When computing monthly AMP, should manufacturers be calculating all the calculation components at the NDC-9 or just the smoothing components?

In accordance with regulations at 42 CFR 447.510(d)(2), monthly AMP is calculated based on a weighted average of prices for all the manufacturer's package sizes (NDC 11) of each covered outpatient drug sold by the manufacturer during a month. It is calculated as the net sales divided by the number of units sold, excluding goods or any other items specifically excluded in statute or regulation. In accordance with the requirements of 42 CFR 447.510(d)(2)(iii) the smoothing of lagged price concessions occurs at the NDC-9 level as part of the monthly AMP calculation.

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