Skype for Business Future ?

David Kamp 

1. You don't have to create Teams, you can just use it for chat and meetings.

2. All files are either stored in OneDrive or SharePoint, so whatever policies you have set there are applied. For example you might use a DLP policy to prevent people sharing documents with patient information.

3. We can also now apply DLP to chat messages as well, limiting key phrases and comments as appropriate.

4. Services like Microsoft Information Protection allow you to label and encrypt documents, ensuring only authorised people can view the patient data.

LOTS of Healthcare organisations use Teams, there's a whole forum here dedicated to them here. You'll find a wealth of information including features that are being built specifically for them such as priority notifications (crash calls), support for medical image formats, annotations on images, team templates and a full FHIR integration for patient records. MichaelGannotti leads that function and might be able to point you in the right direction.