Amazon DynamoDB, Amazon RDS (Oracle and MySQL engines only), and Amazon EMR now covered under the AWS Business Associate Agreement

You can use AWS to build applications that are compliant with the US Health Insurance Portability and Accountability Act (HIPAA), using services that are covered under the AWS Business Associate Agreement (BAA). The AWS BAA now covers three new services: Amazon RDS (relational databases; MySQL and Oracle engines only), Amazon DynamoDB (NoSQL database), and Amazon EMR (big data processing).

Source: Amazon Web Services News