The Apple Watch's usefulness for fitness tracking is obvious, but it's making a bit impact on medicine, too.

That's the word from Apple CEO Tim Cook, who talked a bit about the Apple Watch's impact during Apple's third-quarter 2015 conference call with analysts. Cook cited work being done at Nebraska Medicine, Ochsner Health System and Kings College Hospital as examples.

"...Doctors and researchers at leading hospitals in the U.S. and Europe are already putting Apple Watch to work in improving patients' lives," said Cook.

Nebraska Medicine has rolled out new intercommunication apps between doctors and patients, according to Cook, including apps that provide quick access to charts and patient dosage information.

Ochsner Health System, based just outside New Orleans, Louisiana, is also using the Apple Watch. That health care provider is working with patients suffering from hypertension (high blood pressure), to gather information about daily activity and blood pressure levels to help improve tracking.

Health work involving the Apple Watch is being done internationally, as well. Cook also cited work at King's College Hospital, an acute care facility in Denmark Hill, Camberwell, in London, England. King's College is using the Apple Watch for the care and monitoring of patients receiving cancer treatment.

"This is just the beginning of what this new platform can deliver," said Cook. "With Apple watchOS 2, developers now have the ability to build richer and more powerful native apps for Apple Watch, taking advantage of the heart rate sensor, the Digital Crown, accelerometer, and more, ushering in a whole new class of apps designed specifically for the wrist."

Serenity Caldwell contributed to this article.