The President of the Irish Medical Organisation says he "utterly rejects" that details of George McNeice's pay deal was widely known in the IMO.
Dr Paul McKeown is accusing the organisation's former Chief Executive of trying to "rewrite history" - by claiming his pension was not a secret.
An independent inquiry is to be carried out to determine how the contract - allowing for a package of almost 10 million euro - was agreed.
The IMO President says he was shocked at the "excessive" retirement deal - and "disgusted" by Dr McNeice's attempts to justify the arrangements.
Paul McKeown - speaking at the opening of the IMO annual conference in Killarney in Co Kerry - says everybody was not aware of the pay package: