Amazon Chime is now a HIPAA Eligible Service. If you have a HIPAA Business Associate Addendum (BAA) in place with AWS, you can now start using Amazon Chime for your HIPAA eligible workloads. If you do not have a BAA in place with AWS or have any other questions about running HIPAA-regulated workloads on AWS, please contact us.

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/chime_hipaa_eligibility/