Other True Out-of-Pocket (TrOOP) Amount
This is the amount of any payment made by other third-party payers that reduces the beneficiary's liability for the PDE and counts towards Part D's true out-of-pocket (TrOOP) requirement. Two examples are payments by qualified state pharmacy assistance programs or charities. This variable does not include amounts covered by the Part D low-income subsidy.
Some additional information on this variable: