The figures were released as it emerged the deficit faced by the HSE this year could be more than €1.1 billion.
The documents released to the Irish Examiner under the Freedom of Information Act show Prof Drumm’s "inner cabinet" were among the biggest winners from the massive pay-outs.
In the first six months of last year, the HSE paid €83,895 to Prof Drumm’s personal communications adviser Karl Anderson. Mr Anderson is paid a monthly rate of more than €16,000. Contracted by the HSE for 183 days’ work, Mr Anderson has earned in excess of €600,000 since 2005.
Another adviser to Prof Drumm, Maureen Lynott, was paid a total of €126,608 in the first six months of 2008. Ms Lynott, a former chairwoman of the National Treatment Purchase Fund, earned €317,005 in 2007 and €264,638 in 2006 for her services, bringing her total to well over €700,000 since 2006.
Human resources consultant Maureen McGrath was paid €147,828 for the first six months of 2008. This despite the fact that the HSE already has a national director of human resources, Seán McGrath.
The list of external consultants used by the HSE shows a large number are hired for HR consultancy purposes. In 2006 and 2007, Ms McGrath’s company was paid €590,976 for its services.
Public relations firms have also benefited from being on the HSE books. In 2007, Wilson Hartnell public relations firm was paid €481,812 for "public relations support" to the HSE.
In the same year, Janet Hughes was paid in the region of €17,500 for her public relations advice.
Phil Flynn, the former banker and trade union leader, who was investigated as part of the Garda inquiry into IRA money-laundering as a result of the Northern Bank robbery in 2005, is also on the books of the HSE.
In 2008, Mr Flynn was paid €52,126 for mediation and arbitration services in negotiations between the HSE and the public service trade union, IMPACT.