Psychological testing is one of the best-paying services a mental health practice can offer, and one of the most frequently denied. A full evaluation is billed as several codes across several units, sometimes over several dates, and most payers want it authorized before the first test is given. Get the structure wrong and the whole evaluation can deny at once.
This article covers the testing codes, how units are counted, who can bill each code, and the authorization and denial patterns we see most often. For the session codes used in ongoing therapy, see our complete guide to mental health billing.
Testing is billed in two parts: administration and evaluation
Since 2019, CPT splits testing into two kinds of work, and most evaluations use both:
- Test administration and scoring: the time spent giving the tests and scoring them.
- Evaluation services: the clinician's work interpreting the results, integrating them with history and other data, clinical decision making, writing the report, and the feedback session with the patient or family.
Evaluation codes
| Code | What it covers | Unit |
|---|---|---|
| 96130 | Psychological evaluation services by a physician or qualified health care professional | First hour |
| 96131 | Psychological evaluation services, add-on | Each additional hour |
| 96132 | Neuropsychological evaluation services | First hour |
| 96133 | Neuropsychological evaluation services, add-on | Each additional hour |
Administration and scoring codes
| Code | Who performs it | Unit |
|---|---|---|
| 96136 | Physician or qualified health care professional (two or more tests) | First 30 minutes |
| 96137 | Physician or qualified health care professional, add-on | Each additional 30 minutes |
| 96138 | Technician (two or more tests) | First 30 minutes |
| 96139 | Technician, add-on | Each additional 30 minutes |
| 96146 | Single automated test with automated result | Per test |
The add-on codes (96131, 96133, 96137, 96139) are never billed alone. Each one goes on the same claim as its primary code.
How units are counted
CPT time rules say a unit counts once you pass its midpoint. In practice:
- An hourly evaluation code (96130, 96132) needs at least 31 minutes. Each additional hour (96131, 96133) needs at least 31 more.
- A 30-minute administration code (96136, 96138) needs at least 16 minutes. Each additional 30 minutes needs at least 16 more.
A typical ADHD or diagnostic evaluation might be billed as 96130 + 96131 for three hours of evaluation work, and 96136 + 96137 × 3 for two hours of administration. Document start and stop times, or total minutes per activity, for every part. Payers audit testing claims against those minutes.
Evaluation work often spans several days: testing one day, scoring and report writing later, feedback the next week. Many payers want the evaluation codes billed with the date the evaluation was completed, usually the feedback session. Payer policies differ, so confirm this before the first claim, and make sure the authorization covers that date.
Who can bill testing codes
- Psychologists and neuropsychologists bill the full set of codes.
- Psychiatrists and PMHNPs can bill testing codes when testing is within their scope, though most refer it out.
- Technicians and psychometrists give tests under a psychologist's supervision. Their time is billed with 96138 and 96139 under the supervising provider, never with the professional codes.
- LCSWs, LPCs, and LMFTs are limited by state scope of practice and by payer policy. Some payers restrict testing codes to psychologists entirely. Check both before scheduling.
Our article on who can bill for mental health services covers provider eligibility by license type.
96127: brief screenings are not testing
96127 is the brief emotional or behavioral assessment code, used for standardized screening tools like the PHQ-9, GAD-7, or a short ADHD rating scale. It's billed per instrument, with units, alongside the visit code. It isn't a substitute for 96130–96139, and it doesn't need the same documentation. A practice that screens every intake but never bills 96127 is leaving small, steady revenue unclaimed. Check each payer's unit limit first.
Prior authorization: where most testing revenue is lost
Most commercial plans and behavioral health carve-outs require prior authorization for psychological and neuropsychological testing. The authorization usually approves a specific number of units per code, not "an evaluation." The common failures:
- Testing given before approval. Retroactive authorization for testing is rarely granted.
- More units billed than approved. The excess denies, and the patient usually can't be billed for it under the network contract.
- Authorization under the wrong payer. The commercial plan approves, but the member's behavioral health benefits are managed by Optum, Carelon, or another MBHO, which never received the request. Our guide to MBHO carve-outs explains how to tell.
- Medical necessity not established. Payers deny testing that looks educational (learning disability testing for school accommodations) or that repeats a recent evaluation. The request should say what clinical question the testing answers and how the result changes treatment.
Build the authorization into scheduling. Don't book the testing appointment until the approved units and date range are on file, and compare the planned battery to the approved units before the patient arrives.
Other denials we see on testing claims
- An add-on code billed without its primary code on the same claim.
- Technician time billed under 96136 instead of 96138.
- Units that don't match the documented minutes.
- The diagnostic intake (90791) and testing billed in a way the payer treats as duplicate assessment on the same day.
- The rendering psychologist not credentialed with the plan that actually processes behavioral health claims.
Getting testing billed correctly
Testing is worth offering only if it gets paid, and that depends on authorization, unit tracking, and documentation lining up for every evaluation. Sharp Networks Group provides mental health billing services for psychologists and group practices that offer testing, including authorization tracking by unit and date, inside the EHR you already use. Schedule a consultation and we'll review your recent testing claims with you.