Infrastructure Minister Michelle Haywood says sending patients for treatment is costing her department more than £650,000 a year.
This week in the House of Keys she faced questions about non-emergency transport from Onchan MHK Julie Edge.
Miss Edge wanted more details about the service after the DOI took it over.
Dr Haywood said it was difficult to give concrete figures for its cost:
Peel's pulsing UFO has people perplexed
Peel MHK raises future of former care home
Netflix film about Patrick's greatest boxer out in November
Three buses won't run, eight more at risk today
Former chief minister to ask first question of new parliament
New children's soft-play coming to tearooms in Laxey
More dates added to food hygiene training
Peel Secret Santa scheme brings hope to Island families this Christmas