Maximum Out-of-Pocket (MOOP) is the maximum amount an individual must pay for covered healthcare services during a plan year under their insurance policy.
In research settings, MOOP can affect participant financial burden when routine care costs or standard-of-care procedures occur alongside study participation. Understanding MOOP considerations supports clearer participant communication about potential costs and helps inform coverage analysis and budgeting discussions. While MOOP is not a regulatory trial requirement, financial exposure can influence recruitment, retention, and equity in access to research. Thoughtful planning reduces surprises for participants and supports ethical study conduct.