External review is the process by which OPM, or an Independent Review Organization if the case requires medical judgment, reviews a health insurance plan’s decision to deny a benefit or payment for a service for an enrollee in an MSP option. Except in certain circumstances, you must first file an internal appeal with the health plan to reconsider its decision. If the plan continues to deny the benefit or payment, you have the right to request an external review. Please visit the Multi-State Plan Program External Review website for more information.