97155 CPT Code: What It Covers and How 97153 Differs

97155 is the code behind most of a BCBA's billable day, and it is the one the 2027 code set changes most. If you searched for the 97155 CPT code, you want two answers: what it means today, and what it will mean after January 1, 2027. This guide covers both, explains how it differs from 97153, and flags what depends on the payer. Everything is as of November 2, 2026.

97155 today (2026)

The ABA Coding Coalition's September 11, 2026 conversion table lists the current descriptor: adaptive behavior treatment with protocol modification, administered by a physician or other qualified healthcare professional (QHP), which may include simultaneous direction of a technician, face-to-face with one patient, each 15 minutes. In practice 97155 has been a dual-use code:

• The QHP works one-to-one with the patient, running and adjusting treatment.
• The QHP observes a technician's session and directs it while the patient is present.

Both have lived under one number. It is billed per 15-minute unit, and the Coalition's table shows the people present as the client, the QHP, and sometimes a technician.

97155 from January 1, 2027

The new descriptor in the same table is adaptive behavior direction of technician with analysis by a physician or other QHP, face-to-face with a patient, each 15 minutes. The Coalition's October 2026 supplemental guidance is blunt about the consequence: "97155 is used specifically and only for QHP direction of a technician with patient(s) present." It lists when to report it, always with another code:

Situation	Report 97155 with
QHP joins 2 to 5 technicians and directs a harmful behavior assessment	97148 and +97149
QHP joins a technician and a patient, one-to-one treatment	97153
QHP joins a technician and a group	97154
QHP joins 2 to 5 technicians directing harmful behavior treatment	97159 and +97160

The 2027 CPT code book, quoted in the guidance, lists those same codes (97148, 97149, 97153, 97154, 97159, 97160) as the technician services that 97155 can accompany. And the guidance adds: 97155 "will not be reported on its own under the 2027 code set."

Where the old second use goes: 97173

When the QHP delivers treatment directly to one patient with no technician, the 2027 code is 97173: adaptive behavior treatment with analysis, administered by a physician or other QHP, face-to-face with one patient, each 15 minutes. 97173 and 97155 cannot be reported at the same time, because 97173 already includes the QHP's analysis. 97152 and 97155 cannot be reported concurrently either; the QHP reports the training of a technician on assessment protocols, done without the patient present, with 97180.

What "analysis" means

The 2027 descriptors replace "protocol modification" with "analysis." The guidance defines analysis as the cognitive work the QHP does during face-to-face service: observing the patient's responses to protocols and deciding whether targets or protocols need adjusting. It may or may not result in a change; a change is not required to report the code, but the analysis must be documented clearly in the session note. The act of rewriting a protocol or target is reported separately, with 97180.

97153 vs 97155

	97153	97155 (2027)
Delivered by	Technician	QHP (physician or other qualified healthcare professional)
What it is	Treatment by protocol, one patient	Direction of a technician with analysis, patient present
Unit	15 minutes	15 minutes
Reported alone?	Yes	No, always with a technician code
Can one person bill both for the same minutes?	No. The guidance says a single QHP may not report 97153 and 97155 concurrently.
Can two people bill both at once?	Yes, if both descriptors are met

Our guide to the 97153 CPT code goes deeper on the technician side. Today the 2026 split is blurrier because 97155 covers both uses, which is exactly why the 2027 change matters for authorizations. The Coalition's sample six-month authorization shows 312 units of 97155 in 2026 (208 for directing a technician and 104 for the QHP's own one-to-one work) becoming 208 units of 97155 plus 104 units of 97173 and 52 units of 97180 in 2027. It is an illustration, and the guidance says authorization should follow each patient's medical necessity with no prescribed formula.

Billing 97153 and 97155 together

The commonly asked question, "can you bill 97153 and 97155 together," has this answer: yes for two people, no for one. The Coalition's guidance allows concurrent reporting if the descriptors of both are met. NC Medicaid's October 12, 2026 bulletin under Clinical Coverage Policy 8F says a single rendering provider may not bill 97153 or 97154 and 97155 for the same time period, while permitting 97153 or 97154 with 97155 when a paraprofessional provides the technician service while being observed. Payers add their own ratios, scheduling expectations and prior authorization rules on top of CPT, so confirm yours.

What 97155 does not cover

• Treatment planning while the technician works. The guidance says 97155 cannot be reported for treatment planning done by the QHP while the technician implements treatment; it requires the QHP to be face-to-face and engaged with the technician and the patient.
• Protocol writing and technician training without the patient. These are 97180 activities in 2027, reported weekly.
• Supervision as such. The guidance says supervision activities that do not involve delivering services directly to patients are generally not reportable to health plans with CPT codes, though some payers allow HCPCS or other codes.
• A QHP's time in a supporting assessment. If the QHP chooses to sit in a 97152 session, the guidance says that time is not billable.

Preparing for the change

1. Pull a week of your 97155 notes and mark each as "directed a technician with the patient present" or "treated the patient alone." After January 1 the second pile is 97173.
2. List authorizations running past December 31 that include 97155 and ask each payer in writing how units will convert.
3. Check note templates so the QHP's analysis is documented, including a recorded decision when nothing changes.
4. Review contracts that enumerate codes by number; 97173 and 97180 will not appear in them.

The full list of changes, with a crosswalk and a timeline, is in our guide to the ABA CPT code changes for 2027; the rest of the family is on the ABA CPT codes page. A code number is not a rate, and CMS's proposed 2027 fee schedule leaves these codes carrier-priced, so rates are still negotiated payer by payer.

Four worked examples (hypothetical)

These are illustrations of how the Coalition's 2027 rules read, not payer guidance. Your payer's policy decides.

1. A BCBA joins an RBT's session to coach for 30 minutes. The RBT's time is 97153. The BCBA's 30 minutes is 97155 (two units), reported with the technician code. In 2026 and 2027 this pairing looks the same on paper, but 2027 makes the pairing mandatory for 97155.
2. A BCBA works alone with a client for an hour. In 2026 this is commonly four units of 97155. From January 1, 2027 it is four units of 97173, because no technician is being directed.
3. A technician calls out and the BCBA runs the session as written. The guidance says to report 97153 when the QHP simply serves as a proxy. If the BCBA is also analyzing whether targets or protocols need to change, 97173 is the code.
4. Thursday afternoon, the BCBA reviews the week's data for 40 minutes and trains a technician on a revised protocol for 20 minutes, with no client present. In 2026 neither is separately reportable. In 2027 these are 97180 activities; the minutes are summed over the seven-day reporting period (for example, Sunday to Saturday) with each date documented, giving 60 minutes, or four units, reported once for the week.

Documenting a 97155 session

A note that supports the code names the technician and the QHP, records the start and stop times of the QHP's face-to-face time, describes what the QHP observed, what direction was given, and records the analysis, including a decision that nothing needed to change. It should be possible for a reviewer to separate the technician's 97153 minutes from the QHP's 97155 minutes without guessing.

Sources, with dates

• ABA Coding Coalition, 2027 CPT Code Crosswalk and conversion table, September 11, 2026 (abacodes.org).
• ABA Coding Coalition, Supplemental Guidance on the 2027 CPT Codes, posted October 5, 2026.
• NC Medicaid, concurrent billing clarification, October 12, 2026.
• APBA summary of the ABA Coding Coalition note on the CMS proposed 2027 fee schedule, July 15, 2026.

Payers differ. This is education, not billing advice; the AMA's CPT 2027 Professional book is the authority on code language.