Medical transportation billing runs on two separate tracks. Ambulance services bill Medicare, Medicaid, and commercial plans for each transport and each loaded mile, while non-emergency medical transportation is almost entirely a Medicaid benefit paid through state brokers. A company that runs both needs two sets of codes, two enrollment paths, and two ways of proving the trip was necessary.
Key Takeaways
- Ground ambulance bills a base rate by level of service (A0426 through A0434) plus loaded mileage under A0425.
- Every ambulance claim carries a two-letter origin and destination modifier, such as RH for residence to hospital.
- Non-emergency ambulance trips need a physician certification statement, and Medicare requires prior authorization for repetitive scheduled transports like dialysis runs.
- NEMT is a Medicaid benefit, usually run by a state broker that contracts with and credentials transportation providers.
- Ground ambulance isn’t covered by the federal No Surprises Act, but many states have their own balance billing limits.
Ambulance Billing
Ground ambulance claims have two parts. The base rate is set by the level of service the patient needed. A0428 and A0429 cover basic life support for non-emergency and emergency transports, A0426 and A0427 cover advanced life support level 1, A0433 covers ALS level 2, and A0434 covers specialty care transport. Mileage bills separately under A0425 for each statute mile the patient was on board, and miles driven before pickup or after drop-off aren’t billable.
Air ambulance follows the same structure with its own codes. A0430 and A0431 cover fixed-wing and rotary-wing transports, and A0435 and A0436 cover air mileage.
Origin and destination modifiers
Each ambulance line carries a two-letter modifier showing where the trip started and ended. R stands for residence, H for hospital, N for skilled nursing facility, P for physician office, S for the scene of an accident, J for a freestanding dialysis facility, and D for a diagnostic site. A transport from a patient’s home to the emergency department bills as RH. Medicare pays for transport to the nearest facility that can treat the patient, so the destination code and the documentation have to support where the patient was taken.
Medicare Rules for Ambulance Transport
Medicare covers ambulance transport only when the patient’s condition makes any other form of transport unsafe. The crew’s run report carries most of that weight. It has to describe the patient’s condition at pickup, the treatment given, and why a car, taxi, or wheelchair van wasn’t an option. A report that says “patient transported without incident” won’t support medical necessity.
Non-emergency transports need a physician certification statement explaining why ambulance transport was required. For repetitive scheduled trips, like three-times-weekly dialysis runs, the statement has to be dated no more than 60 days before the transport. Medicare also requires prior authorization for repetitive scheduled non-emergent transports, so the approval has to be on file before the first trip in a series.
When a transport may not meet Medicare’s rules, the patient should sign an Advance Beneficiary Notice before the trip, and the claim carries the GA modifier. A patient pronounced dead after the ambulance was dispatched but before transport has its own billing rules, and the claim uses the QL modifier.
Non-Emergency Medical Transportation
Federal law requires state Medicaid programs to provide non-emergency medical transportation for enrollees who have no other way to get to covered appointments. Most states run NEMT through a broker that schedules rides, assigns them to contracted transportation providers, and pays those providers. A wheelchair van or ambulatory transport company usually bills the broker, not the state, under the broker’s rate schedule and trip rules.
NEMT trips use their own HCPCS codes. Common ones include A0130 for a wheelchair van, T2005 for a stretcher van, A0100 for a taxi, T2003 for a trip billed as an encounter, and S0209 or S0215 for mileage. Each state and broker decides which codes it accepts. Brokers also expect proof that the trip happened, such as signed trip logs, GPS records, and pickup and drop-off times that match the appointment.
Medicare doesn’t cover non-emergency rides outside of ambulance transport. Some Medicare Advantage plans offer rides as a supplemental benefit, often through rideshare platforms, and we explain how that works in whether Uber Health and Lyft Healthcare are covered by insurance.
Balance Billing and Patient Responsibility
The federal No Surprises Act protects patients from balance billing by out-of-network air ambulance providers, but it doesn’t cover ground ambulance. Many states have filled that gap with their own ground ambulance laws that cap what patients can be billed or set a payment standard for out-of-network transports, so the rules depend on the state where the transport happened. Emergency groups face a similar split between federal and state rules, which we cover on our emergency medicine page.
Where Transportation Claims Get Denied
Most transportation denials come from a short list of causes. These include run reports that don’t explain why other transport wasn’t safe, a missing or expired physician certification statement, repetitive transports without a current prior authorization, mileage that doesn’t match the trip addresses, the wrong origin or destination modifier, and NEMT trips billed without the broker’s trip number or signed log. Many of these are fixed before the claim goes out by checking the run report against the billing rules for each payer.
Transportation Provider Credentialing
Ambulance suppliers
Ambulance companies enroll with Medicare as ambulance suppliers, with their state EMS license, each vehicle’s registration, and the certification level of the crews. Medicaid and commercial plans enroll the company separately. Adding a vehicle, a base location, or a higher level of service usually means updating every enrollment before those transports are billed.
NEMT providers
NEMT companies enroll with the state Medicaid program and then credential with the broker, which typically checks driver background screenings, drug testing, vehicle inspections, insurance, and driver training records. Brokers recheck these on a schedule, and a lapsed driver or vehicle file can stop trip assignments. Until enrollment is complete, trips can’t be billed, which is why you can’t bill what you can’t credential.
Medical Transportation Billing FAQ
How is ground ambulance mileage billed?
Under A0425, for each statute mile the patient was on board. Miles driven before pickup or after drop-off aren’t billable, and the mileage has to match the pickup and destination addresses.
What do ambulance origin and destination modifiers mean?
They show where the trip started and ended, using one letter for each. RH means residence to hospital, NH means skilled nursing facility to hospital, and RJ means residence to a freestanding dialysis facility.
Does Medicare require a physician certification statement for ambulance transport?
For non-emergency transports, yes. The statement explains why ambulance transport was needed, and for repetitive scheduled trips it has to be dated no more than 60 days before the transport.
Does Medicare cover non-emergency medical transportation?
Not outside of ambulance transport. NEMT is a Medicaid benefit, and some Medicare Advantage plans offer rides as a supplemental benefit.
Does the No Surprises Act apply to ground ambulance?
No. It covers air ambulance but not ground ambulance. Many states have their own laws limiting balance billing for ground ambulance transports.
How long does transportation provider credentialing take?
Medwave averages 85 days across payers. Medicaid broker credentialing and vehicle or driver reviews can add time, so applications should go in before a new vehicle or service area starts running trips.
Why Transportation Providers Like Medwave
Medwave handles medical transportation billing, credentialing, and payer contracting under one team. We check run reports against medical necessity rules, apply the right level of service and origin and destination modifiers, track certification statements and prior authorizations for repetitive transports, and bill NEMT trips to each broker’s requirements. That’s how we hold a 98% clean claim rate.
On credentialing, we enroll ambulance and NEMT companies with Medicare, Medicaid, brokers, and commercial plans, with an 85-day average turnaround.
Contact Medwave below to see how we can support your transportation company.