Media reports state that Kingston has lost £500,000 before the system is even installed, as it continues to have to pay IT contractors to maintain existing systems.
In its December board minutes, Kingston said: "Continuing upgrades to PAS were not sustainable in the longer term, and it was also highlighted that the postponement had a consequential knock on effect of slowing down implementation of other key Trust IT projects."
Earlier this week the chief executive of Royal Free, Andrew Way, publicly slammed the system for, saying it had caused "heartache and hard work" at his hospital.
The Royal Free has lost £10 million as a result of installing the computer system.
NHS London said NHS London Programme for IT is working with each trust to "help minimise any adverse effects of the delays to the implementation of the Cerner Millennium electronic patient records system within London.
"There are no trusts in London currently seeking compensation for any losses they have experienced as a result of this."
Following a review in October by the London Acute Programme Board, the NHS London Programme for IT has been working with BT and Cerner to "resolve outstanding issues" at the four acute trusts -- Royal Free, Barnet and Chase Farm, Queen Mary's Sidcup, Barts and the London - currently live with Cerner Millennium.
NHS said: "Several upgrades have been made to the Cerner Millennium London Configuration 1 (LC1) software currently being used by the Royal Free Hampstead NHS Trust to streamline and enhance the system for users." Improvements are also being made at the trusts using the LC0 version of Cerner Millennium.
BT would not comment.
NHS said it was working with trusts on agreeing appropriate go-live dates with these trusts.