A landmark data breach complaint against private health insurer Medibank is gathering pace that could see compensation payouts for 9.7 million former and current customers.

Law firms Maurice Blackburn Lawyers, Bannister Law Class Actions and Centennial Lawyers have joined forces to run the legal action against Medibank.

The law firms have been investigating compensation claims and say they have registered tens of thousands of Medibank customers.

As one of Australia's biggest health insurance providers, Medibank holds information that includes intimate medical records
Three law firms have launched a landmark data breach complaint against private health insurer Medibank after personal data affecting 9.7 million people was hacked. (Adobe Stock)
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Australian authorities said hackers were behind the capture of millions of current and former Medibank customers during a cyber attack last October.

The sensitive personal data was released onto the dark web in stages.

In November, Maurice Blackburn launched a formal complaint against Medibank with the Office of the Australian Information Commissioner (OAIC), which has the power to order compensation.

Bannister Law Class Actions principal Charles Bannister said he hoped the co-operation agreement would lead quickly to compensation payments to the millions of Medibank customers whose data was breached.

“We believe the data breach is a betrayal of Medibank Private’s customers and a breach of the Privacy Act. Medibank has a duty to keep this kind of information confidential,” he said.

News Australia court gavel stock
The legal action could lead to compensation for up to 9.7 million current and former Medibank, AHM and international student customers. (Supplied)

Maurice Blackburn’s head of class actions Andrew Watson said the co-operation agreement was a significant development.

“This data breach has caused millions of Australians significant distress. The co-operation agreement ensures that all three law firms are working together for the common aim of obtaining compensation for those affected as quickly as possible.”

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Medibank has been contacted for comment.

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