These are private companies providing a service. Most commonly, the Ambulance company will bill the patient if he does not have insurance. They will also bill the insurance companies for their services.
- What is ambulance billing? – http://wiki.answers.com/Q/What_is_ambulance_billing
- how much is an ambulance bill? – http://www.chacha.com/question/how-much-is-an-ambulance-bill
- Which companies offer ambulance billing services? – http://wiki.answers.com/Q/Which_companies_offer_ambulance_billing_services
- How many times can you call an ambulance before you are billed? – http://wiki.answers.com/Q/How_many_times_can_you_call_an_ambulance_before_you_are_billed