Key Takeaways
- MassHealth conducted a retrospective audit of calendar year 2024 ABA Medicaid claims and directed Carelon Behavioral Health to issue recoupment letters to Massachusetts providers in late February 2026, setting a 30-day payment deadline.
- Providers had 30 days to remit payment and 60 days to file a dispute, but Carelon’s letter stated explicitly that filing a dispute would not suspend its right to collect, meaning payment was due before any appeal could be resolved.
- The performance specifications MassHealth cited as the audit’s legal basis could not be produced as a 2024-dated document
- Point32Health/Tufts Health Plan formally disputed the audit methodology in a February 2026 letter to MassHealth, describing it as potentially flawed, identifying H0031-U2 as an excluded supervision code, and warning of perverse incentives the methodology created for ABA providers.
- MPAAQ and MassABA engaged the law firm Krokidas & Bluestein, which, in March, demanded cancellation or suspension and threatened declaratory and injunctive relief if no response was received by April 2.
- CASP and multiple advocacy organizations have proposed that the forthcoming ACQ accreditation requirement serve as the primary framework for evaluating ABA supervision quality, arguing it offers a more accurate and less disruptive alternative to retrospective claims ratio analysis.
- As of publication, MassHealth has not publicly responded to the legal demands filed by Krokidas & Bluestein; the April 2 response deadline in the litigation threat letter has passed; a legislative liaison in the Secretary’s office has acknowledged the coalition letter but offered no timeline for provider engagement, and providers await court action or a negotiated resolution.
In the compressed vocabulary of Medicaid administration, the word “recoupment” carries an air of procedural tidiness. It suggests a corrective mechanism, a system functioning as designed, errors being undone. What it does not suggest is what Applied Behavior Analysis providers in Massachusetts experienced in late February 2026: the arrival, without warning or prior engagement, of letters demanding that they return reportedly hundreds of thousands of dollars within thirty days, for services they had delivered under authorized treatment plans, to children whose care had already been reviewed and approved by the managed care entities now demanding repayment.
The letters, issued by Carelon Behavioral Health at the direction of MassHealth, were grounded in a retrospective audit of 2024 ABA claims. MassHealth had reviewed encounter data for the full calendar year and concluded that certain providers had billed for too few hours of Licensed Applied Behavior Analyst supervision relative to the direct treatment their behavior technicians delivered. The standard it applied: at least one hour of LABA supervision, billed under CPT code 97155, for every ten hours of direct service billed under CPT code 97153. Providers who fell below that threshold were notified of overpayments. Providers who fell significantly below it (with supervision representing less than five percent of their direct service hours) were told that every dollar they had received for direct services was recoverable. The deadline for payment was March 27. The deadline for filing a dispute was April 26. The letters were explicit that a dispute would not suspend Carelon’s right to collect.
“It’s jarring,” said Melanie Olson Giles, PhD, BCBA-D, LABA, CCC-SLP, owner and clinic director of Speech Therapy Group and The Verbal ABA Clinic and a member of the Council of Autism Service Providers. “Massachusetts is usually the first to set a precedent and to do really great things in healthcare. This is out of character: just throwing an audit out there without any rhyme or reason, with problems in the methodology and problems with due process.” Giles, who has operated her speech therapy practice for twenty-two years and added an ABA clinic nearly eight years ago, said the recoupment had forced her to evaluate where to cut in the near term and where to cut over the longer run. She was not alone in that calculation.
How MassHealth’s 2024 ABA Supervision Audit Works: The Methodology, the Missing Performance Specifications, and a Payment Deadline That Expired Before Providers Could Meaningfully Appeal
MassHealth’s audit examined 2024 managed care encounter data across six health plans that administer its ABA behavioral health benefits: Fallon, Health New England, MBHP, WellSense, Tufts Health Plan, and Optum. As of publication, recoupment letters have been issued through the first four plans; providers covered by Tufts Health Plan and Optum have not yet received letters, though MassHealth conducted the same analysis for both. The methodology focused exclusively on the ratio of paid units for CPT 97153 to paid units for CPT 97155, calculated at the provider-member-MCE level across the full calendar year. Providers whose ratios fell between 10:1 and 19:1 (that is, between approximately five and ten percent supervision) were assessed a partial overpayment covering the hours of 97153 above the 10:1 threshold. Providers whose ratios reached 20:1 or higher (below five percent supervision) were assessed the full cost of all 97153 services delivered to the affected member. MassHealth did not identify overpayments at the level of individual claims.
Under the contract terms governing the relationship between MassHealth and its managed care partners, health plans that failed to recover identified overpayments from providers faced the deduction of 100 percent of unrecovered amounts from their capitation payments. The structure left health plans little practical latitude to dispute MassHealth’s findings without absorbing the financial consequences themselves. At least one major managed care entity did dispute the findings in writing, a development addressed below.
The stated basis for the recoupment was the 2024 ABA performance specifications. Providers who asked to see the document encountered a problem: neither Carelon nor MassHealth could produce a copy of the specifications dated to 2024. The Massachusetts Providers for ABA Access and Quality (MPAAQ), the Massachusetts Association for Applied Behavior Analysis (MassABA), and BABAT (Massachusetts Professionals in Behavior Analysis) stated in a March 11 coalition letter that the only version their organizations had received, despite repeated requests, was dated January 1, 2025. Carelon initially directed providers to the 2025 version; after providers objected, they were told the December 2023 specifications governed.
The procedural asymmetry drew particular objection. Providers had thirty days to remit payment and sixty days to file a dispute, but the Carelon letter stated that a dispute “shall not suspend Carelon’s right to recoup the overpayment amount during the dispute process.” A provider that chose to contest the finding would be required to pay before the contest was resolved, without claim-level data on which to base an appeal. At least one provider reported that funds were withheld from a claims payment approximately two days before the stated March 27 deadline, suggesting collection activity began even before the notice period expired. This recoupment structure stands in contrast to the approach documented in Acuity’s earlier coverage of ABA billing audits across Indiana, Wisconsin, and Maine, where the federal oversight process followed sequential review and response windows before financial recovery began.
What followed the arrival of the recoupment letters was a rapid mobilization. Trade associations filed coalition letters. A managed care entity formally disputed the methodology. Attorneys were retained and public records requests submitted. By the time the March 27 deadline arrived, a litigation threat letter had been sent to Carelon by the law firm Krokidas & Bluestein, which demanded cancellation or suspension of the recoupment and set an April 2 response deadline. As of this writing, no public response from Carelon or MassHealth has been received.
The mobilization has a direct historical precedent in MassHealth’s own prior conduct. On February 28, 2018, Daniel Tsai, then serving as MassHealth’s Assistant Secretary and Medicaid Director, sent a letter to MassHealth’s managed care entities ordering them to immediately pause behavioral health audit activities and suspend execution of all recoupments that had been noticed but not yet collected from providers. The reason Tsai cited: MassHealth had determined that the audits, conducted by the MCEs’ behavioral health subcontractor, had proceeded with “insufficient engagement and communication with the provider community.” Providers were given until September 1, 2018 to submit documentation resolving identified issues, and Tsai’s letter committed MassHealth to working with managed care plans and the provider and stakeholder community to “outline clear expectations, process, and timelines” before audit activity resumed. Eight years later, providers and their attorneys argue that MassHealth has applied a substantially identical audit structure to its 2024 recoupment: retroactive enforcement without prior stakeholder engagement, no advance communication of the standard being applied as a payment condition, and a payment deadline that precedes any meaningful provider input.
Why Providers, a Health Plan, and Attorneys Say the ABA Supervision Audit Methodology Is Fundamentally Flawed
Even setting aside the procedural objections, the audit’s substantive methodology drew sustained criticism from organizations representing every level of the ABA service delivery chain.
The most fundamental objection concerned what the audit counted as supervision. By limiting its measurement to paid units of CPT 97155, MassHealth excluded a broad range of supervision activities that occur in the ordinary course of ABA service delivery. Providers pointed to H0031-U2, a code used by LABAs for assessment services, as one example of a billable supervision activity the audit ignored. More significantly, certain supervision activities (indirect supervision of paraprofessionals, revision of behavior support plans, review and analysis of data) are bundled into the base rate for 97155, meaning they cannot be billed as separate units even though they constitute clinical supervision.
“There are many other ways we do supervision that are not part of that code,” Giles said. “I could have a tech in there with me, but I’m not billing for supervision because I’m doing it. Or I could be doing parent training and have my tech involved in 97156. There could be supervision wrapped up in H0031, in treatment planning, in overall communication across team members. There are also ways in which I’m doing supervision that’s indirect and non-billable: softscale training, crisis management training, and basic RBT training to make sure staff have met their competency assessments. These are not billable services, but they’re still part of supervision. How we define supervision isn’t clear, and that’s extremely problematic.”
A second objection addressed the timeframe. ABA services are authorized in six-month periods, and supervision ratios fluctuate predictably across those periods: a child beginning treatment typically requires higher LABA involvement early in an authorization cycle, with direct technician hours ramping up as protocols are established. A calendar-year analysis crossing authorization periods will capture these natural fluctuations as apparent non-compliance. A coalition letter from MPAAQ, MassABA, and BABAT (Massachusetts Professionals in Behavior Analysis) offered a direct illustration: a provider authorized to deliver an average of fifteen percent 97155 across a six-month period might appropriately deliver supervision above twenty percent in the first weeks and below ten percent later. On an authorized basis, the ratio might comply. Measured against January through December of a calendar year, it might not.
A third gap emerged from a common workforce-management practice. When a credentialed supervisor departs or goes on leave, a provider will often place a licensed BCBA who is still awaiting payer credentialing to cover the case and maintain the child’s hours. That clinician holds a valid BCBA credential. But because payer credentialing is not yet complete, their supervision hours do not count toward the 10 percent threshold, even though they are a licensed behavior analyst performing clinical supervision. Gregory Paquette, M.S., BCBA, Chief Operating Officer at Boston Behavior Learning Centers, described the problem directly: “That clinician is licensed. They’re a BCBA. They’re just waiting a long time to get credentialed. So we place them to help the child and meet the hours, and those numbers don’t necessarily count toward the 10 percent.” According to the BACB’s annual data report, the first-time BCBA exam pass rate has fallen from a peak of 66 percent in 2020 to 51 percent in 2025, the lowest rate the credentialing board has recorded, meaning providers must now plan for the possibility that roughly half of their candidates in any given exam cycle will not pass.
One dimension of the Carelon notice created confusion: the MPAAQ coalition letter described it as specifying full recoupment where supervision exceeded 20 percent of direct service hours, suggesting providers could be penalized for supervising too much as well as too little. MPAAQ has since confirmed that no above-20-percent recoupments occurred. The reference in the coalition letter reflected an error: a provider appears to have misread the audit’s “over 20:1” ratio threshold (which corresponds to below five percent supervision) as a separate penalty for supervising above 20 percent. MPAAQ has acknowledged the error in the coalition letter.
Three additional gaps skewed the ratio in the same direction. First, the calculation used only paid units: when a 97155 claim was denied for administrative reasons, those supervision hours vanished from the numerator, depressing the ratio regardless of how much supervision was actually delivered. Second, the audit did not distinguish between 97153 services rendered by a behavior technician and those rendered directly by a LABA; when a behavior analyst steps in during a staffing shortage, those hours bill under 97153 and are classified as unsupervised technician time. They are not. Third, for members covered by both private insurance and MassHealth, providers typically bill supervision to the primary insurer first; those units would not appear in MassHealth-paid data, artificially depressing the 97155 numerator.
The most notable institutional critique came from outside the provider community. Point32Health, parent company of Tufts Health Plan, submitted a formal dispute to MassHealth on February 9, 2026, weeks before most providers had seen a recoupment letter. The company had received MassHealth’s overpayment notification the previous November. Its letter described the CY2024 audit methodology as potentially flawed, noted that H0031-U2 should have been counted as a valid supervision code, observed that the relevant regulation at 130 CMR 358.00 does not clearly define supervision requirements, and concluded that MassHealth had never communicated to health plans or providers that only 97155 could document LABA supervision of behavior technicians. Point32Health also flagged a structural concern: the requirement that health plans absorb 100 percent of unrecovered overpayment amounts from their capitation, combined with an ABA-specific risk corridor settlement for 2024, raised the prospect that health plans could be penalized twice for the same overpayment.
The legal challenge articulated by Krokidas & Bluestein pressed these arguments into statutory territory. Under M.G.L. c. 118E, §38A(c), retroactive claims denial after twelve months is permitted only under specific circumstances, among them fraud, non-delivery of services, and non-compliance with MassHealth regulations. ABA performance specifications are not regulations: a characterization the Massachusetts Office of the Inspector General endorsed in its 2024 Annual Report, which described them as “expectations imposed on entities that contract to provide specific ABA services.” The attorneys also noted that the 2026 performance specifications, newly issued, specify that supervision ratios are to be measured on a monthly basis: an explicit standard conspicuously absent from the 2024 edition. The broader pattern of payers applying billing code restrictions that were never formally codified as payment conditions has been documented across multiple states, but MassHealth’s approach stands out for applying the standard retroactively to a full year of already-paid claims.
What the MassHealth ABA Recoupment Means for Provider Viability, Access to Autism Care, and What a Better Regulatory Approach Would Look Like
Behind the legal arguments are children on long waitlists whose access to care depends on the continued viability of ABA providers — organizations that already operate on thin margins. Dr. Maria McClain, representing MassABA before the Joint Committee on Health Care Financing, testified that Massachusetts reimburses approximately $65 per hour for direct ABA services, compared to $88 in Arizona and $83 in Maryland. For smaller practices, the consequences of an unbudgeted recoupment could be terminal. “Worst case scenario,” said Melanie Giles, whose clinic serves roughly ten ABA clients alongside a larger speech therapy caseload, “is that it could potentially close a clinic like myself.” Kate Goslin, owner and CEO of Sunflower Development Center, said expansion is on hold: “Expanding to serve more families right now is a difficult decision because we need to ensure we remain financially stable.” As an indicator of scale, Gregory Paquette of Boston Behavior Learning Centers noted that nearly 100 organizations joined a trade organization call to learn more about the audit and coordinate next steps.
Massachusetts has already mandated a more accurate path forward. The vendor contract requires ABA providers to obtain accreditation through nationally recognized bodies by January 1, 2027 for center-based providers and January 1, 2028 for all others. Accreditation through bodies like the Autism Commission on Quality (ACQ) involves direct evaluation of supervision practices, treatment planning, and staff competency — the very dimensions the 2024 audit tried to measure through a billing ratio proxy. CASP’s March 10 letter to MassHealth argued explicitly that this accreditation framework should serve as the primary quality mechanism rather than retrospective claims analysis, a position MPAAQ echoed in coordinating the provider response. “If fraud is the target,” Giles said, “approach it more like the ACQ accreditation. There’s a stark contrast: one of them causes much more damage and doesn’t stamp out fraud. It just creates problems for the good providers.” As Acuity has reported in its coverage of the broader accountability era taking shape in autism care, accreditation-first frameworks are increasingly the preferred mechanism for quality oversight because they assess actual clinical practice rather than billing proxies.
As of this writing, MassHealth has not responded publicly to the demands filed by Krokidas & Bluestein. The April 2 response deadline has passed. In the days following, MPAAQ received a response to its March 13 coalition letter from a legislative liaison in the Secretary’s office, who indicated that the office is in contact with MassHealth and aware of the issue. No timeline for a meeting with providers has been established; the Secretary’s office indicated it would first meet with the health plans before scheduling engagement with the provider community.
