Ambulance transportation services that are covered in Medicare part B covers ground ambulance transportation when a patient needs to be transported to a hospital, critical access hospital, or skilled nursing facility for medically necessary services while the transportation in another vehicle could be hazardous for patient’s health. However, ambulance transportation has certain risks.
The risk involved in Ambulance transportation
Emergency Medical Services (EMS) is included in Ambulance and patient transport services while private ambulance services which supply various services such as emergency prehospital care, basic medical support and roadside transport to hospitals for patients experiencing medical emergencies, However, ambulance transportation has certain risk such as high speeds and the use of lights, sirens, which potentially results in ambulance crashes that may injure or cause the death of patients, providers, pedestrians.
To make ambulance transport safer various guidelines are currently being developed
- Drive cautiously at safe speeds, observing traffic laws,
- Encourage the utilization of the Department of Transportation National Highway Traffic Safety Administration Emergency Vehicle Operating Course (EVOC), and National Standard Curriculum
An immediate response is one in which the ambulance supplier begins as quickly as possible to take the steps necessary to respond to the call and emergency ambulance services are provided after the sudden medical condition.
Role of Emergency Medical Technician for prehospital ambulance transport
Generally, hospitalists directly interact with ambulance transport teams who have picked patients up from their homes or other nonmedical settings and brought them to the hospital. But an emergency medical technician (EMT) may be the primary provider on prehospital ambulance transport.
EMTs are typically undergone approximately 40 to 100 hours of medical training in which a small portion may be pediatric. Moreover, These EMTs have limited assessment and interventional capabilities, also local statutes govern what procedures EMTs can perform during transport.
While a higher level of EMS transport involves paramedics who have approximately 1 year of medical training and usually at least 16 hours and a limited practicum involving pediatrics.
Origin/Destination Modifier Pairs, BLS vs. ALS Level Billing, and the Non-Emergency Medical Necessity Trap
Where most ambulance billing guides stop at listing modifier codes, the three areas that directly determine whether a claim pays or denies go consistently unaddressed, and each represents a distinct revenue risk for ambulance suppliers billing under Medicare Part B.
The first is origin and destination modifier pairs. Medicare requires every ground ambulance claim to carry a two-letter modifier identifying where the transport began and where it ended, and these modifiers are not interchangeable. The most frequently used pairs include SH (scene to hospital), SD (scene to hospital for a patient receiving renal dialysis), HH (hospital to hospital), and GH (residential facility to hospital).
Submitting a claim without the correct pairing, or selecting a modifier that does not match the documentation in the Patient Care Report, results in automatic denial with no appeal pathway unless the documentation is corrected at source.
The second is the BLS versus ALS level distinction, which is not a clinical judgment call but a billing-level determination governed by specific CMS criteria. BLS (A0425/A0427) is appropriate when the patient requires monitoring and basic interventions; ALS-1 (A0426/A0427) applies when the patient requires one or more ALS interventions; and ALS-2 (A0433) requires three or more separate ALS interventions or an ALS assessment plus at least one ALS intervention during transport.
Billing ALS-2 without crew documentation of the specific interventions performed is among the top OIG audit targets in ambulance billing. The third is the non-emergency medical necessity threshold, where the financial exposure is largest for high-volume non-emergency transport providers.
Medicare requires that non-emergency transports be supported by a Physician Certification Statement (PCS) or a signed order confirming the patient cannot be safely transported by any other means — and in 2025–2026, MAC contractors including Novitas Solutions have intensified post-payment reviews specifically targeting non-emergency claims lacking a compliant PCS on file at the time of transport.
MBC’s ambulance billing specialists manage origin/destination modifier pairing, BLS/ALS level validation, and PCS compliance as core pre-submission checkpoints, ensuring your claims survive MAC scrutiny and convert transports into protected revenue.
Reimbursement for Ambulance Services
All insurance companies including Medicare and Medicaid pay for ambulance and emergency services. However, the unique and detailed modifiers and the various modes of transport include ground, water, fixed-wing, and rotary-wing make coding and billing for ambulance transportation services complicated.
Healthcare providers should record correct clinical documentation during the case for reimbursement. Moreover, coding and billing are strictly based on this recorded documentation, so the documentation must be complete and accurate.
CPT codes that are used in ambulance transportation billing are relatively low but we can witness various unique modifiers and the complicating factors which have a significant impact on reimbursement.
The CPT codes for ambulance Transportation:
There are seven categories of ground ambulance services which include both land and water transportation. The selection of codes is based on the patient’s condition at the time of transport as well as services rendered.
- A0425 Ground mileage, per statute mile
- A0426 Ambulance service, (ALS), non-emergency transport (Level 1)
- A0427 – ALS (Level 1), Emergency
- A0428 – Basic Life Support, Non-Emergency
- A0429 – Basic Life Support, Emergency
- A0433 –Advanced life support, level 2 (ALS2)
- A0434- Specialty Care Transport (SCT)
Now, let’s look at some modifiers as these modifiers are two characters that represent origin and destination, and they are designed to show first the origin and second the destination:
Some of the modifiers for Ambulance Transportation
- D –Diagnostic or therapeutic site excluded P or H when these are used as origin codes
- E- Residential, domiciliary, custodial facility excluded 1819 facility
- G –Hospital-based ESRD facility
- H –Hospital
- I –Site of transfer between modes
- J –Freestanding ESRD facility
- N Skilled nursing facility
- P Physician’s office
- R Residence
- S Scene of accident or such acute event
- X Intermediate stop at physician’s office along the way to the hospital
Some second modifiers for Ambulance Transportation
Now let’s look at some second modifiers to be included after the origin and destination modifier. These can include but are not limited to:
- CR – Related to a catastrophe or declared disaster
- GA – ABN was required and obtained
- GM – Multiple patient modes of transport
- GW – Hospice patient, unrelated to the hospice diagnosis
- GX – ABN was optional and obtained
- GY – Service that is statutorily excluded
- GZ – ABN was required but not obtained
- QJ – Incarcerated patient
- QL – Patient pronounced dead after ambulance called
- QM – Under the arrangement
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FAQs
Medicare Part B covers ground ambulance transportation when it is medically necessary, such as transporting a patient to a hospital, critical access hospital, or skilled nursing facility, especially when other forms of transport would endanger the patient’s health.
Ambulance transportation can involve risks, including high speeds, lights, and sirens, which may increase the potential for crashes. These incidents can result in injuries to patients, providers, and pedestrians.
Emergency Medical Technicians (EMTs) or paramedics typically provide prehospital care during ambulance transport. EMTs have basic medical training, while paramedics undergo more extensive training and can perform advanced procedures during transport.
Ambulance transportation is billed using specific CPT codes based on the level of service provided, such as Basic Life Support (BLS) or Advanced Life Support (ALS). Reimbursement is determined by the type of transport, medical necessity, and proper documentation.
Common CPT codes for ambulance services include A0425 for ground mileage, A0427 for ALS emergency services, and A0429 for BLS emergency services. These codes help specify the level of care and type of transport provided.
Ambulance billing uses origin and destination modifiers, such as H for Hospital, R for Residence, and N for Skilled Nursing Facility, to indicate where the transport began and ended. Additional modifiers (e.g., CR for disaster-related services) may also apply.
Yes, most private insurance companies, as well as Medicare and Medicaid, cover ambulance transportation services, provided the transport is medically necessary and proper billing and documentation are submitted.
A Medical Coding Subject Matter Expert with over 16 years of experience in ICD-10 and CPT coding, clinical documentation, and revenue cycle management. Shares actionable insights to improve billing accuracy and support compliance-driven healthcare practices.
