What data type is [Dispatch ID]? If it is text, try:
SELECT [Dispatch ID], [Impression], [Destination Basis], [Date Received], [Date Enroute], [Date Arrived], [Date Leave Ref], [Date Arrive Rec], [Crew 2], [First Name], [Last Name], [Date of Birth], [Address Line 1], [City], [State], [Zip Code], [Gender], [Age In Years], [Trauma Code], [EMD Card Number], [Scene Grid], [Receiving Other], [Response Code], [Mode to Ref], [Mileage Loaded], [Mode to Rec], [Receiving Hospital], [GCS First], [GCS Last], [Blood PressureD First], [Blood PressureS First], [Blood PressureD Last], [Blood PressureS Last], [Heart Rate First], [Heart Rate Last], [Respiration First], [Respiration Last], [Procedure Time], DConcat("[Procedure]","[Care Test Data]","[Dispatch ID] = '" & [Dispatch ID] & "'", ";") AS Procedues
FROM [Care Test Data]
GROUP BY [Dispatch ID], [Impression], [Destination Basis], [Date Received], [Date Enroute], [Date Arrived], [Date Leave Ref], [Date Arrive Rec], [Crew 2], [First Name], [Last Name], [Date of Birth], [Address Line 1], [City], [State], [Zip Code], [Gender], [Age In Years], [Trauma Code], [EMD Card Number], [Scene Grid], [Receiving Other], [Response Code], [Mode to Ref], [Mileage Loaded], [Mode to Rec], [Receiving Hospital], [GCS First], [GCS Last], [Blood PressureD First], [Blood PressureS First], [Blood PressureD Last], [Blood PressureS Last], [Heart Rate First], [Heart Rate Last], [Respiration First], [Respiration Last], [Procedure Time];