The Mater Hospital complied with its legal requirement to report coronavirus cases to the public health authorities, HSE boss Paul Reid has said.
A HSE investigation was launched after 244 cases were added to the Department of Health's daily announcement of new coronavirus cases on Thursday.
The cases dated back to mid-March.
The Mater insisted it had reported all cases of Covid-19 to the authorities every day.
Now a draft report into the issue has found the Mater did comply with its obligations but there were "data uploading issues" that led to the discrepancy.
Mr Reid said he was concerned by the delay in adding the cases to the total number of people who are confirmed to have contracted Covid-19.
He asked for a review of what happened and he said that facts in the draft report have reassured him.
Mr Reid said the findings of the probe "clearly demonstrates" the legal requirement for the Mater to report coronavirus cases was met. He also said contact tracing was completed in the 244 cases.
Mr Reid said the issue arose because information submitted to the labs "at some stage in the process" did not have full details, particularly all of the names involved in the cases.
"Therefore it didn't allow us the complete correlation of the data at the appropriate time," he said.
Mr Reid said he has asked HSE chief clinical officer Dr Colm Henry to seek assurances from all hospitals that the data is being submitted to the labs with all the required details.
"The report will make very clear recommendations in this regard," he said.
Mr Henry stressed the report was a draft but that it appears the lab was unable to upload all of the information onto the system collating coronavirus cases as the details of the cases were incomplete.
He said that the Mater did report the full information to the Public Health Department of Ireland East Hospital Group which allowed for assessment of the cases and contact tracing to take place.
Mr Reid said "due process" must be completed in relation to the HSE investigation into what happened with the data from the Mater and it is expected that the final report will be finished shortly.
Meanwhile, members of the Dail probe into the State's coronavirus response have insisted their meetings will be carried out in strict adherence to public health advice.
It comes after former HSE boss Tony O'Brien claimed holding sessions with the three most senior health officials in the country on the same day is "cavalier" as it puts them at risk of contracting the virus.
Chief medical officer Tony Holohan, HSE chief executive Paul Reid, and Department of Health secretary general Jim Breslin are all due to appear before the Dail's Covid-19 response committee tomorrow.
It will be the first time TDs have the opportunity to quiz the officials at the forefront of Ireland's response to the coronavirus crisis in public.
KELLIE PACKS A PUNCH IN HOSPITAL
Boxer Kellie Harrington yesterday entertained hospital workers, shadow boxing to Queen’s We Will Rock You and Eye Of The Tiger by Survivor.
Harrington, a double world medallist – who had been hoping to take part in the Tokyo Olympic Games this summer – works at St Vincent’s Hospital, Fairview while still doing her country proud in the ring.
Despite the disappointment of the postponement of the tournament, and the challenges of working on the frontline, Harrington cheered the spirits of staff and fans.
The proud Dubliner shadow boxed at a furious pace as hospital staff banged tables to the beat of We Will Rock You and Eye Of The Tiger.
Harrington tweeted: “Entertaining the troops. Getting a few supported rounds in before lunch.”
People have been posting boxing challenge photos and videos on social media across the world.