You don’t have to be an Anthem Insurance customer to have heard about their recent hack. Now, new revelations show that you don’t even have to be registered with Anthem to be affected.

The company’s own analysis indicates that about 78.8 million people could have been compromised in the February 4th attack. This number relates to the amount of people whose data could have been viewed by cyber-intruders, but not necessarily stolen.

Around 76-89% of the 78.8 million compromised accounts belong to current or former Anthem (known prior as Wellpoint, Inc.) subscribers, with the remainder held by non-members: Blue Cross Blue Shield customers who have claimed on insurance in the last decade in a state where Anthem operates.

This remainder comes to around 8.8 to 18.8 million people – quite a significant amount of non-Anthem customers who might have been affected by the attack.

On February 4th, 2015, hackers broke into a database at Anthem containing customer and employee records. These included names, addresses, phone numbers, email addresses and member IDs, though not financial or medical information, according to Anthem CEO, Joseph Swedish’s official statement.

Those affected will be personally contacted by the company, with letters being sent out next week. Free credit monitoring services, including two years of identity theft repair assistance and fraud detection, are being offered to compromised account holders.

Investigations continue as the company works with US state and federal law enforcement. It is believed that tens of millions of records have been stolen, and not simply viewed.

To date, BreachAlarm has not detected any public leaks of Anthem customer data, though we will continue to keep you updated should this situation change.