When to use an FDA FEI or CFN number?

An FDA Facility Establishment Identifier (FEI) number is used to identify registered facilities that manufacture, process, pack, or hold FDA-regulated products. It is essential for compliance and regulatory purposes, particularly during inspections or when submitting product applications. A CFN (Case File Number) is typically used for specific investigations or enforcement actions by the FDA. Use the FEI number for routine regulatory matters and the CFN for particular case-related inquiries.