AWS is fine for building out HIPAA services. They have a decent portal at https://aws.amazon.com/compliance/hipaa-compliance/ explaining their compliance, which services you can use, and how to get them to sign a Business Associate Agreement (BAA).
I haven't done healthcare stuff in GCP or Azure so I can't compare, but AWS is _not_ a blocker for HIPAA.
I've heard that that page is outdated and instead if you sign into G Suite as an admin, go to the admin console (admin.google.com/ac/companyprofile/legal) and then go to "Security and Privacy Additional Terms" you can review sign a BAA.