Can CPT code 97153 and 97155 be billed during the same session?

Yes, but it depends on the payer's billing policy rather than the CPT code itself. Some state Medicaid programs, including Missouri and Texas, allow CPT codes 97153 and 97155 to be billed during the same session when a BCBA is actively providing protocol modification while an RBT delivers direct treatment. Other payers, including Vermont Medicaid, do not allow both codes for the same time block. Always verify the payer's written billing guidelines before submitting a claim.

Does insurance require prior authorization for CPT code 97155?

Most commercial insurance plans and Medicaid programs require prior authorization before billing CPT code 97155. Providers should confirm the approved authorization period, authorized units, payer-specific limitations, and telehealth requirements before delivering services. Billing beyond authorized units or without prior authorization is a common reason for claim denials.

97155 CPT Code Description: Complete ABA Billing Guide, Documentation Requirements & Reimbursement (2026)

Q: Who is qualified to bill CPT code 97155?

CPT code 97155 may be billed only by a Board Certified Behavior Analyst (BCBA), Board Certified Assistant Behavior Analyst (BCaBA), or another qualified healthcare professional recognized by the payer. A Registered Behavior Technician (RBT) cannot bill CPT code 97155, even when working under the supervision of a BCBA. RBT services are typically reported separately using CPT code 97153.

Anne Scholfield
11 minutes ago
4 min read

CPT code 97155 pays for adaptive behavior treatment with protocol modification: the fifteen-minute increments a BCBA bill while actively changing a client's treatment plan in real time, not just watching an RBT run it. Get it right and it often pays more than 97153. Get it wrong (bill it for supervision, chart review or a plan that never changed) and it's one of the fastest ways to trigger a denial or a payer audit.

What is CPT Code 97155?

CPT 97155 describes one-on-one adaptive behavior treatment where a Board Certified Behavior Analyst (BCBA), BCaBA or other qualified healthcare professional (QHP) modifies the treatment protocol face-to-face with the client, based on how the client responds right then. It can include the BCBA directing a Registered Behavior Technician (RBT) at the same time, billed in 15-minute units like most of the ABA CPT codes running from 97151 through 97158.

Who can actually bill it:

A BCBA, BCaBA or other QHP the payer recognizes, never an RBT alone
A provider who is physically present and engaged, not reviewing notes afterward
One-on-one sessions only; group sessions fall under 97154
Sessions with a real, real-time change to the protocol, not routine delivery of an existing plan

97155 vs. the Other ABA Codes at a Glance

The fastest way to catch a coding mistake before it turns into a denial is lining 97155 up against the codes it gets confused with most.

Code	What it covers	Who typically bills it
97151	Initial behavior identification assessment	BCBA/QHP
97153	Treatment by existing protocol, no modification	RBT/technician
97154	Group adaptive behavior treatment	RBT/technician
97155	Treatment with real-time protocol modification	BCBA/QHP
97156	Caregiver and family guidance	BCBA/QHP

What Documentation Does CPT 97155 Actually Require?

A 97155 note has to prove a real change happened. It can't just describe a session that went fine.

"Did the note get filed on time?" That's one bar and most practices clear it. A payer's real question is sharper: "Does this note prove the BCBA changed something, based on data, in that exact session?" One is paperwork. The other is the line between paid and denied.

Every 97155 note needs:

Session date, start time and stop time that match the units billed
The specific change made (prompting strategy, reinforcement schedule, task difficulty) and why
The data or observed behavior that triggered it
How the client responded, in that same session
What it means for the next session's plan

What Reimbursement Looks Like for CPT 97155 in 2026

There's no single national rate here. Medicare doesn't cover ABA for most patients, so every state Medicaid program and every commercial payer sets its own number for 97155.

Florida's 2026 Medicaid fee schedule pays $19.17 per 15-minute unit for 97155, versus $12.26 for 97153, dropping to $15.37 when a BCaBA bills under modifier HN. Credential-level modifiers matter beyond Florida too: HN for bachelor's level, HO for master's or QHP, HP for doctoral. Bill under the wrong one or let provider credentialing lag behind who's actually in the room and you quietly lose money on every claim, not just an occasional one.

State rules on billing 97155 also get contentious. CPT's own language allows a BCBA to bill 97155 while directing a technician billing 97153 in the same session and Missouri and Texas Medicaid allow this when the BCBA is on-site and actively modifying the protocol live. Vermont ruled the opposite way in 2026, saying concurrent billing for the same child in the same block doesn't meet AMA guidance. Get any payer's policy on this in writing and confirm prior authorization and unit caps before the session, since both shift by payer as often as the rate does.

FAQs

Can 97153 and 97155 be billed for the same session?

It depends on the payer, not on CPT alone. Some state Medicaid programs, including Missouri and Texas, allow it when the BCBA is on-site and actively modifying the protocol. Others, including Vermont, disallow it for the same time block. Confirm the payer's written policy first.

Who is qualified to bill CPT code 97155?

Only a BCBA, BCaBA or other qualified healthcare professional the payer recognizes, per guidance from groups like the ABA Coding Coalition. An RBT present during the session cannot bill under this code even while being directed by the BCBA. Their time is billed separately under 97153.

Does insurance require prior authorization for CPT 97155?

Nearly every commercial and Medicaid payer requires prior authorization for 97155, with authorized units tracked per authorization period. Confirm authorization status, unit caps, and telehealth restrictions before the session. Exceeding authorized units is a leading cause of ABA claim denials.

Getting 97155 Right on the First Pass

Most 97155 denials trace back to one of three things: a note that reads like supervision instead of a real modification, a mismatched credential-level modifier, or a payer rule nobody double-checked first. None of those are clinical failures. They're workflow gaps and every one is fixable.

If your team keeps hitting denials on this specific code, that usually means the billing side needs a second set of eyes: whether that's ABA therapy billing services run as a full-time job instead of a side task or a clean pass through last quarter's 97155 claims to find the pattern before it repeats.