Someone hacked the computers of a state - licensed provider of services to the developmentally disabled and stole Social Security numbers and medical information for about 9,700 clients , the organization and the state agency that oversees it said Monday . Frederick - based Service Coordination Inc. said it learned of the security breach in late October but did n't begin notifying affected individuals until Friday . Part of the delay came at the request of the U.S. Justice Department to allow for a federal investigation , the nonprofit organization said . Service Coordination said investigators have identified the alleged hacker and seized that person 's equipment and accounts . Justice Department spokesman Peter Carr in Washington said he could not comment on an ongoing investigation . Service Coordination said there 's been no evidence the information was misused or released . Spokesman Michael Baisey wrote in an email that the breach involved one document containing information for about 70 percent of the group 's 13,900 clients . He said his organization will assist clients and families in checking their credit reports and registering for a free year of identity theft protection . Service Coordination is one of five private organizations licensed by the state 's Developmental Disabilities Administration , an agency of the Maryland Department of Health and Mental Hygiene , to provide services , said Patrick Dooley , the administration 's acting director . Dooley said it was Service Coordination 's responsibility to assist people with credit checks and ID theft protection because it had the breach . " We want to make sure people get the help they need . We 'll be working with SCI to make sure people get the help they need , " Dooley said . ;