It is understood that the King's personal data was not compromised in the alleged data breach at the London clinic.
It has been reported that up to three people may have been involved in allegations of accessing the Princess of Wales' personal medical records after she was discharged from hospital on January 29.
Charles, who is undergoing treatment for a type of cancer, also spent three nights at a London clinic during the month receiving treatment following treatment for an enlarged prostate.
The King and Duchess Kate left the hospital separately on January 29, just hours apart.
The Pennsylvania Press understands that Charles' medical records were not accessed in the alleged breach.
The London Clinic vowed on Wednesday that “all appropriate investigative, regulatory and disciplinary action will be taken” for any violations.
“We have no place in our hospital for anyone who willfully violates the trust of our patients and colleagues,” London Clinic CEO Al Russell said in a statement.
Britain's privacy watchdog, the Information Commissioner's Office (ICO), is investigating an alleged breach of royal data at a private hospital where the Duchess of Cambridge underwent abdominal surgery, and is assessing information.
according to mirroran investigation was launched at the clinic where Kate spent 13 nights in January after staff attempted to access Kate's medical records.
The princess was admitted to a private hospital on January 16th for abdominal surgery.
Details of the Duchess's medical condition have not been disclosed, but Kensington Palace previously said it was not cancer-related and that the Duchess had preferred to keep private medical information private.
The Data Protection Act 2018 makes it a criminal offense to obtain, disclose or retain personal data without the consent of the data controller.
The ICO can carry out criminal investigations and prosecute individuals where it believes a crime may have been committed.
Violation reports are typically evaluated by our criminal investigation team and a decision is made as to whether to proceed in accordance with our regulatory action policy.
This decision includes considering whether there is sufficient evidence to support prosecution and whether it is in the public interest to do so.
Kate also has the option of filing a private civil suit and possibly seeking damages.
Police have investigative powers and will usually prosecute under data protection laws if other crimes are being prosecuted at the same time.
Health Minister Maria Caulfield said police had been “asked to investigate” whether staff at the clinic had attempted to access the princess's medical records.
He said accessing the notes without permission could have “significant repercussions” including prosecution and fines.
Ms Caulfield said she understood police had been contacted, but a Metropolitan Police spokeswoman said she was not aware of any referrals.