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CFN/FEI is for Manufacturing site to register in FDA ,so FDA can inspect your firm.
Central File Number (CFN): 7-digit number assigned by FDA.
FDA Establishment Identifier number (FEI): 7 to 10-digit number assigned by FDA
从“FACTS automatically generates a 10-digit FEI number under the firm build screen when a new firm is added. Firms previously in FIS retained their original 7-digit CFN whICH, in most cases, also became their FEI number. The old CFN can be viewed under the cross-reference viewing screen in FACTS. See Appendix IV, General Rules and Guidance for Assignment of Firm Establishment Identifiers, for assignment rules of FEI numbers.”这一段可以看出，CFN是FEI的前身，不知各位看法如何？