Sutter Health reported that a desktop computer with personal information for 4.24 million patients was stolen in October. The computer stored names, addresses, dates of birth, phone numbers, e-mail addresses, medical-record numbers and insurance plan names for about 3.3 million patients of 22 Northern California providers contracted with Sutter Physician Services, which handles business and administrative services. The data for those patients spanned from 1995 to January 2011. The computer also held similar data for another 943,000 patients who sought care from the Sutter Medical Foundation from January 2005 to January 2011. Those records also included dates of services and descriptions of medical diagnoses and procedures used for business operations. Sutter said it will notify Sutter Medical Foundation patients by Dec. 5. A Sutter Health spokeswoman said the system is not planning to notify the 3.3 million patients directly. “Sutter Health holds the confidentiality and trust of our patients in the highest regard, and we deeply regret that this incident has occurred,” Sutter Health President and CEO Pat Fry said in the release. The computer was stolen during the weekend of Oct. 15-16 from Sutter Medical Foundation’s administrative offices in Sacramento, the system said. The data was password-protected but unencrypted, Sutter said, noting that its data security office was in the process of encrypting desktop computers.