Medicaid Exclusion File (MEF)
Definition
The Medicaid Exclusion File (MEF) is a critical program integrity tool that prevents duplicate discounts in the Medicaid fee-for-service (FFS) context. HRSA generates the MEF quarterly from OPAIS data, specifically from each covered entity site’s Medicaid billing designation.
The MEF is used by multiple stakeholders: covered entities use it to confirm their Medicaid billing designations are accurately reflected; state Medicaid agencies use it to exclude 340B claims from their rebate requests to manufacturers; and manufacturers use it to verify which claims should not be subject to Medicaid rebates.
The MEF is generated from a snapshot of OPAIS data taken at 12:01 AM ET on the 16th day of the month prior to the start of each quarter. Changes to OPAIS Medicaid billing designations must be made before this snapshot date to be reflected in the next quarter’s MEF.
The MEF applies only to Medicaid FFS. It does not address duplicate discount risk in Medicaid managed care arrangements, which require separate coordination between covered entities, states, and MCOs.
Frequently Asked Questions
Why Medicaid Exclusion File (MEF) Matters
The MEF is the primary mechanism for preventing duplicate discounts in Medicaid FFS. Covered entities must ensure their OPAIS Medicaid billing designations are accurate and updated before each quarterly MEF snapshot to maintain accurate MEF representation.
How Virtue 340B Uses It
Virtue 340B reviews MEF accuracy as part of every audit engagement, verifying that covered entity OPAIS designations are current and that MEF data accurately reflects actual Medicaid billing practices.