Lynda ArtesaniLegal Accountant and Data Migration Specialist at The Proper Trust

One Tiny Billing Code Mistake That Can Get Your Invoice Rejected #legalaccounting #lawfirms

27 Apr 2026 · 1 min

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A single digit error in ABA activity codes can get your invoice rejected. Using research code A102 instead of draft and revise code A103 triggers claims of unauthorized work and budget mismatches. Careful billing workflows prevent costly mistakes.

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I'll tell you, within the billing, there are certain code sets that you have to use. And I've seen bills rejected just over a little error in a code set. And most of them are based on the ABA activity codes. You can go there and find them. But let's use as an example, research is code number A102. Mm-hmm. And so if you accidentally put in A103, that means draft and revise. So they may reject the bill because you were not authorized, it wasn't in the budget, but the A102 was. And it gets very scientific in that type of billing, and you just have to be super patient and super organized, to your point, with your workflow on it.