Jason Pierre-Paul -- Hospital Launches 'Aggressive' Investigation ... Into Medical Records

The hospital where NFL star Jason Pierre-Paul is being treated for fireworks injuries says it's launching an "aggressive internal investigation" to find out if a staffer leaked JPP's private medical records to an ESPN reporter.

The supposed medical records were posted by ESPN's Adam Schefter on Wednesday -- showing JPP underwent a procedure to have a finger amputated.

Now, Carlos A. Migoya -- president and CEO of Jackson Health System -- says he's determined to find out if the documents were leaked by a hospital employee ... violating patient confidentiality.

"Late Wednesday, media reports surfaced purportedly showing a Jackson Memorial Hospital patient’s protected health information, suggesting it was leaked by an employee. An aggressive internal investigation looking into these allegations is underway."

Migoya adds, "If these allegations prove to be true, I know the entire Jackson family will share my anguish."

"If we confirm Jackson employees or physicians violated a patient’s legal right to privacy, they will be held accountable, up to and including possible termination. We do not tolerate violations of this kind."