Tracking authorized ABA units
Tracking authorized units means comparing two lines every week: an even pace from the authorization's start to its end date, and the units actually delivered. The gap between them predicts the two failure modes — running out early or leaving approved units unused — while there is still time to act.
Next: run your numbers in the authorization calculator
Updated 2026-09-23 · 5 min read
Written by Operation Optimize editorial team · Last updated 2026-09-23
Rules version 2026.08
Units are not hours
Most ABA billing codes are defined in 15-minute units: 4 units equal one hour of service. An authorization of 960 units over six months is 240 hours — about 40 hours a month at an even pace. Tracking in hours while the authorization is written in units, or the reverse, is the first math error to eliminate. The ABA authorizations explainer puts those units into the full request-to-renewal lifecycle.
The two failure modes
| Failure mode | How it shows up | What to do |
|---|---|---|
| Running out early | Delivered pace above even pace; projected use exceeds authorized units before the end date | Request a modification, adjust scheduling, or accelerate reauthorization |
| Units left unused | Delivered pace below even pace; projection ends under the approved total | Investigate cancellations and staffing; unused hours are care not delivered |
Under-utilization gets less attention than over-utilization, but chronically unused authorizations are a clinical finding: the member was assessed as needing those hours and did not receive them. Repeated large variances also invite closer review at the next ABA reauthorization.
A weekly five-minute review
- Enter the authorized units and the period dates.
- Enter units delivered to date, per billing code where they differ.
- Compare against even pace: elapsed fraction of the period versus fraction of units used.
- Read the projection: total use at the current pace against the authorized total.
- Act on any variance above roughly 10% — early is when options still exist.
Authorization pacing calculator
Enter the authorization exactly as the approval letter states it. Everything stays in your browser.
Period elapsed
49%
Authorized used
33%
Projected use by end date
647 units
Remaining
640 units
Days left in period
92
Run-out risk
None at current pace
Start reauthorization by
2026-11-24
Behind pace — approved care is going undelivered. Investigate cancellations and staffing before the units expire.
The projection assumes today's delivery pace continues. Reauthorization lead times vary by payer — confirm yours in the plan's provider manual. Educational tool, not billing advice.
Reading a mid-period position
- Authorization: 960 units over 182 days; day 91 of the period (50% elapsed)
- Units delivered: 420 of 960 (44% used)
- Position: behind even pace by 6 percentage points
- Projection at current pace: about 840 units by the end date — roughly 120 units of approved care undelivered
Frequently asked questions
- How do I track authorized ABA units?
- Record the authorized units and period dates from the approval letter, total delivered units weekly, and compare against an even pace across the period. The free calculator on this page does the projection in one pass.
- How many ABA units are in an hour?
- Most ABA billing codes are 15-minute units, so one hour equals 4 units. Check each code's definition in the payer's fee schedule or your contract.
- What happens if we don't use all the authorized units?
- Unused units simply expire — but they represent approved care that was not delivered, and a pattern of under-use can affect future authorizations. Investigate the scheduling or staffing cause.
- Can unused units roll into the next authorization period?
- No. Units are approved for a defined period and expire with it. Each new period starts from the new approval's own units and dates.
How this works in Operation Optimize
Operation Optimize applies the same pace-vs-total discipline to supervision and credentials today.
- Supervision requirements are tracked monthly against pace, not reconciled after the fact
- Credential renewals warn with real lead time
- Insufficient data is reported as undetermined — never as a false failure
Sources
Related tools
Free calculators that put this requirement into numbers. No account needed.
- ABA authorization calculator — Track authorized units against pace: projected use, run-out risk, and when to start reauthorization.
Related guides
ABA authorizations explained
The full authorization lifecycle, Medicaid vs. commercial differences, and the tracking that prevents lapses.
ABA reauthorization timelines
Lead times, the progress documentation payers expect, and a scheduling method that prevents gaps.
How ABA prior authorization works
The request, the documents, the review, and the decision — step by step.