The Information Commission planned to publish the codes, which outline employers' responsibilities when handling staff information under the Data Protection Act, before former commissioner Elizabeth France left in September.
But the monitoring and medical records codes have now been delayed until new commissioner Richard Thomas takes over on 2 December. Thomas is director of public policy at law firm Clifford Chance.
David Smith, assistant information commissioner, said that work on the 50-page monitoring code is largely complete, but Thomas needs to approve it before it is released.
"I hope that the monitoring code can be released before Christmas. The medical records code needs a further closed consultation with business, so it should be out by March next year," he said.
Codes covering recruitment and employee records have already been published.