The industry's leading experts say government could lose millions unless disparate and costly fibre network contracts are integrated into the A$43 billion (US$31.9 billion) NBN.

Roxon refused to attend a recent meeting with the Digital Economy Industry Workgroup, which includes experts from telecommunications, health and energy sectors, to discuss network exit plans for hospitals and other health agencies.

The workgroup, setup earlier this year, argues millions could be saved by allowing agencies to scrap existing network contracts and standardise on NBN services.

Telecommunications analyst and workgroup member Paul Budde said Roxon must address the issue within her department to ensure agencies are ready to move to the NBN as it is phased in.

"The minister has many pressing issues in health to address so she doesn't want to hear it now... but the risk that agencies will lose out is very real if she does not act," Budde told at a .