CPT Code 97155: Adaptive Behavior Treatment with Protocol Modification
Reviewed against AMA CPT and CMS guidance. See sources.
What is CPT 97155?
CPT 97155 is adaptive behavior treatment with protocol modification, delivered face-to-face with one client by a BCBA or other qualified professional. It covers adjusting treatment protocols during the session and can include directing a technician at the same time. It is billed per 15 minutes and is often reported alongside a technician's 97153.
ABA treatment by a qualified professional that involves direct client contact and modification of the treatment protocol, including real-time adjustments based on client data and direction of the technician during the session.
Time Requirements
Per 15 minutes of face-to-face time with one client. Payers may set their own unit rules.
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
- BCBA directing a technician during a client session and adjusting the protocol
- BCBA-led treatment sessions that involve protocol modification
- Demonstrating a modified protocol to a caregiver while working with the client
When Not to Use
- Caregiver training focused on guiding the caregiver: use 97156
- Supervision meetings or planning without the client
- Technician treatment that follows the existing protocol: use 97153
- Assessment services: use 97151
What to Document for CPT 97155
- What was modified and why, based on client data
- Direction given to the technician, if present
- Client response
- Start and end times
Common Denial Reasons
- Documentation does not describe protocol modification
- Units exceed authorized amounts
- Concurrent billing with 97153 where the payer does not allow it
- BCBA credentials not on file with the payer
Payer Notes
Payer rules on the ratio of 97155 to 97153 vary. The BACB requires RBTs to receive supervision for at least 5% of their service hours each month, but that is a credentialing rule, not a billing rule. Some payers set their own minimums or maximums for 97155.
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
Can 97155 overlap with 97153 for the same time?
Yes, when the BCBA directs the technician during the session in which the technician provides 97153. CPT allows both to be reported for that time. Some payers restrict concurrent billing, so check the policy.
Can 97155 be billed without the client present?
No. 97155 is face-to-face with one client. Supervision or planning without the client is not billed as 97155, and caregiver guidance is billed as 97156.
Is RBT supervision the same as 97155?
Not exactly. The BACB supervision requirement for RBTs is a credentialing rule. 97155 is billable only when the BCBA provides face-to-face treatment with protocol modification, which may include directing the RBT.
What is the difference between 97155 and 97156?
97155 is treatment with one client where the BCBA modifies the protocol. 97156 is guidance for parents or caregivers, with or without the client present.
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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