The new patient transfer taxi contract will be discussed when Tynwald sits this week.
Douglas North MHK David Ashford wants to know how long ComCab Liverpool's deal with the Department of Health and Social Care is for, how the quality will be monitored and if there are exit clauses if standards slip.
Mr Ashford will also seek details about the difference between the new contract and the previous arrangements.
Health Minister Kate Beecroft refused to reveal details about the new contractor in last week's House of Keys sitting, but the new provider has now been confirmed.
ComCab Liverpool will replace Bridgewater Cars later this month.
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