Ambulance staff whose medical records were sold to solicitors will launch a class action against NSW Ambulance in the Supreme Court on Monday in an action that will test privacy law.

NSW Ambulance contractor Waqar Malik was convicted of unlawfully disclosing personal information last year after he sold the worker's compensation files of 130 former and current employees to personal injury lawyers.

NSW Ambulance paramedics are suing for breach of confidence and invasion of privacy after a contractor sold their medical records to a third party. Credit:Quentin Jones

The files included medical records such as psychiatric assessments and details of injuries.

Current and former ambulance employees who have joined the class action argue this sensitive information should have been more strictly managed, in a statement of claim that alleges breach of confidence, invasion of privacy, breach of contract and misleading and deceptive conduct.