GoKawiilHealthcare billing company Medical Computer Business Services (MCBS) has disclosed that a 2025 network breach exposed the sensitive information of more than 1.2 million people.
The security incident was disclosed late last month without any details about the number of potentially affected individuals. In a disclosure to the U.S. Department of Health and Human Services, the company reported that 1,261,464 people have been impacted.
MCBS is a regional private medical billing and practice-management company headquartered in Augusta, Georgia, that provides billing, coding, accounts receivable, financial, and administrative services to healthcare organizations.
The company acts as a healthcare data aggregator, processing patient records for healthcare providers.
In late June, MCBS published a notification on its website, informing that threat actors had gained unauthorized access to its network between September 22 and 26, 2025.
The company then conducted an investigation to determine the incident’s scope and impact, and completed it on May 28 this year, determining that the following data may have been exposed:
Full name
Physical address
Social Security number
Date of birth
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