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November 7, 2026

8 Common ABA Billing Denials and How Software Prevents Them

Most ABA denials are preventable at the schedule, note or claim-build step. Eight causes and the software control that stops each.

TWO44 Team6 min read6 viewsNovember 7, 2026
Common ABA denials include expired or missing authorizations, billing past approved units, unsigned session notes, wrong codes or modifiers, ineligible coverage, late submissions, duplicate claims and unmatched remittances. Software prevents them with authorization-linked scheduling, note gating, a claim scrubber and a denial work queue.

Denials are cheapest to fix before the claim exists. Here are eight causes we design against in the claims module.

In short: Common ABA denials include expired or missing authorizations, billing past approved units, unsigned session notes, wrong codes or modifiers, ineligible coverage, late submissions, duplicate claims and unmatched remittances. Software prevents them with authorization-linked scheduling, note gating, a claim scrubber and a denial work queue.

1. Expired authorization

Prevent by alerting before expiry and showing lapse on the board.

2. No authorization line for the service

Warn at scheduling and block completing the event until a line exists, with an admin override that needs a reason.

3. Billing beyond approved units

Block completing events beyond the line total.

4. Unsigned session note

Keep the session in “note required” until the note is signed, then mark it billable.

5. Wrong code, modifier or diagnosis

Use payer rules and a claim scrubber to flag mismatches before submission.

6. Eligibility problems

Record eligibility checks against the client insurance and surface changes.

7. Late submission

Capture charges nightly and keep a held-charges list so nothing waits silently.

8. Unmatched remittances

Post 835 payments to claims automatically and flag unmatched ones for review.

Frequently asked questions

Does software guarantee payment?

No. It reduces avoidable errors. Payers decide payment.


Related: software for medical billing companies.

This article is part of our ABA Therapy topic cluster — browse more guides in this category.

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No. It reduces avoidable errors. Payers decide payment.