The three-year-old was found dead in Decoy Pond in Brantham after he left a play area in Marriam Close.
An inquest into his death opened on Friday and was told he had left the play area through a gap in the fence and became separated from the relative who was with him.
Around 1,300 volunteers joined the search to find Noah.
Tributes were left at the playground (Image: Newsquest)
On Sunday, East Suffolk and North Essex NHS Foundation Trust announced it has launched an urgent investigation into the unauthorised access of patient data.
It is understood 10 employees have been removed from active duty while investigations are carried out.
Dr Marin Mansfield, deputy chief medical officer, said: “Any unauthorised access of patient data is completely unacceptable.
“We understand the significant distress it can cause patients and their families.
“It also undermines trust in our services. Safeguarding that trust is central to the care we provide.
“We have apologised unreservedly to Noah Woods’ family for the extra anguish this breach of trust has caused them at an already devastating time.”
The investigation was launched after the trust became aware that Noah Woods’ medical records may have been viewed “inappropriately.”
Immediate steps were taken to secure the records and prevent further illegitimate access.
The incident has also been reported to the Information Commissioners Office.
Dr Mansfield added: “We take any patient data breach seriously.
“We investigate thoroughly, and we will take disciplinary action where needed in response to our findings, in line with the Trust’s policies and procedures.”