Health insurance provider Medibank hit by 'cyber incident'

Medibank is the latest Australian company to be hit by a "cyber incident" but has reassured customers their personal data remains safe.

The health insurance provider announced today that it had detected "unusual activity" on the network yesterday.

"Medibank took immediate steps to contain the incident and engaged specialised cyber security firms," Medibank said in a statement.

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Medibank said it is isolating and removing access to some customer-facing systems to prevent any damage or data exposure.

The provider reassured customers that no sensitive data had been accessed.

Medibank said AHM and international student policy management systems have been taken offline and are expected to be down most of the day.

This means AHM and international student customers won't be able to access their policy information.

"I apologise and acknowledge that in the current environment this news may make people concerned," CEO David Koczkar said.

"We recognise the significant responsibility we have to the people who rely on us to look after their health and wellbeing and whose data we hold.

"We are working around the clock to understand the full nature of the incident, and any additional impact this incident may have on our customers, our people and our broader ecosystem."

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Medibank said customers don't need to do anything but can contact customer services if they have any questions.

The provider is investigating the incident and said it will provide regular updates to customers.

The incident comes just weeks after the major Optus hack which exposed at least 2.1 million personal identification numbers.

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