Aug 14 (Reuters) - The cyberattack at UnitedHealth

Group's ( UNH ) tech unit last year impacted 192.7 million

people, the U.S. health department's website showed on Thursday.

In January, the company had estimated the hack at Change

Healthcare affected the personal information of 190 million

people.

The cyberattack - the largest healthcare data breach in the

United States to date - was disclosed in February last year. The

unit was infiltrated by hackers who identified themselves as the

"Blackcat" ransomware group, causing widespread disruptions in

claims processing and impacting patients and providers across

the country.

The number of impacted people was posted on a list of data

breaches maintained by the U.S. Department of Health and Human

Services' office for civil rights.

UnitedHealth ( UNH ) did not immediately respond to a Reuters

request for comment.

Information made vulnerable in the UnitedHealth ( UNH ) attack is

believed to include health insurance member IDs, patient

diagnoses, treatment information and social security numbers, as

well as billing codes used by providers.