Specialty
Ambulance billing services
Ambulance billing services turn a run report into a claim Medicare will pay: the level of care the crew actually gave, coded A0426 to A0429 or higher, loaded miles on A0425 to the tenth of a mile, a two-letter origin and destination modifier, and the ZIP code where the patient was put on board, which sets the price.
See where claims are getting stuck. No patient data needed.
Behind every non-emergency trip sit the test that any other transport was contraindicated, a physician certification statement and, for repetitive scheduled trips, prior authorization. Remitwright gives ground ambulance services a dedicated biller who reads each run report against those rules and works denials to the cause.
Ambulance billing is one of Remitwright's specialty billing services, each set out with its own code families, denial reasons and payer rules.
Last reviewed by the Remitwright billing team. Editorial policy
- 0540
- A0425
- A0426
Denials
Why ambulance claims get denied
The reasons that come up most on ambulance remittances, with the usual cause and the fix. Code explanations are our own; the official list is maintained by X12.
| Code | Reason | Usual cause | The fix |
|---|---|---|---|
| CO-50 | Other transport not ruled out | The run report shows a patient who walked to the stretcher, sat up in a chair or needed no monitoring, so nothing shows that a car, van or wheelchair vehicle would have put the patient at risk | Each run report read for the patient's condition at the time of transport before the claim is built, with any trip that does not meet the test held back from billing as covered |
| CO-16 | Pickup ZIP or trip modifier missing | No point-of-pickup ZIP code, several ZIP codes on one paper claim, or no origin and destination modifier, so the claim comes back unprocessable | ZIP code and modifier taken from the run report's addresses for every leg, and a separate claim for each pickup ZIP code on paper |
| CO-150 | Level of care not supported | ALS billed with no ALS assessment or intervention in the record, ALS2 billed on two IV doses or on doses split to reach three, or specialty care transport billed for care a paramedic may give in that state | Level coded from the care the crew documented, never from the vehicle sent or the level the dispatcher requested |
| CO-97 | Supply billed apart from the trip | Oxygen, drugs, an extra attendant, supplies or an EKG billed on their own lines, when the fee schedule pays them inside the base rate | Only the base rate line and the mileage line billed for each trip, with supplies documented in the run report and left off the claim |
| CO-40 | Not an emergency response | A0427 or A0429 billed for a scheduled call, or for a call the dispatch record does not show as an immediate response under the local 911 protocol | Emergency codes tied to the dispatch record, and non-emergency codes used for every scheduled or routine transfer |
| CO-58 | Destination not covered | A trip ending at a physician's office or another place that is not a covered destination, or mileage past the nearest appropriate facility without a reason in the record | Destination checked against the covered list, with mileage beyond the nearest appropriate facility removed unless the record explains it |
Codes
Common ambulance codes and modifiers
Code families by number with our own one-line explanations. CPT descriptors belong to the AMA and are not reproduced here.
| Codes | What the codes cover |
|---|---|
| Revenue code 0540 with QM or QN | How a hospital or other provider-based ambulance bills on the institutional claim: each loaded one-way trip as a pair of 0540 lines, one for the level and one for the mileage, on type of bill 13X, 22X, 23X, 83X or 85X, with the pickup ZIP code as value code A0. |
| A0425 | Ground mileage, loaded miles only, billed on its own line. Up to 100 miles the total is rounded up to the next tenth (0.9, 12.3); at 100 miles and over it is rounded up to a whole mile. Rural pickups are paid more per mile. |
| A0426, A0427 | Advanced life support, level 1: an ALS assessment by ALS personnel or at least one ALS intervention, non-emergency (A0426) or as an emergency response (A0427). An ALS crew that completes an ALS assessment on a properly dispatched emergency call is paid at the ALS emergency level even if no intervention follows. |
| A0428, A0429 | Basic life support, crewed by at least two people with at least one certified as an EMT-Basic or higher. A0428 for a non-emergency trip, A0429 when the crew responded at once to a 911 call or its equivalent. An emergency response does not by itself make the trip medically necessary. |
| A0433 | Advanced life support, level 2: at least three separate IV push, bolus or continuous infusion doses of medication other than crystalloid fluids, or one listed procedure such as manual defibrillation, intubation, a central or intraosseous line, cardiac pacing, chest decompression, a surgical airway or prehospital blood transfusion. |
| A0434 | Specialty care transport: an interfacility trip for a critically ill or injured patient who needs ongoing care beyond the scope of the paramedic, given by a nurse or other specialty professional or a paramedic with the extra training the state recognizes. |
Modifiers that matter
- Origin and destination modifier
- Two letters on every trip, pickup first and drop-off second: R residence, H hospital, N skilled nursing facility, E residential or custodial facility, G or J dialysis facility, S scene of an accident or acute event, P physician's office, D diagnostic or therapeutic site, I a transfer point between modes. X is a destination only, for a stop at a physician's office on the way to the hospital.
- QM and QN
- Required from provider-based services on every HCPCS line: QM when the trip was furnished under arrangement by another company, QN when the provider furnished it directly.
- GM
- On every service line when more than one patient was on board, with documentation of how many patients rode together and each Medicare patient's identifier.
- QL
- Used in place of the origin and destination pair when the patient was pronounced dead after the ambulance was dispatched but before being loaded. Medicare pays the BLS base rate (A0428, or A0429 for an emergency response) with no mileage.
Ambulance or NEMT: two benefits, two kinds of claim
Ambulance billing is for patients whose condition rules out any other way to travel. Medicare pays it under Part B on the ambulance fee schedule, by level of care and loaded mile, and only when any other means of transport would have endangered the patient, whether or not other transport was available.
Non-emergency medical transportation, or NEMT, is a Medicaid benefit for people who need to reach covered care and have no way to get there. Rides go by wheelchair van, taxi, stretcher car or bus. Many states require each trip to be authorized before it runs, often through a broker or a managed care plan, and fee-for-service transport providers are paid only for loaded miles. An NEMT claim answers to the state's or broker's trip rules rather than to the ambulance fee schedule. Remitwright covers broker trips, state Medicaid rules and the trip logs behind them on the NEMT billing page.5
Payers
Payer notes
- MedicarePayment is a base rate for the level of service plus a separate loaded-mileage payment. The base rate is the conversion factor times the level's relative value, 1.00 for BLS, 1.60 for BLS emergency, 1.20 for ALS1, 1.90 for ALS1 emergency, 2.75 for ALS2, 3.25 for specialty care transport and 1.75 for paramedic intercept, with 70 percent of it adjusted by the practice expense index for the pickup location. The ambulance inflation factor for 2026 is 2.0 percent.1
- MedicareNon-emergency BLS trips to and from dialysis, A0428 with G or J in either position of the modifier, have been paid 23 percent less since October 1, 2018, mileage included. Emergency trips and non-emergency trips to other destinations are not reduced.1
- MedicareA scheduled, repetitive non-emergency trip is covered only if the service has a physician certification statement, dated no earlier than 60 days before the trip, in hand before it runs. For an unscheduled or non-repetitive trip of a facility resident under a physician's care, the statement may be obtained within 48 hours after the trip; if the physician's statement cannot be had, a physician assistant, nurse practitioner, clinical nurse specialist, RN, LPN, social worker, case manager or discharge planner may sign instead, and after 21 days of documented attempts the claim may go in with proof such as a signed return receipt.3
- MedicarePrior authorization for repetitive, scheduled non-emergent ambulance transport was expanded nationwide in phases ending in August 2022. It is voluntary, but a supplier that skips it has those claims reviewed before payment; the first three round trips may be billed without it and without that review.4
- MedicareA supplier's trip dated inside a hospital inpatient stay is recouped once the hospital's claim posts, while trips on the admission or discharge date stay payable. During a covered SNF Part A stay, transport to most services is part of the facility's payment.1
- MedicaidFederal rules require each state Medicaid agency to assure necessary transportation to and from providers in its state plan, which is the basis for NEMT, and to describe the methods it uses to do so. Those methods, and the ambulance and NEMT rules that follow from them, differ from state to state.6
Authorizations
Medicare's paperwork for non-emergency transport comes in two layers. The physician certification statement has to exist before a scheduled repetitive trip and within the allowed window after an unscheduled one, and for repetitive scheduled trips the MAC's prior authorization decides whether the claims are paid on receipt or reviewed first. Emergency calls rest on the dispatch record and the run report instead. Medicaid programs and commercial plans set their own authorization rules for non-emergency ambulance, so your biller keeps them by payer, checks the PCS date and any authorization before a trip is billed, and holds a claim whose paperwork is not complete.
Documentation traps
- A run report that names the diagnosis but never says why the patient could not travel by car, van or wheelchair vehicle that day
- Bed-confined written as bed rest or non-ambulatory, when Medicare's test is unable to get up from bed without help, unable to walk and unable to sit in a chair or wheelchair
- Loaded miles rounded to whole numbers on a short trip, or the miles driven before the patient was on board included in the total
- A physician certification statement dated more than 60 days before a repetitive trip, or signed after the scheduled trip it is meant to support
- Dispatch notes missing from the record, so an emergency code cannot be tied to a 911 call or its equivalent
- Supplies, oxygen and medications charted well but also entered as separate charges that the fee schedule already pays in the base rate
What a specialist checks
Specialist or generalist for ambulance billing?
A generalist biller can enter an ambulance claim. Whether it pays turns on three things specific to ambulance billing, and a specialty-aware biller checks each one.
Billing codes
Each code reported with what the record has to show for it.
- Revenue code 0540 with QM or QN
- A0425
- A0426, A0427
Modifiers
Applied only where the note supports them, line by line.
- Origin and destination modifier
- QM and QN
- GM
If you are moving from another billing company or an in-house biller, switching billing companies follows a plan: the old and new processes run side by side until the new one is proven, and every login and every ambulance claim stays in your name.
What we handle
What we handle for ambulance services
- Medicare billingPart B claims, MSP, ABNs and appeals
- Medicaid billingState and MCO claims under each plan's rules
- Prior authorizationAuths requested, tracked, attached to claims
- Claim submissionScrubbed, submitted and tracked to acceptance
- Denial managementEvery denial read, worked and appealed
- Claim appealsWritten appeals, right level, right deadline
A dedicated biller with named cover, working inside your system and reporting to you on one written page. How it works sets out the five stages.
Worked example: the dialysis run that kept getting reviewed
A ground ambulance service takes a bed-confined patient from home to a freestanding dialysis facility three times a week. The trips are billed as A0428 with modifier RJ out and JR back, but no prior authorization request was ever filed, so every claim after the third round trip goes to prepayment review and payment waits on records requests.
The biller files the prior authorization request with the physician certification statement and the records that show the patient's condition, sets the PCS renewal date ahead of its 60-day limit, and checks each new claim against the authorization before release. The dialysis reduction is expected on these trips, so the posted payments are compared against the reduced rate rather than flagged as underpaid.
Software
Systems ambulance services usually run
- ZOLL Billing
- ESO
- ImageTrend
- Traumasoft
Your biller works inside your system as a user you create. All the systems we work in.
Questions
Questions about ambulance billing
What makes an ambulance trip medically necessary for Medicare?
Is a 911 call always billed at the emergency level?
How is ambulance mileage reported?
When do we need a physician certification statement?
Do we have to use prior authorization for repetitive dialysis trips?
Can a hospital-based ambulance bill the same way as an independent service?
What does an ambulance service give its biller to start?
Next step
See where your ambulance claims are getting stuck.
Three quick questions. No patient data. A billing specialist reads every request and replies in writing.
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- No patient data, no software to buy
- A written reply from a biller, not a sales deck
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- A billing specialist reads your answers and replies by email.
- If a look at real claims makes sense, we agree read-only access under a BAA first.
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While you wait: see the sample weekly report or read how switching works. You can also download the sample weekly report (PDF).