The Pentagon is expected Wednesday to award a multibillion-dollar contract to modernize its health-records system, the biggest federal information-technology project since the troubled rollout of the HealthCare.gov insurance exchange in 2013.

Three industry teams are competing for the highly coveted project that is expected to take several years to transfer records of 9.6 million military personnel from a fragmented patchwork that still includes paper files to a single electronic system. Pentagon officials have said the system will be more easily available to health-care providers, and with added cybersecurity protection.

The Defense Department has opted to adapt a system from one of the big commercial health IT providers in an effort to keep the revamp affordable, though the move has attracted criticism from some observers concerned that it could soon be outdated and expensive to maintain.

The Pentagon earlier this year selected three industry teams led by some of the largest commercial health-records managers ahead of the initial contract award that is part of an 18-year project expected to cost around $11 billion.

Closely held Epic Systems Corp. has joined International Business Machines Corp., while Allscripts Healthcare Solutions Inc. has teamed with Computer Sciences Corp. and Cerner Corp. with Leidos Holdings Inc.

"This is really not an IT project, it's a business transformation project," Dave Bowen, chief information officer for Pentagon's Military Health System said in an interview earlier this year.

The Military Health System budget funds Pentagon-run hospitals and clinics, a medical school and external medical support for 9.6 million beneficiaries, including about 1.3 million active-duty service members.

Health care accounts for around 10% of the Pentagon's total budget compared with 6% in 2000, and costs have more than doubled over that period, according to the Congressional Budget Office.

Alongside improved patient benefits, the new records system is expected to provide more insight and oversight of medical spending, with more than half of treatments for service members carried outside Defense Department-run facilities.

"We can drive standardization and look at operating metrics," said Mr. Bowen, with the centralization of spending on health IT helping to avoid what he referred to as "pet projects," noting that maintaining the aging existing record system was eating up the majority of its IT budget.

The Pentagon said it would announce the winning bidder later Wednesday, and officials said it was due to be tested at a number of locations in the Pacific Northwest before being rolled out across the broader health network.

The bidders declined to comment ahead of the announcement.

Mr. Bowen said choosing the vendor was just the first step, with the biggest challenge being how it managed the data.

However, the Pentagon's decision to opt for the enterprise software approach used by big private hospitals to manage health records has come under fire from critics who said it should have pushed for a more innovative, cloud-based approach.

"If the Defense Department remains on its current path, it will end up spending continuously on upgrades needed to keep its health records abreast of changes happening elsewhere," said Loren Thompson at the Lexington Institute, a think tank part-funded by big defense companies, in a recent policy paper.

Write to Doug Cameron at doug.cameron@wsj.com

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