Lynn and Wisbech Support Group for children and families with diabetes (KIWI) claims patients wanting to use insulin pump therapy as an alternative diabetes management to insulin injections "come up against a brick wall" because of the health service's debts.
But the new Norfolk Primary Care Trust (PCT), which is almost £50 million in debt, said the only reason there are not more users is because there is no demand.
Julie Widdowson, West Norfolk's diabetes educator/practitioner for Norfolk PCT, said: "Our financial situation has nothing to do with it."
KIWI spokeswoman Joanne Dowen, whose son Christian (8) is diabetic, said: "Consultants are reluctant to agree to pumps as it costs £300 more per patient, per year, to have the pump, yet one day in hospital from diabetic complications can cost £350."
The pump is only suitable for type one diabetics – roughly ten to 15 per cent of West Norfolk's 7,500 diabetics including all 110 children.
Instead of multiple daily injections, the pump delivers a continuous 24-hour insulin supply.
Claire Nash (37), of Dersingham, is the only patient in West Norfolk with the pump.
"I do feel very lucky," said Mrs Nash, who pushed her consultant to get the system.