CPT Code 97151: Behavior Identification Assessment
Reviewed against AMA CPT and CMS guidance. See sources.
What is CPT 97151?
CPT 97151 is the behavior identification assessment in ABA, performed by a physician or other qualified health care professional such as a BCBA. It is billed in 15-minute units and can include face-to-face assessment with the client and caregivers plus non-face-to-face time analyzing data, scoring, and writing the report and treatment plan.
Comprehensive behavioral assessment by a qualified health care professional, typically a BCBA. Includes interviews, direct observation, standardized assessments, functional behavior assessment, and development of the treatment plan. This is the foundational assessment code for ABA services.
Time Requirements
Per 15 minutes of the qualified professional's time. Under the CPT time rule a unit is generally met once 8 minutes have passed, though payers may set their own unit rules. Total units are set by authorization.
Modifiers
| Code | Description |
|---|---|
| 96 | Habilitative services (some payers require it on ABA claims). |
| HM to HP | Clinician education level modifiers some Medicaid programs require: HM (less than bachelor's), HN (bachelor's), HO (master's), HP (doctoral). |
Billing a session by video or phone? See telehealth modifiers 95, 93, GT and POS 02 vs 10.
When to Use
- Initial ABA assessment for a new client
- Functional behavior assessment (FBA)
- Reassessments required for treatment plan updates
- Assessment work that leads to an intervention plan
When Not to Use
- Assessment activities carried out by a technician: use 97152
- Direct ABA treatment: use 97153 or 97155
- Caregiver training: use 97156
What to Document for CPT 97151
- Assessment methods used (interviews, direct observation, standardized assessments, FBA)
- Face-to-face and non-face-to-face time, with start and stop times
- Findings and baseline data
- Recommended goals, service hours, and treatment plan
- Caregiver involvement
Common Denial Reasons
- Units exceed the authorized assessment amount
- Documentation missing required assessment components
- Billed by a provider without BCBA or equivalent credentials
- Reassessment repeated sooner than the payer allows
Payer Notes
Prior authorization is almost always required. Payers authorize a set number of units for initial assessments and reassessments, and many require reassessment about every six months. Amounts vary widely by payer and state.
ICD-10 diagnosis codes
Every claim pairs the CPT code with the diagnosis the clinician documented. See the mental health ICD-10 code reference or a condition guide:
Related Codes
Frequently Asked Questions
How many units of 97151 can I bill for an initial assessment?
It depends on the authorization. Payers set the number of assessment units for initial assessments and reassessments, and amounts vary widely. Request authorization before the assessment and stay within the approved units.
Does report writing count toward 97151?
Yes. CPT includes non-face-to-face time spent analyzing past data, scoring and interpreting assessments, and preparing the report and treatment plan. Some payers limit how much non-face-to-face time they pay, so check the policy.
Can an RBT bill 97151?
No. 97151 is performed by a physician or other qualified health care professional, such as a BCBA. Assessment work done by a technician under BCBA direction is billed as 97152.
What is the difference between 97151 and 97152?
Who performs it. 97151 is the qualified professional's assessment time. 97152 is supporting assessment done face-to-face by a technician under the professional's direction.
Sources: American Medical Association (AMA), CPT Professional codebook: code descriptors, psychotherapy time rules, and add-on code guidance. Centers for Medicare & Medicaid Services (CMS): Medicare Physician Fee Schedule and National Correct Coding Initiative (NCCI) policy. Behavior Analyst Certification Board (BACB): RBT supervision requirements. CPT revises the adaptive behavior codes (97151 to 97158) and adds new codes effective January 1, 2027. This page reflects the codes in effect through 2026.
- AMA: CPT overview
- CMS: National Correct Coding Initiative (NCCI) edits
- CMS Medicare Coverage Database: Billing and Coding, Psychiatry and Psychology Services (A57480)
- CMS: Physician Fee Schedule relative value files
- CMS MLN901705: Telehealth and Remote Monitoring (PDF)
Payer rules vary. Confirm coverage, time, modifier, and documentation rules with each payer before billing. This page is general education, not billing or legal advice.
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