*[https://www.stratusmedicine.com/ Stratus Medicine]
*[https://www.availity.com/products/developers/apis]: $200M+. PE-backed.
*[https://www.diameterhealth.com/solutions/ Diameter Health]: $11M+ raised. Optum as lead investor. Platform for EHR data exchange and analysis.
*[http://www.moxehealth.com/ Moxe Health]: Not really an API play.. but an integration platform that aims to be sponsored by payers and create a bidirectional network between payer-providers. $6M+ Series A. In Wisconsin.