An autism evaluation is the front door to every ABA authorization a practice will file. Bill 97151 badly and the loss shows up months later, when a reviewer reads a thin assessment and denies the treatment hours built on top of it. Most of the assessment denials we work start in the note, not in the sessions.
What this covers
- 97151 is the only adaptive behavior code that pays for non-face-to-face time: analyzing data, scoring the assessment and writing the treatment plan.
- 97152 is a separate 15-minute code for the technician’s part of the assessment, not an add-on.
- Maryland Medicaid caps both codes at 32 units a day; Virginia Medicaid sets no limit on the assessment codes.
- The authorization is only as strong as the assessment behind it. Baseline data is what reviewers check first.
97151 pays for the thinking as well as the talking. The record has to show both halves.the only adaptive behavior code with a payable non-face-to-face component
One code carries the downstream revenue of a whole case. Everything a payer later approves or denies rests on the evaluation: the diagnosis, the baseline data and the hours requested.
What 97151 covers, and what it does not
The descriptor is long because the service is long. 97151 is behavior identification assessment, administered by a physician or other qualified health care professional, in 15-minute units. The time has two halves: face-to-face work with the patient and caregiver during testing, and non-face-to-face work analyzing past data, scoring the assessment and preparing the report and plan.
That second half sets the code apart. Treatment codes pay for face-to-face time only, and the chart review, notes and protocol edits around 97153 or 97155 are bundled into their payment. 97151 is the one place a professional’s indirect work is payable, and only for an initial assessment, a reassessment or a plan update.
Day-to-day assessment and planning belongs inside the treatment codes, 97153 through 97158. Adding units of 97151 every week for ongoing assessment is a pattern reviewers look for.
The rest of the package: 97152, the diagnosis and 0362T
97152 is behavior identification supporting assessment, performed by a technician face-to-face with the patient, also in 15-minute units. It is a separate code, not an add-on. Virginia Medicaid’s ABA guidance says the technician only has to be face-to-face with the child, so both codes can be reported for the same period when each documents its own work.
ABA starts with a diagnosis, and most programs require a qualified health care professional to confirm it: a developmental pediatrician, pediatric neurologist, child psychiatrist, clinical psychologist or neuropsychologist completes a comprehensive diagnostic evaluation with a caregiver interview, direct observation and the child’s developmental history. Maryland Medicaid lists the codes that qualify, starting with F84.0.
| Code | Who performs it | Unit | What it pays for |
|---|---|---|---|
| 97151 | Qualified professional, typically a BCBA | 15 min | Face-to-face assessment with the patient and caregiver, plus scoring, record review and the report or plan |
| 97152 | Technician under the professional’s direction | 15 min | Face-to-face supporting assessment and additional observation |
| 0362T | Two or more technicians with the professional on site | 15 min | Assessment of destructive behavior in a customized environment |
For severe destructive behavior the package changes shape. 0362T, a Category III code, needs two or more technicians in a customized environment with the professional on site, defined as immediately available and interruptible.
Units, time and the daily ceiling
Every code in the family is a 15-minute unit. CPT’s Time guidance holds that a unit is attained once the midpoint of the interval passes, which for a 15-minute code means 7 minutes and 31 seconds. Medicare’s 8-minute rule builds therapy units from total minutes instead, at 8, 23 and 38. Payer policy decides which one applies.
Daily maximums matter more than the arithmetic. Maryland Medicaid’s fee schedule effective February 1, 2026 pays 97151 at $38.34 per unit and 97152 at $19.17, with a daily maximum of 32 units each. Virginia sets no unit limit and no prior authorization on the assessment codes, which it restricts to initial assessments and reassessments.
The clinical standard was not written around a 32-unit day. The Council of Autism Service Providers practice guidelines note that a comprehensive assessment may require 20 hours or more and should be spread across multiple days. Twenty hours is 80 units, so a 32-unit cap puts the work across at least three documented dates of service.
Travel, preparation and scheduling are not payable. For 97151 the indirect portion covers analyzing past data, scoring the assessment and preparing the report or plan. Start and stop times beside each activity survive an audit; a note saying the analyst spent eight hours on the case does not.
What a reviewer reads in the assessment
A reviewer looks for what the clinical guidelines ask for: target behaviors defined in observable, measurable terms, a baseline taken from direct observation rather than a caregiver’s summary, the measurement method and settings, and mastery criteria.
- A confirmed autism diagnosis with the code the program recognizes, commonly F84.0
- Operational definitions of each target behavior and the baseline behind it
- The measurement method, settings and observation schedule
- Written protocols, prompt levels and mastery criteria
- Requested hours by code, tied to the clinical picture
- Caregiver participation and a plan to train caregivers
Maryland Medicaid requires treatment plans on the state template: biopsychosocial information, coordination with other providers, direct observations tied to the core deficits of autism, skill acquisition goals and a behavioral intervention plan. Virginia wants the assessment, a preliminary service plan and a discharge plan with the request. Medical coding that ignores the payer’s template is the most common reason a complete assessment still gets questioned.
Why a thin assessment loses the authorization
An authorization request is the assessment recast as a form. When a plan never defines a target behavior in measurable terms, the reviewer cannot justify the intensity requested, and the usual outcome is reduced hours or a denial for lack of medical necessity. Baseline data is the evidence; without it the request is an opinion.
The pressure increased in 2026. CMS released a 173-page toolkit for state Medicaid and CHIP ABA programs in August. Its own figures: ABA spending in Medicaid and CHIP rose 421% between 2021 and 2025, while children with an autism diagnosis receiving services grew 67%. No new federal requirements came with it, but states were handed prior authorization and audit practices to copy.
Virginia requires a request of 20 hours, or 80 units, per week to include the schedule of activities for those sessions and how each supports the treatment goals.
A denial that cites medical necessity is usually a documentation problem. Put the authorization request and the assessment side by side before drafting the appeal; the gap is normally a missing baseline, an undefined target or a rationale nobody wrote down.
Six checks before the claim goes out
None of this needs new software. The evaluation has to be treated as a claim from the moment it is scheduled, which is the habit behind behavioral health revenue cycle management.
Confirm the payer, the plan and whether the assessment codes need prior authorization. The answer changes the intake script.
Have the diagnostic evaluation and the confirmed autism diagnosis in the chart before the behavioral assessment starts, with the ICD-10-CM code the payer expects.
Block enough days to finish the assessment instead of compressing it against a daily cap.
Record what was done and for how long, by activity, on the date it happened. The total has to match the units on the claim.
Use the state or payer template when one exists, and attach the assessment rather than pointing to it.
Maryland Medicaid authorizes ABA for 180 days and requires a reassessment to continue.
One planning note. The CPT Editorial Panel revised the eight adaptive behavior codes in September 2025, deleted 0362T and created six new codes, including a standalone code for non-face-to-face professional work. The changes take effect January 1, 2027; the ABA Coding Coalition advises waiting for the AMA’s published code book before reconfiguring systems. The same coalition reports that all of them sit on Medicare’s permanent telehealth list as of January 1, 2026, and CMS proposes to keep them contractor priced.
Questions billing teams ask about autism evaluations
97151 is behavior identification assessment, billed in 15-minute units by a physician or other qualified health care professional. It covers face-to-face assessment with the patient and caregiver, plus non-face-to-face time spent analyzing past data, scoring the assessment and preparing the report or treatment plan. It is the only code in the set that pays for work outside face-to-face time.
Yes, when each code documents its own work. 97152 is a separate 15-minute code for the technician’s face-to-face supporting assessment under the professional’s direction, not an add-on. Virginia Medicaid allows both codes for the same period and only requires the technician to be face-to-face with the child. Check the specific payer, because concurrent combinations differ between programs.
There is no national answer. Maryland Medicaid publishes a daily maximum of 32 units for 97151 and 97152 in the fee schedule that took effect February 1, 2026. Virginia Medicaid sets no unit limit on the assessment codes and requires no prior authorization for them, as long as they are used for initial assessments and reassessments.
It depends on the program. Virginia Medicaid requires no service authorization for 97151, 97152 or 0362T, while the treatment codes that follow must be authorized. Maryland Medicaid requires prior authorization before any ABA service, and its authorization runs for a maximum of 180 days. Verify the assessment benefit at intake.
Bill it under the professional who performed the service, which in ABA is normally a licensed behavior analyst or a BCBA. Technicians work under that direction and report their own face-to-face time with 97152. Maryland Medicaid reimburses only licensed psychologists, BCBA-Ds and BCBAs directly, and does not let BCaBAs, RBTs or behavior technicians bill at all.
The bottom line
The assessment is the only part of an ABA case where the professional’s reasoning is payable, and it is the document every later authorization is judged against. Bill the time you can support and write the plan the reviewer expects. If the assessment and the claim do not agree, a revenue cycle review usually finds why.
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