Chelmsford, Massachusetts-based Zoll — an Asahi Kasei company — characterized the incident as a “sophisticated email phishing attack” that targeted a Zoll employee.

Phishing attacks use seemingly trustworthy communications via emails, text messages or even phone calls to get the recipient to share security information such as passwords or to open a malicious hyperlink or attachment.

“This incident was limited to emails and had no impact on Zoll’s medical devices, software, or services,” the company said in a news release. “The PHI affected by the incident varied by individual and may have included some individuals’ names, addresses, Social Security numbers, and protected health information and/or health insurance information.”

Zoll said it has no indication that the information has been misused, but that it will notify affected individuals by mail and offer free credit monitoring and identity theft protection services. A dedicated call center for the incident at 800-459-4255 is open from 8 a.m. to 8 p.m. Central time on weekdays, except for major U.S. holidays