Level of service coding
BLS, ALS, ALS-2 and specialty care transport pay very differently and must match the documented level of care provided during the transport, not the vehicle dispatched.
Specialties › Ambulance & EMS
Ambulance & EMS Billing Services
Ambulance billing is coded almost entirely in modifiers. A two-letter origin-and-destination modifier on every claim tells the payer where the transport began and ended, the level of service must match what the crew actually provided, and medical necessity has to justify why the patient needed an ambulance rather than any other transport. Miss one piece and the whole trip denies — and EMS agencies run thousands of trips a month.
What makes it hard
Ambulance & EMS billing challenges we solve
These are the issues that repeat every month in ambulance & ems practices — and the ones we fix at the source rather than reworking claim by claim.
Origin and destination modifiers
Every claim carries a two-letter modifier encoding where the transport started and ended. An incorrect origin/destination pairing denies the claim outright.
Medical necessity for the transport
Payers require documentation that the patient's condition required ambulance transport specifically. Non-emergency transports are held to an especially high standard.
Prior authorization for repetitive transport
Scheduled, repetitive non-emergency transports (such as dialysis runs) commonly require prior authorization, and delivering them without it forfeits payment.
Mileage and loaded miles
Mileage is billed as loaded miles from pickup to destination and must reconcile with the run sheet. Mismatches trigger denials and audit interest.
Coding depth
Common code families we work with
- A0428 / A0429 — BLS non-emergency and emergency transport
- A0426 / A0427 — ALS non-emergency and emergency transport
- A0433 — ALS level 2 transport
- A0434 — specialty care transport
- A0425 — ground mileage, per loaded mile
- Origin/destination modifiers (e.g. RH, HR, RN, SH, HN)
- Prior authorization for scheduled repetitive transport
Listed for context only — this is not billing advice, and payer policy varies. Our certified coders work to AAPC and AHIMA standards.
Denial prevention
Top denial drivers in ambulance & ems
- Level of service not supported by the run documentation
- Incorrect origin/destination modifier
- Medical necessity for ambulance transport not documented
- Repetitive non-emergency transport without authorization
- Mileage not matching the loaded distance on the run sheet
We root-cause denials by payer and procedure, then fix the upstream workflow so the same denial stops recurring.
Why ERG
What you get with ERG
Specialty-trained billers
Your account is worked by people who bill ambulance & ems every day — not a general pool learning your rules on your claims.
95%+ net collection rate
Relentless follow-up on every claim, with aged A/R worked rather than written off.
No long-term contract
Performance-based pricing — a percentage of what we collect. Stay because the results are good, not because you are locked in.
5–10 day onboarding
We run parallel with your current process until the transition is verifiably clean.
Human-led, AI-supported
Our certified coders work every claim; AI tools help them catch more before submission.
HIPAA-compliant throughout
Strict PHI controls, access limits and staff training across the whole workflow.
FAQ
Ambulance & EMS billing — common questions
Do you handle both emergency and non-emergency transport?
Yes. Emergency transports turn on medical necessity documentation; non-emergency and repetitive transports turn on prior authorization. Both fail in predictable ways, and we bill to prevent each.
Can you manage prior authorization for dialysis and scheduled runs?
Yes. Repetitive non-emergency transport is authorization-driven, and running it without authorization is unrecoverable. We obtain and track those authorizations before the trips occur.
Do you know the origin/destination modifier rules?
Yes. That modifier is on every ambulance claim and is one of the most common single-character causes of denial. We assign it from the run documentation, not by assumption.
We are a small EMS agency — is outsourcing worth it?
High trip volume with heavy modifier and authorization requirements is exactly where systematic billing pays. We price as a percentage of collections, so cost scales with what we recover.
Client results
What practices say about working with us
★★★★★Our A/R days dropped from 58 to 31 in one quarter. First time in years I actually trust my numbers.
— Sarah M., Practice Manager
★★★★★Denials were killing us. First-pass acceptance went up fast, and they tell us why a claim failed — not just rework it quietly.
— Michael R., Billing Lead
Next step
See what your ambulance & ems practice is leaving uncollected
A no-obligation A/R analysis. We review your aging, denial patterns and coding mix, then show you exactly where the recoverable revenue is.
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