XE, XS, XP and XU, distinct service modifiers. Effective Jan. 1, 2015, four new modifiers more effectively identify distinct services that are typically considered inclusive to another service. Utilizing these modifiers will help with more accurate coding that better describes the procedural encounter.
The first nine numbers in the lower, left-hand part of your check after the MICR character is your routing number. 1  Be sure to exclude any preceding MICR characters when determining your routing number. 2  Following your routing number, the next set of numbers, up until the next MICR character, is your account number.
Source(s): http://en.wikipedia.org/wiki/Routing_tra... At the bottom of your check, there are 3 numbers. The first number on the left is the serial number, then it is the routing number which identifies your bank, and then it is your account number (8 digits). I have two bank accounts. In both cases the routing number is 9 digits, and the account number is not.