The UK Statistics Authority has written to Richard Pengelly, the Department of Health's permanent secretary, noting the "serious public concern" over the reporting of Covid-19 statistics in Northern Ireland.
Over the last two weeks, there have been several changes to how coronavirus figures, including deaths and the number of tests carried out, have been reported.
On April 19, to DoH released a coronavirus dashboard to display daily statistics, replacing the daily surveillance reports released by the Public Health Agency.
In a letter to Richard Pengelly, Ed Humpherson, director general for regulation at the UK Statistics Authority, said: "This dashboard was suspended two days later on the grounds that a figure in it was incorrect, with limited explanation of the nature of the error."
Since the dashboard was suspended, the DoH has been releasing "less complete" daily statistics through their website and social media, Mr Humpherson said.
He said it is clear the DoH wants to address these issues and published comprehensive figures, which are of "huge public interest", "once you are assured of the quality of the data".
In order to do so, Mr Humpherson advised Mr Pengelly of four guidelines to assist in this process.
Mr Humpherson concluded his letter by stating: "The advice of the Senior Statistician within the Department should always be sought in matters relating to statistics and data, and they should have sole authority for deciding the methods, standards and procedures and the content and timing of the release of official statistics.
"I know there is serious public concern about the changes that have been made to the COVID-19 statistics and I look forward to your reply. I would be happy to discuss."