Healthcare entities in the U.S. so far appear to have mostly avoided the crisis of WannaCry. Ransomware exploits flaw in Windows server message block, or SMB, functionality that was present in every Windows operating system from XP to Server 2008 R2. Microsoft quietly patched the flaw for currently supported operating systems in March, before the Shadow Brokers released a dump of “Equation Group” attack tools in April. New York-Presbyterian Hospital: “Upon learning of the attacks, we evaluated controls at all hospitals””]
Source: https://www.cuinfosecurity.com/wannacry-whats-impact-on-us-healthcare-a-9921