The Health Minister has dismissed all members of the Southern District Health Board and replaced them with a commissioner.
Jonathan Coleman wrote to the DHB today saying he had no confidence in the Board's ability to suitably handle longstanding financial problems.
The Southern DHB's deficit forecast for the 2015/16 financial year accounted for more than half the combined deficit of all 20 DHBs, Mr Coleman said.
"Southern is forecasting a final deficit of $27 million for the current financial year. That figure has effectively doubled in the last six months ... This situation of fluctuating forecasts and progressively worsening deficits cannot continue."
Kathy Grant has been appointed as Commissioner, and Mr Coleman said she brought "significant local knowledge" to the role.