Code of Federal Regulations Title 41. Public Contracts and Property Management § 41.101–30.403–2 Management codes

For internal use within an agency, alphabetic codes excluding letters “I” and “O” may be prefixed or suffixed to the national stock number as CM7520–00–123–4567 or 7520–00–123–4567CM, as required for supply management operations. Numeric codes shall not be affixed immediately adjacent to or as a part of the national stock number, nor shall codes be intermingled in the national stock number.