If a sampling unit in the probe sample has been underpaid, how should this be assessed in terms of dollar difference when determining the full sample size?
Answer 19: For purposes of calculating the full sample size, sampling units that have been underpaid in the probe sample should be entered as a zero. This is because the objective of the billing review is to determine the amount of overpayments in the population. Given this objective, neither a dollar difference of zero nor an underpayment are considered to be overpayments, thus a zero should be entered into the calculation for that particular sampling unit.
