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In December 2024, HHS OIG released one of the most important ABA Medicaid audit reports to date, revealing $56.5M in improper payments to ABA providers in Indiana.
This was part of a larger OIG review series focused on improper Medicaid claims for ABA services in both Indiana and Wisconsin. The report followed similar findings in Wisconsin and marks the start of a multi-year federal enforcement cycle that will strengthen through 2026.
What’s Behind Indiana’s ABA Fee-for-Service Payment Scrutiny
According to the HHS Office of Inspector General audit, Indiana’s fee-for-service Medicaid payments for Applied Behavior Analysis (ABA) increased from about $14.4 million in 2017 to $101.8 million in 2020, making it the second-highest ABA spending state in the nation at that time. This shows rapid program growth with inadequate oversight.
Every one of the 100 sampled enrollee-months had at least one improper or potentially improper claim.
The OIG’s recommendations included recovering $39.4M immediately and conducting broader reviews.
These findings are not isolated. They show the same vulnerabilities we see in ABA organizations nationwide.
Key Findings from the Audit: Where Things Went Wrong
According to the OIG report, here are the most common deficiencies found:
- Inadequate documentation and unsupported billing codes
- Session notes often lacked enough detail to support billed CPT codes (for example, codes for ABA therapy), the number of units billed, or even the dates of service.
- Improper or missing provider credentials and supervision
- Many billed services were provided by staff without the required credentials or supervision. Claims were submitted under qualified providers or unqualified staff.
- Billing of non-therapeutic or unallowable activities
- Some claims included time for meals, naps, recreational or academic activities, or other non-therapy time as if they were billable ABA therapy sessions.
- Lack of oversight and guidance from the payer or state agencies
The audit found that the state Medicaid program had not set clear guidance for ABA documentation, provider credentials, or conducted periodic post-payment reviews to identify improper claims.
As a result, the OIG recommended that Indiana refund about $39.4 million (Federal share) for confirmed improper payments, with additional reviews pending on another large amount labeled potentially improper.
Why this matters:
This isn’t just a single misbilling finding; it’s a systemic issue. The number and consistency of the errors point to weaknesses in documentation, billing practices, supervision, and compliance protocols across ABA providers.
For ABA practices, this audit marks a major change: ABA practices need to improve billing compliance or face serious financial and regulatory consequences.
2026 looks to be the year when payers shift from warnings to active enforcement. This includes:
- real-time documentation audits
- credentialing revalidations
- increased pre-payment reviews
- aggressive post-payment recovery initiatives
- mandatory provider-level compliance attestations
What This Means for ABA Practices
ABA organizations now face a three-layered risk environment:
1. Financial Exposure
Recoupments from past years could reach 5 to 15 percent of historical Medicaid revenue if there are gaps in documentation. The Indiana audit alone recommended $39.4 million in immediate federal recoupments.
2. Operational Disruption
New payer rules mean:
- more frequent pre-payment reviews
- tougher prior authorization renewals
- stricter credentialing validations
- quicker suspensions of billing privileges for non-compliance
3. Denials Surge
Many ABA providers have already observed:
- an 18% to 27% increase in medical-necessity denials
- a 20% to 30% increase in documentation-related rejections
- a 10 to 15 day increase in AR cycle times for ABA Medicaid claims
The OIG report is speeding up these trends.
Implications for ABA Revenue Cycle Management Team
For ABA billing teams that manage billing and compliance for an ABA practice or network, the audit’s findings carry serious short-term and medium-term consequences:
Financial Risk and Recoupments:
Practices may face forced refunds for overpayments, clawbacks, or repayments to Medicaid. Given the magnitude (tens of millions of dollars), even small practices could face proportionally large recoveries if documentation is weak.
Increased Denials and Claim Rejections
Expect payers, like state Medicaid or managed care plans, to tighten prior authorization, documentation checks, and credential validation. Claims with weak documentation will likely be denied, delaying cash flow.
The Optum 2024 Revenue Cycle Denials Index
Regulatory and Compliance Burden
Heightened oversight may prompt state Medicaid agencies and federal auditors to demand more rigorous documentation, auditing, and compliance systems.
Operational Impact: Staffing and Training Pressure
Staff who are not credentialed or are under-supervised will need retraining, credentialing, or reassignment. Session-footnote practices may have to be redesigned to only capture allowed therapeutic activities.
Reputation and Risk of Enforcement Actions
While the audit didn’t necessarily find “fraud,” the discovery of systemic non-compliance raises the risk of future investigations, reputational harm, or even enforcement actions, especially if improper billing continues. Thus, compliance, not volume, will likely become the measure of success.
How To Prepare Your ABA Practices for 2026 Audit Readiness
Here’s a practical action plan for ABA practices that want to prepare for audits and secure their billing operations for the future:
Conduct an internal audit ASAP
Sample a representative set of claims from the past 12 to 24 months. Review session notes, CPT codes, units billed, provider credentials, and therapist supervision records. Compare billed therapy with delivered therapy.
Flag claims with missing or weak documentation, non-credentialed staff, non-therapeutic time billed, overlapping service times, excessive units, and incorrect CPT codes.
Strengthen documentation standards and workflows
Develop or update session-note templates to require minimum standards. Include a detailed description of therapy or activities, start and end times, units, therapist name and credentials, signature, parent or guardian sign-off if needed, and progress notes linked to treatment plans.
Train all therapeutic staff, including BCBAs, RBTs, and therapists, on documentation compliance, CPT-code use, allowable billable activities, and expectations for supervision or co-signatures.
Credentialing and supervision compliance
Ensure all staff providing billable ABA services are properly credentialed or licensed according to payer or state requirements.
Enforce a supervision structure. Make sure that sessions billed under supervisory codes are overseen by qualified supervisors. Maintain logs of supervision sessions and witness therapy if required by regulation.
Implement pre-billing and claim scrubbing controls
- Before submitting a claim, run an internal “pre-claim audit.” Verify the completeness of documentation, compare units, check for non-therapy time billing, and cross-check provider credentials.
- Consider using compliance software or RCM tools designed for ABA therapy to automate these checks, reduce human error, and standardize submissions.
- Establish post-payment review and compliance monitoring
- Periodically, either quarterly or bi-annually, sample paid claims to confirm ongoing compliance.
- Document corrective actions, retraining, provider remediation, and improvements in internal compliance policies.
- Engage stakeholders: clinical, billing, legal, and leadership
- Share audit findings, risks, and internal compliance plans with executive leadership and clinical directors to secure support.
- Work with clinical teams to create a compliance culture that goes beyond paperwork. Align therapy delivery, documentation, and billing.
- Prepare for external audits and payer scrutiny
- Retain documentation, including session notes, credential files, timetables, and supervision logs, for a reasonable audit-retention period.
- Build relationships with payers and state agencies. Seek clarification on documentation and billing rules, and stay up-to-date with changes in regulatory guidance.
Why This Matters: Strategic and Long-Term Considerations
Sustainability Over Scale: As payer scrutiny grows, ABA practices must realize that growth won’t just come from more clients. Sustainable practices will standardize compliance, keep documentation clean, and lower risks.
Competitive Advantage: Practices that build strong compliance systems for documentation, credentialing, and billing will likely handle audits well, while others may face recoupments, denials, or removal from payer networks.
Risk Mitigation and Organizational Resilience: A solid internal compliance program protects against financial risks, damage to reputation, and possible regulatory actions.
Quality of Care and Compliance Synergy: Better documentation and proper supervision often lead to higher-quality therapy, improved outcome tracking, and greater accountability, benefiting clients, payers, and providers alike.
The 2026 Advantage: Automation, AI, and Audit-Ready Processes
ABA organizations working manually are more vulnerable as Medicaid audits start using algorithms. BillingParadise enables your practice to thrive by providing:
- AI-powered compliance monitoring
- Automation-focused revenue cycle management workflows
- Optimization of CentralReach, NextGen, eClinicalWorks, and Epic
- Real-time dashboards for denial intelligence
- Predictive alerts for finances and compliance
- User-friendly documentation tools
In 2026, being ready for audits will not just protect your practice; it can also help optimize revenue.
How Can ABA Practices Prepare for Audits in an AI-Driven Compliance Era
ABA organizations are facing a new enforcement environment. Medicaid programs, MCOs, and federal auditors are increasing their oversight on documentation, supervision, time-tracking accuracy, and medical necessity validation.
By integrating AI-powered audit-proof workflows, automation-focused revenue cycle management, and real-time compliance insights into their daily billing processes, ABA providers can effectively manage risks.
By combining real-time AI claim validation, advanced automation tools (such as CentralReach-connected automation), therapist-friendly documentation guidance, integrated EHR workflows (including systems like NextGen, eClinicalWorks, and Epic), and always-on revenue-cycle intelligence dashboards, ABA leaders can work confidently, reduce risks, and safeguard their revenue.
In 2026’s tougher audit environment, being audit-ready is not optional; it is a competitive and financial advantage.
From Alarm to Action: Make 2026 the Year Your ABA Practice Gets Audit-Strong
The OIG’s $56 million finding is not just a headline. It marks a key moment for the ABA industry. For ABA Practices, it signals a change where billing compliance is essential for organizational survival.
If you view billing as just a formality or a task to complete, your practice may be at risk. However, if you see it as a vital part of patient care, documentation, and compliance, you turn billing into a strength. It becomes a source of stability, trust, and sustainable growth.
