The open source release of mattermost has a lot of underutilized potential in the healthcare industry.
As long as the decision makers know something is available and actually provides value (and the decision makers are not stubborn and set in their ways for decades), it will be implemented.
Caveat - people writing most medical/billing software don't have any incentive to release it as FOSS and they have more money for promotion than any FOSS project.
Bribery is very common in large software sales.
So one cannot use e.g. slack channels to shout to everyone about some problem. The usage pattern should be closer to email or an issue tracker with only involved doctors and nurses added to each patient or case. Email is of course unsuitable because of how easily information can slip out unprotected.
Unfortunately, doctors are people like the rest of us, use whatsapp and facebook to ask thousands of colleagues for help with their patients. Totally against the law.