Where does one find the "implicit price deflator of the GDP as calculated by the Dept. of Commerce and published by the Survey of Current Business," which is needed to calculate COBRA premiums for self-funded plans under the past costs method??

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Why are you doing this ?? Let your stop-loss carrier and your Plan administrator do the calculations and then provide you with their methodology and whatever else you want. Your calculation is irrelevant if the stop loss carrier method etc is not consistent or is inaccurate.