Ambulance transportation resource
BLS vs. ALS Ambulance Transportation: What’s the Difference?
BLS and ALS are different levels of ground ambulance service. BLS generally refers to ground ambulance transportation with medically necessary BLS supplies and services under applicable requirements. Under Medicare terminology, ALS1 includes an ALS assessment by ALS personnel or at least one ALS intervention. The requested transport service is coordinated using information from the patient, family, referring healthcare team, and other appropriate sources.
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What is BLS ambulance transportation?
Basic Life Support (BLS) is a ground ambulance service level. In plain language, it describes ambulance transportation furnished at the BLS level under applicable requirements. The details of a requested transport can vary, so the service should be discussed with the patient, family, or referring healthcare team.
For a planned transport, dispatch uses the requested service level and the information available from the people arranging the trip. This resource is general information and is not a clinical assessment or a determination of medical necessity.
What is ALS ambulance transportation?
Advanced Life Support (ALS) is a higher ground ambulance service level than BLS. In Medicare terminology, ALS1 includes an ALS assessment by ALS personnel or at least one ALS intervention. That definition helps distinguish the Medicare service categories; it does not mean a symptom or diagnosis automatically requires ALS.
When ALS transportation is requested, Preferred EMS dispatch coordinates the trip using the information supplied by the patient, family, referring healthcare team, and other appropriate sources. The request and available service information guide coordination; this page does not diagnose a patient or decide medical necessity.
BLS vs. ALS: the key difference
The key difference is the requested level of ground ambulance service. The table below is educational, not a checklist for deciding medical necessity or a promise that a particular service will be available.
| Service level | General distinction | How transport is coordinated | Educational examples |
|---|---|---|---|
| BLS | A ground ambulance service level with BLS supplies and services under applicable requirements. | Dispatch coordinates the requested BLS service using information provided by the patient, family, referring healthcare team, and other appropriate sources. | A requested scheduled transport or facility transfer may be arranged at the BLS level when that service level is requested. |
| ALS | A higher ground ambulance service level; Medicare terminology for ALS1 includes an ALS assessment by ALS personnel or at least one ALS intervention. | Dispatch coordinates the requested ALS service using the information provided for the transport. | A referring healthcare team or other appropriate source may request ALS for a transfer. Examples are educational and do not establish a coverage or medical-necessity rule. |
Who determines the requested ambulance service level?
Preferred EMS dispatch coordinates transportation using information supplied by the patient, family, referring healthcare team, and other appropriate sources. For healthcare-facility transfers, the requesting facility can share the requested service level and relevant transport information.
Dispatch does not independently diagnose a patient or make a medical-necessity determination from a phone call or webpage. If there is a question about the requested level of service, the patient, family, and referring healthcare team should use the appropriate clinical and payer resources for their circumstances.
BLS and ALS for interfacility transfers
Hospitals, skilled nursing facilities, rehabilitation facilities, clinics, and other healthcare settings may coordinate ambulance transportation when transferring a patient. The requesting team can provide the pickup location, destination, requested service level, and relevant transport information.
For an interfacility transfer, Preferred EMS dispatch coordinates the requested BLS or ALS transportation based on the information provided and service availability. The process is designed to support clear transport coordination between the requesting and receiving locations.
BLS and ALS for hospital discharge transportation
Ambulance transportation may be requested for an eligible hospital discharge depending on the patient’s circumstances and the requested service level. Not every discharge requires or qualifies for ambulance transportation.
Patients, families, and discharge planners can contact dispatch with the pickup location, destination, requested service level, and relevant information available from the care team. Coverage, authorization, and eligibility are separate questions that depend on individual circumstances and applicable payer requirements.
Does Medicare cover BLS or ALS ambulance transportation?
Medicare coverage is not based simply on whether a transport is labeled BLS or ALS. Under Medicare rules, ambulance transportation generally must meet applicable coverage requirements, including medical necessity, and the beneficiary’s condition must require both ambulance transportation itself and the level of service furnished.
Bed confinement alone is not the sole criterion for medical necessity. Coverage depends on individual circumstances and applicable payer requirements, and payment, authorization, reimbursement, and claim approval are not guaranteed. When appropriate, patients and families should verify benefits and coverage with their payer and consult the applicable Medicare guidance.
BLS and ALS ambulance transportation in Houston
From its Houston base, Preferred EMS coordinates requested BLS and ALS ambulance transportation for Houston and communities throughout Greater Houston that it serves. Patients, families, hospitals, skilled nursing facilities, rehabilitation facilities, and other healthcare teams can contact dispatch to coordinate transportation.
For a Houston-area request, provide the pickup location, destination, requested service level, and the relevant transport information available from the patient, family, or referring healthcare team.
How to request ambulance transportation
Contact Preferred EMS dispatch
Call (713) 791-9000 or submit a transport request online.
Share pickup and destination
Provide the pickup location and destination for the requested transport.
Provide requested service information
Share the requested service level and relevant transport information available from the patient, family, or referring healthcare team.
Dispatch coordinates the request
Dispatch coordinates the transport based on the information provided and service availability.
Related Preferred EMS resources
Frequently asked questions
What is the difference between BLS and ALS ambulance transportation?
BLS and ALS are different levels of ground ambulance service. ALS is a higher service level; under Medicare terminology, ALS1 includes an ALS assessment by ALS personnel or at least one ALS intervention. The requested service is coordinated using information provided for the transport.
Is ALS always an emergency ambulance service?
No. ALS is a service level, not a statement that every transport is an emergency. The requested service depends on the circumstances and information supplied by the patient, family, referring healthcare team, and other appropriate sources.
Can BLS or ALS be used for an interfacility transfer?
Hospitals, skilled nursing facilities, rehabilitation facilities, and other healthcare settings may request BLS or ALS ambulance transportation for an interfacility transfer. Dispatch coordinates the requested service using the information provided.
Can an ambulance be used for a hospital discharge?
Ambulance transportation may be requested for an eligible hospital discharge depending on the patient’s circumstances and requested service level. Not every discharge requires or qualifies for ambulance transportation.
Does Medicare cover BLS and ALS ambulance transportation?
Coverage is not based simply on a BLS or ALS label. Medicare ambulance transportation generally must meet applicable coverage requirements, including medical necessity, and coverage depends on individual circumstances and applicable payer requirements.
How do I request BLS or ALS ambulance transportation in Houston?
Contact Preferred EMS dispatch at (713) 791-9000 or submit a request online. Provide the pickup location, destination, requested service level, and relevant information available from the patient, family, or referring healthcare team.
Need to coordinate ambulance transportation?
Contact Preferred EMS dispatch at (713) 791-9000 to request ambulance transportation in Houston and Greater Houston.