X9 X9.100-160-2-2014 establishes external processing code (EPC) assignments and management, and specifies which MICR characters are approved by ASC X9 for use in the U.S. Payments System.
Print and Test Specifications for Magnetic Ink Printing (MICR) Part 1: Print Specifications, Part 2: Conformance Testing, Part 3: Secondary Reference Documents (Formerly X9.27)