AWS provides several Landing Zone Accelerator configurations that support specific industries, including healthcare. The Landing Zone Accelerator for Healthcare is used in conjunction with AWS Control Tower to ease the management and governance of a multi-account environment that is aligned with AWS best practices and multiple global compliance frameworks. One important aspect of orchestrating governance is to group AWS accounts together by using organizational units (OUs), so you can administer them as a single unit.
https://docs.aws.amazon.com/prescriptive-guidance/latest/ou-structure-landing-zone/introduction.html
