Double Billing Isn’t a Clerical Error. It’s a Strategic Exploit.

The recent guilty plea of a Washington, D.C.–based healthcare worker for billing over $100,000 in unrendered services reveals a pattern that compliance professionals can no longer afford to treat as clerical oversight. Double billing in Medicaid is not just an administrative misstep, it’s a repeatable fraud tactic that thrives when verification systems assume good faith and overlook practical constraints on human behavior.

On July 15, federal prosecutors announced that Amstrong Chapajong, a personal care aide (PCA) and community support worker (CSW), admitted to defrauding the District of Columbia Medicaid program over a 22-month span. By submitting false timesheets, Chapajong claimed to provide in-person support for activities of daily living and simultaneous telephonic behavioral health services to multiple patients at once, despite being physically unable to perform both roles concurrently. This scheme led to a confirmed loss of more than $113,000 in taxpayer funds.

Though the dollar figure is modest compared to higher-profile Medicare or pharmacy fraud cases, the operational lessons are significant. This case shows how common role-stacking practices in home and community-based services (HCBS) can become vectors for fraud when oversight systems are unable, or unwilling, to cross-reference basic temporal and geographic realities.

The Invisible Gap Between Paper and Presence

PCA and CSW roles are critical to Medicaid beneficiaries, particularly those with physical disabilities or behavioral health needs who rely on these services for continuity and independence. But they also present challenges for verification. Unlike services delivered in facilities or clinics, in-home and telephonic care rely heavily on self-reporting by the provider.

According to a 2023 report from the Office of Inspector General (OIG), one of the most persistent vulnerabilities in Medicaid-funded home-based services is the reliance on paper timesheets or manual logging systems that lack real-time geolocation or biometric verification. In the Chapajong case, the fraud scheme exploited precisely this blind spot, documenting services in parallel across distinct locations and care modalities that could not have occurred simultaneously.

The mismatch between logged services and physical feasibility should have been a red flag. Yet the claims proceeded through the system without triggering alerts, highlighting a weakness in payer-side analytics and employer-level supervision. A 2024 GAO audit of state Medicaid program integrity initiatives noted that only 19 states had implemented electronic visit verification (EVV) for personal care services in a way that enabled time/location cross-checks across multiple provider roles.

Overlapping Shifts, Underlapping Oversight

One operational feature that made this fraud possible was Chapajong’s dual employment across multiple employers and care settings. This is not uncommon in HCBS sectors, where low wages and staffing shortages push workers to cobble together hours across agencies and service types.

However, without shared credential tracking and shift coordination across employers, providers are free to submit overlapping claims that appear valid within each siloed system. A 2024 Health Affairs article underscored the need for Medicaid plans to develop cross-agency flagging mechanisms that detect “implausible care stacking,” scenarios in which a single worker submits simultaneous claims for distinct services across patients or locations.

Chapajong’s false claims were only identified after the D.C. Department of Health Care Finance’s Division of Program Integrity referred the case for investigation. By that point, the duplicative billing had persisted for nearly two years.

EVV Isn’t a Silver Bullet But It’s a Start

The 21st Century Cures Act mandates that states implement electronic visit verification systems for Medicaid-funded home care, but compliance remains uneven. As of 2025, not all jurisdictions have fully integrated EVV for all personal care services, and behavioral health services often fall outside these frameworks altogether.

In the Chapajong case, even a basic EVV system requiring geolocation and time-stamped check-ins would have quickly revealed discrepancies in his timesheets. More advanced systems, such as biometric verification or app-based provider tracking, are available but often underutilized due to cost, provider resistance, or implementation complexity.

According to the Centers for Medicare & Medicaid Services (CMS), the goal of EVV is not merely to catch bad actors but to verify service delivery for vulnerable populations. Yet without enforcement mechanisms that cross-reference roles, locations, and provider identities, even the best tools become passive archives rather than active compliance engines.

Small Fraud, Big Implications

Some may view a $113,000 fraud as minor in the scale of federal health program losses. But the Chapajong case represents a broader issue that scales rapidly. When double billing goes undetected across even a small fraction of HCBS providers, aggregate losses can balloon. More importantly, the reputational and systemic damage erodes public trust in programs designed to support the most vulnerable.

For healthcare executives, particularly those overseeing Medicaid MCOs, behavioral health organizations, and home-based service contractors, this case is a reminder that compliance is not just a documentation function—it’s a structural imperative. Preventing fraud requires more than retroactive audits. It requires interagency data-sharing, real-time verification systems, and governance frameworks that assume every claim must be plausibly executable within the constraints of time, geography, and human capacity.

Recalibrating Oversight for the Realities of Home-Based Care

Chapajong will face sentencing in early 2026 and has agreed to pay full restitution. But for compliance and program integrity leaders, the takeaway should not be limited to financial recovery. Instead, this case invites a broader recalibration of how the healthcare system monitors care models that operate outside traditional facilities.

Verifying the presence of a provider may seem rudimentary, but it remains one of the hardest challenges in home and community-based services. As fraudsters evolve to exploit credential gaps, timecard duplications, and claim-splitting across employers, oversight models must evolve in kind.

Double billing is not a clerical accident. It’s a strategic exploit made possible by fragmented systems that mistake paperwork for proof. Rebuilding trust in Medicaid-funded care requires tools, policies, and coordination mechanisms that verify the reality behind every reimbursed hour. Until then, the risk remains not just financial, but structural.