The new wearable further cements the iPhone maker's dominance in the smart wearables space.
Researchers used data from 14,000 Apple Watch users and was able to detect that 462 of them had diabetes by using the Watch's heart rate sensor.
The ResearchKit-based study launches in partnership with Stanford to identify irregular heart rhythms.
The company has also introduced the SmartRhythm feature that continuously monitors heart rate from the Apple Watch.
The iPhone maker has also announced the Apple Heart Study to identify irregular heart rates, including potentially serious heart conditions such as Afib.
The insurer, which covers 23 million, is already offering Apple's smartwatch to its 50,000 employees as part of its corporate wellness program.
Most significantly, the watch can now directly communicate with other devices without iPhone serving as an intermediary.
The app now enables Humana members to get reminders to refill prescriptions and track their prescription orders with a few taps on their wrist.
Based on Smartmedical's vocal emotion recognition technology, the app identifies and tracks users' emotions by analyzing multiple vocal properties.
The application would enable doctors to receive alerts, such as test results, on their wrists and, presumingly, be able to respond accordingly.