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Froedtert Health disclosed that a security breach at a contractor resulted in some patient information being stolen. (Photo: Getty Images)

Froedtert Health said that some patient information may have been stolen in a security breach at one of its contractors.

The compromised information did not include Social Security numbers, identification numbers for health insurance or credit card and other financial information, according to a news release from Froedtert Health.

Froedtert & the Medical College of Wisconsin Community Physicians Inc. — the physician group of Froedtert Health and the Medical College — is sending letters to some of its patients about the incident.

Froedtert Health said 3,074 patients were affected.

The stolen data may include patient names, addresses, provider names, dates of patient visits and, in some instances, medical record numbers and dates of birth. 

The incident occurred at Blackbaud Inc., which provides software and services used for fundraising and