Valley Children's Medical Group officials say Connexin Software, a company that works with electronic medical records, confirmed the incident.
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Connexin officials say around 65,000 people may be impacted.
The breach happened in late August, but Valley Children's says they did not know about it until December 19. Their relationship with Connexin ended last October.
Officials are asking former patients and families with Fresno Children's Pediatrics, Sky Park Pediatrics and Dakota Pediatrics, Magnolia Pediatrics, Olivewood Pediatrics and Greenfield Pediatrics to be on the lookout for a letter from Connexin.
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Families can also call 855-532-0912 for more information.
The following information may have been released: