including standard benchmark models, but only under certain conditions. First, it is necessary to include the factors of trend inflation in the models, which helps to separate the trend inflation acceleration/deceleration from short-term idiosyncratic fluctuations. Secondly, the models should have the property of inflation convergence to its long-term level, determined by the Bank of Russia's goal. Under these conditions, the disaggregated approach gives a more accurate forecast on short horizons than the aggregated one and a forecast of comparable to non-structural models’ accuracy on longer ones.