I'm not sure if I understand the question completely but maybe this will help. An add-on code can only be billed with the primary procedure code. In this case, 26123 is the primary code and it includes doing a fasiectomy on one digit. If the surgeon does this on more than one digit you would also bill the add-on code of 26125 for each additional digit (that is what list separately means - you bill for each add'l digit separately).
for example, a fasiectomy of 3 digits would be billed as: 26123, 26125, 26125
(You may need to add a modifier -59 to the 2nd 26125 to indicate this is not a duplicate charge. I don't think you should have to add the -59 but I think we've experienced denials when we don't use the modifier).
Hope that helps.
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