A former technical services manager for a US community health care organisation faces up to 10 years in prison after being convicted of hacking into his former organisation's computers and sabotaging patient data.
Jon Paul Oson could also be fined up to $500,000 (£250,000) at his sentencing in November, the FBI said.
Oson was arrested in August 2006 on charges of damaging computers belonging to the organisation, which provides services to 17 health clinics.
Oson accessed the computers two months after resigning because of what he perceived to be a negative performance evaluation, the FBI said.
He was accused of deleting software and data, including bills, appointment schedules, case histories, diagnoses and treatment plans.