The ABA Coding Coalition’s 2027 supplemental guidance explains how the new codes are reported, from 97180’s weekly claim to the end of the group-size cap.
Key Takeaways
- The reporting rules sit in the AMA’s codebook. The six new ABA codes are defined, with explicit reporting instructions, in the copyrighted 2027 CPT® Professional Edition.
- The Coalition’s October 5 guidance walks through them. It explains “analysis,” limits 97155 to directing a technician, and removes the eight-patient cap on group codes.
- 97180 is billed weekly, and cost sharing can follow. A week of non-face-to-face QHP work goes on one claim line, and the plan’s deductible or copay may apply to it.
- Payers still set their own clocks. The T codes get no grace period, and the Coalition says one state Medicaid agency will not act until the Medicare final rule, expected in early November.
On October 5, the ABA Coding Coalition posted a 34-page document to its website beneath a two-sentence announcement. Its title is Supplemental Guidance on Interpreting and Applying the Revised 2027 CPT Codes for Adaptive Behavior Services, and its cover is dated January 2027, the month the codes take effect. For the clinicians, billers, and payers who will work with those codes, it is the most detailed public account so far of how they are meant to be reported.
The American Medical Association released the 2027 code set on September 9, adding six codes to the adaptive behavior family, deleting the temporary Category III codes 0362T and 0373T, and narrowing 97155, as Acuity reported at the time. The code numbers and descriptors circulated within days. The definitions and reporting rules that govern them sit in the AMA’s copyrighted codebook, and the Coalition scheduled three webinars in late September to walk providers, billers, and payers through them. The supplemental guidance is the written version, free to download and organized code by code, with a typical patient vignette, clinical examples, and questions and answers for each.
The Coalition, made up of representatives of ABAI, APBA, the BACB, and CASP along with two consultants, according to its website, presents the document with a caveat. A footnote says its clinical examples and FAQs illustrate common applications of the code descriptors and are not intended to establish medical necessity criteria, staffing practices, or treatment or documentation standards. Services should still be individualized, it says, based on the patient’s clinical needs, payer policy, and the professional judgment of the clinician. Within those limits, the guidance answers several questions the field has been asking since CMS printed the new descriptors in its proposed Medicare Physician Fee Schedule in July. Acuity requested comment from Coalition representatives; the Coalition had not provided a response by publication.
How the 2027 ABA CPT Codes Define “Analysis”
The change the guidance singles out first is a single word. In the descriptor of every code administered by a physician or other qualified health care professional (QHP), “protocol modification” has been replaced with “analysis,” a revision the Coalition calls essential for providers and health plans to note.
As the guidance describes it, analysis is cognitive work the QHP performs while delivering a service: observing how a patient or caregiver responds to an assessment or treatment protocol and deciding whether targets or protocols need adjusting. It requires a QHP’s training and may not be performed by a technician. It also does not have to produce a change. Adjustments are not required to report the six codes that include analysis (97155, 97156, 97157, 97158, 97173, and 97180), but the analysis must be documented in the session note, and when a QHP decides a protocol is working, that decision belongs in the record as well.
The guidance also separates thinking from rewriting. Analysis during a face-to-face session is part of that session’s code. Revising the written protocol, goal, or target afterward is reported separately under 97180, work the Coalition’s crosswalk lists as not separately reportable under the 2019 code set. The wording matters for documentation. Under the old language, federal auditors reviewing state Medicaid ABA claims read “protocol modification” strictly, expecting session notes to describe what had actually been modified.
CPT 97180 Billing: Weekly Claims, Patient Cost Sharing, and What the Code Excludes
Code 97180 covers five kinds of non-face-to-face QHP work: reviewing data and session notes, deciding whether to modify treatment targets or protocols, deciding whether more assessment is needed, developing a discharge or transition plan, and training technicians on treatment targets or revised protocols. The Coalition’s September 11 crosswalk had already said the code may be reported once a week by summing the preceding seven days. The guidance describes what that looks like on a claim. Each date of service must be documented individually, and the week’s units go to the health plan together, on one claim line.
That structure carries a consequence for families. According to the guidance, cost sharing (deductibles, copays, coinsurance, and out-of-pocket maximums) may apply to 97180 under the patient’s benefit plan, and the patient’s absence, or the absence of any face-to-face service that day, does not decide the question. Because the units are reported together, the cost share attaches to one date of service rather than to each day the work occurred. In one example the guidance offers, five hours of data review, treatment plan updates, and technician training spread across a Monday, Wednesday, Thursday, and Friday become 20 units billed on Friday.
The guidance is as specific about what 97180 excludes. Writing session notes does not count. Neither does reading journal articles, setting up a treatment space, general training on behavior-analytic principles or employer policy, meeting with daycare or day-program staff, or coordinating care with physicians, speech-language pathologists, or other providers. Reviewing notes for audit or compliance purposes is excluded, as are administrative discharge tasks such as preparing payer notices or emailing a patient’s parents. When a QHP trains technicians, only the QHP’s time is billed. That training is not limited to new hires; patient-specific retraining on an existing protocol qualifies. And 97180 may not be reported on the same day as the assessment code 97151 for the same patient.
The guidance sets no expected volume for 97180. Authorization should rest on the individual patient’s medical necessity, it says, and requests should be individualized, with no prescribed formula. That puts weight on the treatment plan, where Magellan and CentralReach behavior analysts have said medical necessity denials usually start. The guidance cites the CASP practice guidelines as describing an average of one to two hours of QHP activity for every ten hours of technician-delivered treatment, and adds that the figure is not meant to prescribe use of any one code.
CPT 97155, 97173, and ABA Concurrent Billing Rules for 2027
The guidance is direct about 97155: it is no longer a dual-use code. It now covers a QHP directing a technician face to face while the technician delivers a service to the patient, and under the 2027 set it will always be reported alongside a technician code (97148, 97149, 97153, 97154, 97159, or 97160). When a QHP treats a patient directly without a technician, the service is 97173. The two cannot be billed concurrently, the guidance says, because 97173 already includes the QHP’s analysis.
The guidance confirms that 97153 and 97155 may be reported concurrently when both descriptors are met, though a single QHP may not report both. That pairing has drawn attention since several payers, including Vermont Medicaid, restricted concurrent billing of treatment codes. Elsewhere in the document, the Coalition notes that HIPAA does not determine whether a payer covers a code or what it pays. On commercial plans, concurrent billing rules often sit in plan documents that the standard electronic eligibility check does not reliably return. Other pairings are closed. A QHP who attends a technician’s 97152 supporting assessment cannot bill for that time. In one of the guidance’s examples, if a technician calls out and a QHP simply runs the session as written, the session is 97153; if the QHP also analyzes the patient’s responses and adjusts, it becomes 97173, subject to any payer modifier requirements.
A sample authorization in the guidance illustrates the arithmetic, and the Coalition stresses that it is an example, not one-size-fits-all guidance. A six-month 2026 authorization with 312 units of 97155 becomes, in 2027, 208 units of 97155 for directing the technician, 104 units of 97173 for direct QHP treatment, and 52 units of 97180, half an hour a week of non-face-to-face work that had no code of its own before. Rates will be set payer by payer, and analyst-level rates have not always moved with technician rates; New Jersey’s analyst pay has held since 2020 even as its technician rate rose.
ABA Group Codes Lose Their Size Cap as Harmful Behavior Gets a Broad Definition
The prior maximum of eight patients for group codes 97154, 97157, and 97158 has been removed. The guidance says the QHP determines group size based on the patients’ treatment needs and that any payer-specific administrative requirements are separate from CPT guidance. Code 97154 is reported for each patient in a technician-led group, but a QHP who joins to direct the technician reports 97155 only for the patients whose treatment they actually addressed. In multiple-family caregiver groups under 97157, one caregiver attending on behalf of three siblings is not counted three times; a session involving a single family belongs under 97156.
For the four harmful-behavior codes that replace 0362T and 0373T, the guidance defines harmful behavior as any behavior that jeopardizes the patient’s health or safety or poses a risk of harm to the patient or others. Its examples extend from self-injury, aggression, and elopement to sleep difficulties, bruxism, inadequate fluid intake, and resistance to dental or medical care. These codes require a customized environment, which, for example, could be the patient’s home, with a wooden bat swapped for a foam one, or a padded treatment room. The QHP must be on site and immediately available, a requirement the guidance says may be met by telehealth where clinically appropriate and allowed by payer policy and state law. Up to five technicians may be reported, and additional technicians may join on an impromptu basis, but only under a protocol that anticipates when they will be needed. The codes should not be reported, the guidance says, simply because an extra technician happened to assist.
Payer and Medicaid Implementation of the 2027 ABA Codes Before January 1
The closing section turns to implementation and describes two timelines. All of the codes in the set are now Category I, and the Coalition says HIPAA requires payers that accept electronic claims to use Category I codes. There is no grace period: 0362T and 0373T are invalid for dates of service on or after January 1, 2027. At the same time, the guidance says payers are not all required to implement the new codes on January 1 and follow their own procedures and timelines.
For commercial plans, the guidance lists loading the codes, publishing billing guidance, updating fee schedules or contracts, and deciding whether existing authorizations that name deleted codes will be honored. For state Medicaid agencies, it sketches a longer sequence: rate development, fiscal and access analysis, a decision on whether a state plan amendment is required, public and tribal processes and CMS approval where applicable, implementation in the state’s claims system, and an updated fee schedule and provider manual. Georgia’s October 1 autism services manual, for example, still listed 0362T and 0373T in its rate appendix. The guidance advises providers to get written confirmation from each payer, before January 1, of implementation timelines, rate changes, and authorization processes.
Asked whether state Medicaid agencies will be ready on January 1, the Coalition said in written responses sent to Acuity on its behalf that “it is still very early in the roll-out process.” Its presentation to health plans, and a follow-up letter announcing the new codes, were released only last week. Among the questions it is putting to payers, the Coalition said, is when they expect to implement the new codes, particularly the replacements for the T codes, so that patients receiving those services do not face a disruption when the old codes expire. One answer has already come back. “One state Medicaid agency has indicated they cannot take action until the final 2027 Medicare Physician Fee Schedule is published,” the Coalition said, referring to a rule it expects in early November. It did not name the state. “We are monitoring to see if other states will take a similar position.”
Medicare itself is a minor payer for ABA. The proposed 2027 Physician Fee Schedule extends carrier pricing for the adaptive behavior codes through 2027. The guidance notes that CMS added the 2019 adaptive behavior codes to its permanent telehealth list in 2026. Whether the six new codes will join them has not yet been decided.
In the meantime, the Coalition recommended four steps for providers. It plans to post a template letter on abacodes.org later this week that providers can use to notify their health plans of the changes and ask when fee schedules will be updated. It advised providers to ask their EMR vendors, and the clearinghouses those vendors use, about their timelines for handling the new codes, to avoid claims processing delays in early 2027. It said its website will be fully updated before January 1, with FAQs and an updated Model Coverage Policy expected this fall. And it urged providers to train clinical and billing staff to report the new codes and to attend webinars hosted by its member organizations.
Near the end of the document, the Coalition anticipates a question from readers who already have its materials: why they would still need the AMA’s. The codebook, it answers, contains information essential to a full understanding of the code set, and because that material is copyrighted, the Coalition cannot distribute it. Everyone who works with the codes, it says, should get the book from the AMA. January 1 is about twelve weeks away.
