ABA Billing Services

ABA billing is built around time. Claims are submitted in 15-minute units, and each unit must match the right code, the right provider level, and an active authorization. A technician, a supervising BCBA, and a caregiver session can all be billed differently on the same day.

That makes ABA medical billing hard to get right. Authorizations run out, unit counts drift from what was approved, and payers differ on who may render which service. Westmont Revenue Partners connects ABA providers with vetted billing experts who know these rules and can keep claims clean from intake to payment.

Who this is for

• Independent ABA agencies and multi-site autism centers
• Solo BCBAs and small group practices starting to bill insurance
• Providers that deliver services in the home, at a center, or in a school-adjacent setting
• Practices that bill both commercial plans and Medicaid
• Owners growing a team of RBTs and supervisors

What gets billed

• Initial behavior assessment by a qualified professional
• Supporting assessment administered by a technician
• One-to-one treatment delivered by a technician under a protocol
• Group treatment delivered by a technician
• Treatment with protocol changes led by a BCBA or other qualified professional
• Caregiver guidance for one family
• Caregiver guidance for multiple families in a group
• Group treatment with protocol changes led by a qualified professional
• Reassessments and treatment plan updates
• Authorization requests and renewals
• Telehealth sessions where the payer allows them

Commonly billed codes

Code	Type	What it covers
97151	CPT	Behavior assessment and treatment planning by a qualified professional
97152	CPT	Supporting assessment done by a technician under direction
97153	CPT	One-to-one treatment by a technician following a protocol
97154	CPT	Group treatment by a technician following a protocol
97155	CPT	Treatment where the qualified professional adjusts the protocol
97156	CPT	Guidance and training for a family or caregivers
97157	CPT	Guidance and training for several families in a group
97158	CPT	Group treatment led by a qualified professional with protocol changes
F84.0	ICD-10-CM	Autistic disorder, often the primary diagnosis on ABA claims

Note

Codes are examples for orientation, not a complete list, and do not guarantee coverage or payment. Always check current code sets and payer policy.

Billing challenges in ABA

• Authorization and unit tracking. Payers approve a set number of hours by code. Billing past the approved units gets denied. A good biller tracks units used against each authorization and flags renewals early.
• Rendering provider rules. Some payers require the supervising BCBA to be the rendering provider, while others allow the technician. Billers check each contract and enroll providers correctly.
• Credentialing for every clinician. Payers often credential BCBAs, and sometimes RBTs, before they will pay. Delays leave services unbilled, so credentialing is tracked as part of the revenue cycle.
• Overlapping services. Two codes cannot always be billed for the same minutes. Billers review session notes for overlap between technician time and supervision time.
• Time and unit rounding. Units depend on minutes spent. Payers apply their own rounding rules, so billers check the policy and document start and stop times.
• Medicaid versus commercial differences. Each Medicaid program has its own codes, modifiers, and limits. Billers keep a payer-by-payer rule sheet instead of using one template.
• Code set changes. CMS has proposed new adaptive behavior codes for 2027. Billers watch final rules and payer notices before changing claims or systems.

How Westmont can help

• Matching you with vetted billing experts experienced in ABA and autism services
• End-to-end revenue cycle support, from eligibility checks to payment posting
• Denial management and appeals tied to authorization and unit issues
• Help with payer credentialing and enrollment for your clinicians
• Clear reporting so owners can see where claims are stuck

Frequently asked questions

What is the difference between 97153 and 97155?

Code 97153 is treatment delivered by a technician who follows an existing protocol. Code 97155 is used when a qualified professional is present and changes the protocol during the session. Payers may set different rates and rules for each, so notes should show who did what and why the protocol changed.

Can we bill ABA services while the child is on a waitlist for authorization?

Usually not with certainty. Most payers want approval before services begin, and many will not backdate. Some allow retro requests in limited cases. Check each plan's rules, and confirm in writing before delivering services without an active authorization.

How do I know how many units to bill for a session?

ABA units are generally 15 minutes. Payers differ on how they round partial units, so follow the policy of each plan. Keep clear start and stop times in the session note, and make sure the billed units match the time documented.

Do commercial plans and Medicaid use the same ABA codes?

Often they share the same CPT codes, but Medicaid programs may add their own modifiers, limits, or local codes. Rules vary by state and plan. A biller who handles both should maintain separate rule sheets for each payer.

When should we outsource ABA billing?

Many practices consider it when authorizations, credentialing, and denials start to take more time than care delivery. Outsourcing can also help when you add sites or payers. Ask any billing partner how they track units and authorizations.

Related billing services

• Psychology Billing
• Counseling & Therapy Billing
• Child & Adolescent Psychiatry Billing
• Speech-Language Pathology Billing
• Occupational Therapy Billing