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The data watchdog is assessing a report that staff at the hospital where the Princess of Wales underwent surgery tried to view her private health information.
the claimed the Daily Mirror Staff at the London clinic, which is frequently used by members of the royal family, tried to access her private medical reports.
The Information Commissioner's Office (ICO) confirmed it had received a “breach report” and was investigating.
BBC News has contacted the London clinic for comment.
According to the Mirror, “at least one member of staff was said to have been arrested while trying to access” the princess’s medical notes.
The newspaper said that an internal investigation had been opened at the private London hospital, which treated both the Princess of Wales and King Charles III in recent months.
Asked about the Mirror story, an ICO spokesperson said: “We can confirm that we have received a report of the breach and are assessing the information provided.”
The ICO oversees the use of data protection and freedom of information regulations across the UK.
the official Guidance from the ICO is that organizations must report personal data breaches within 72 hours from the time they are discovered, if there is a “substantial risk” that they will have a “significant adverse impact” on individuals’ rights and freedoms.
Examples of high-risk violations include those that result in discrimination, loss of reputation, or loss of confidentiality.
BBC News was unable to independently verify the Mirror's claims, which were published late on Tuesday.
A Kensington Palace spokesman declined to confirm or deny the report, adding: “This is a matter for the London Clinic.”
The princess spent nearly two weeks in a London clinic, and Kensington Palace had previously said she would recover until after Easter.
On Monday, The Sun newspaper published a photo of Prince William and Catherine shopping in Windsor, their first public outing since Christmas.