By Elizabeth Dwoskin 

An unlikely set of partners teamed up to capitalize on a gathering flood of health-related personal information.

International Business Machines Corp. unveiled on Monday a partnership with Apple Inc., Johnson & Johnson and Medtronic Inc., as well as the acquisition of two medical-data software companies. Known as Watson Health, the effort transfers IBM's experience in data processing to the sensitive field of health care, part of an evolving strategy to pool and analyze data from other companies, such as Twitter Inc. and the Weather Channel. It will attempt to leverage the tech company's analytics and health-care software businesses into a new generation of apps for patients and providers.

The project reflects a growing view among technology vendors and medical providers that patient information that could yield valuable insights--and business opportunities--is locked up in proprietary silos. Such insights are increasingly valuable as the payment approach in health care shifts toward rewarding favorable health outcomes rather than services rendered. Watson Health would marshal huge amounts of scrambled and aggregated patient data in the service of providing individualized health care that might improve outcomes and cut costs.

Johnson & Johnson and Medtronic will share revenue with IBM from any apps sold. Apple will receive a cut of revenue through its App Store.

Similar big-data efforts under way in health care include Optum Labs, a collaboration between UnitedHealth Group and the Mayo Clinic, in which researchers mine clinical and insurance data in search of micro-patterns that give clues to early indicators of disease and help to tailor treatments. Precision Medicine, an initiative announced by President Barack Obama earlier this year, will combine genetic data with information from fitness trackers.

"The question is how does the medical system move away from broad categories to customized guidance," said Robert Wachter, associate chairman of the Department of Medicine at the University of California and author of "The Digital Doctor: Hope, Hype, and Harm at the Dawn of Medicine's Computer Age." Apps produced by Watson Health, he said, could enable a physician to develop a treatment course for a specific patient based on the genetic makeup and fitness levels of large numbers of similar patients. Results for consumers, though, are likely to be years away.

IBM's Watson data-mining technology has delivered impressive results, famously winning at Jeopardy in 2011, but the path to revenue has been slow. Turning data into actionable insights is a tremendous challenge, and health-care data poses greater difficulties, from accuracy to scientific value. Similar projects have been very slow-going with sparse results. "The signal-to-noise problems are humongous in health care," Dr. Wachter said. "People who think this will be as quick as Amazon shopping recommendations don't get the massive complexity."

All Watson Health partners will contribute data to the pool, subject to competitive considerations. Data will come only from patients who have consented to share their information and will be scrubbed of personally identifying features.

Apple will supply fitness, nutrition, heart-rate and other such information uploaded to some apps running on iPhones and iPads. In return, the Cupertino, Calif., company will gain greater penetration into the health-care sector through provider-focused apps built by IBM and sold to hospitals and clinics.

Johnson & Johnson and Medtronic will contribute data from devices for patients with diabetes and recovering from surgery. Those companies will gain tighter relationships with customers through patient-focused apps.

IBM will add to the data trove through Explorys and Phytel, two acquisitions that hold clinical information about more than 50 million patients. It will store and analyze the data in a so-called health cloud of computers, a network engineered to comply with health privacy laws. The network will encrypt sensitive data to thwart hackers.

IBM will work with Johnson & Johnson and Medtronic to develop health apps for patients, to be sold through medical providers. For example, a patient who recently underwent a joint replacement and wore a J&J device could download a personal health coaching app. The app could provide personalized guidance between rehab visits and report to the provider on patient progress, said Sandra Peterson, J&J's Group Worldwide Chairman.

IBM will also build a suite of enterprise wellness apps, the company said. IBM has a large foothold in large health-care companies. The company sells products or does business with 89 of the world's top 100 health-care organizations, it said.

"The health-care system is highly fragmented with very little sharing of information, and outcomes are not acceptable and the cost is completely unacceptable," said IBM Senior Vice President John Kelly. "As we see health care becoming more information-based, we see a role for IBM to step in."

Dr. Wachter said IBM was well positioned to provide such apps because it appeared to be relatively neutral compared with medical records or insurance companies that might pool similar data.

Write to Elizabeth Dwoskin at elizabeth.dwoskin@wsj.com

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