The Centers for Medicare & Medicaid Services has picked Serco Inc. to run one of the federal government's most consequential payment-integrity engines, awarding the company a seven-year contract worth roughly $109 million to serve as the review contractor for the Comprehensive Error Rate Testing (CERT) program. The award, announced June 29, 2026, hands Serco responsibility for measuring how much Medicare pays out in error each year across a program that moves more than $1 trillion annually. Serco reportedly outlasted eight competitors to keep a franchise it has supported for over a decade.
Background
CERT is the yardstick CMS uses to calibrate the improper-payment rate for Medicare Fee-for-Service, the traditional program that covers roughly 70 million Americans and processes more than $1 trillion in medical expenditures each year. Rather than review every claim, the program draws a stratified random sample and subjects it to independent medical review, then extrapolates the results to estimate how much the wider program pays incorrectly. Those errors are not the same as fraud. They capture claims that lack sufficient documentation, use the wrong billing or coding, cover non-covered services, or otherwise fall outside Medicare's coverage rules. The resulting rate is reported by contractor, service and provider type, giving CMS a diagnostic map of where money leaks out of the system.
The measurement is not optional bookkeeping. Under the Payment Integrity Information Act of 2019, federal agencies must identify programs susceptible to significant improper payments, estimate the annual amount, and report the figures publicly. For Medicare Fee-for-Service, CERT is the mechanism that produces that legally required number. The review contractor sits at the center of the process, obtaining medical records from providers, applying Medicare's coverage, coding and billing policies, and defending the methodology that ultimately drives corrective-action plans across the program.
Key Details
Serco's contract carries a total value of about $109 million over seven years, with the company serving as the CERT Review Contractor. Under the award, Serco will deploy a team of independent medical reviewers to validate that sampled claims comply with Medicare coverage, coding and billing rules. What distinguishes this cycle is the technology layer. Serco said it will support that human review with intelligent document processing and advanced artificial intelligence to sort, extract and validate information from the medical records that flow through the program, aligning the effort with the Payment Integrity Information Act's mandate.
The work is performed both virtually and at Serco facilities in the Richmond, Virginia area. The company framed the award as an extension of more than 12 years supporting CMS payment-integrity work, and reported that it prevailed over eight competitors in the competition. That combination of an incumbent record and a large competitive field is notable in a market where CMS has increasingly pressed contractors to modernize claims review with automation while preserving the independent clinical judgment that gives the error rate its credibility.
The stakes for accuracy run in both directions. An error-rate methodology that overstates problems can trigger unwarranted recovery actions and provider burden, while one that understates them leaves recoverable dollars on the table and weakens the corrective-action loop the program is built to drive. That tension is why CMS treats the review contractor role as a specialized clinical-and-analytics function rather than a commodity back-office service, and why the introduction of AI-assisted document processing draws scrutiny. The models accelerate the handling of records, but the compliance determinations still rest on independent medical reviewers applying Medicare policy.
What It Means for Contractors
The Serco award is a clear signal about where CMS wants program-integrity work to go. The agency is not choosing between human reviewers and automation. It is buying both in the same package, and it is willing to pay for a vendor that can fuse independent clinical review with intelligent document processing at national scale. For firms competing in the health-IT and payment-integrity space, the takeaway is that AI capability is becoming table stakes for these recompetes, not a differentiator on its own. The differentiator is the ability to stand behind AI-assisted determinations with defensible clinical judgment and a methodology that survives audit and appeal.
The eight-competitor field also tells contractors something about the state of this niche. Payment-integrity contracts anchored in statutory requirements like the Payment Integrity Information Act are attractive precisely because the demand is durable. As long as Medicare Fee-for-Service moves north of a trillion dollars a year, CMS is legally obligated to measure the error rate, and the review-contractor role will be recompeted on a predictable cadence. That draws a crowded field, and it rewards incumbents who can point to a long operating record. Serco's 12-plus years supporting CMS clearly mattered here, a reminder that past performance on integrity work compounds into an advantage that is hard for challengers to overcome.
There is also a lesson in domain concentration. Richmond-area delivery, virtual review teams and a specialized medical-review workforce are not easy to spin up on short notice. Companies eyeing this market should be building the clinical-review bench, the document-processing pipeline and the compliance framework well before a solicitation drops, because the winning proposals in this space read as extensions of standing capability rather than promises to build one. For the broader civilian health market, the award reinforces a trend GovCon firms have watched for several cycles now. Federal health agencies are steadily folding machine learning and large-scale document automation into work that used to be almost entirely manual, and the vendors positioned to win are the ones that treat AI as an accelerant for expert human review rather than a replacement for it.
For Serco, the contract extends a program-integrity relationship with CMS that now stretches past a decade, and it locks in seven years of predictable work anchored to a statutory mandate. For everyone else, it is a template of what CMS will reward next time the CERT franchise or one of its siblings comes up for bid.
