ICD code V43.73XA – Person on outside of car, collision with pick-up truck, traffic

Key takeaways

V43.73XA codes an injury to a person riding on the outside of a car when it collides with a pick-up truck on a public road.

The 4th character 7 sets the role and traffic status. The 5th character 3 names a pick-up truck as the other vehicle.

Use V43.23XA when the same collision happens entirely off the public highway, such as in a private parking lot or on a farm.

External cause codes like V43.73XA are never first-listed. They follow the S00-T88 code that describes the injury itself.

Pabau, the practice management platform we build, scrubs each claim for missing or invalid details before it reaches the clearinghouse.

ICD-10 code V43.73XA: Definition and quick reference

ICD-10 code V43.73XA is the billable code for a person on the outside of a car hit by a pick-up truck in a traffic accident.

It covers the initial encounter. The code set is maintained by the Centers for Medicare & Medicaid Services (CMS) and the National Center for Health Statistics (NCHS). Every neighboring transport code has its own entry in our ICD-10-CM library for coders.

It applies when the patient was riding on the car’s bodywork, bumper, roof, running board or step, and the crash happened on a public road. The 7th character A marks the encounter where the injury is under active treatment. V43.73XA is an external cause code, so it always follows the injury code on the claim.

Who counts as a “person on outside of car”?

ICD-10-CM defines a person on the outside of a vehicle as someone transported by it without occupying the driver’s, passengers’ or cargo space. The tabular list names traveling on the bodywork, bumper, fender, roof, running board or step, and hanging on the outside.

That definition rules out most crash patients. A driver is the occupant operating the car, and a passenger is any other occupant inside it. Both have their own V43 codes. V43.73XA fits a narrow set of cases, such as someone riding on a step or clinging to a door frame.

Two vehicle definitions matter as well. A car is a four-wheeled motor vehicle designed primarily for carrying up to 7 persons, and it does not include a van or minivan. If the patient was riding outside a pick-up truck, SUV or minivan, the injury belongs in V50-V59, not V43.

Code breakdown: What each character means

Each character in V43.73XA carries a specific meaning. Misreading a single position produces a code for a different accident, and often a denied claim.

The 4th character carries two facts at once: the injured person’s role and the traffic status. In V43, 7 means a person on the outside of the car in a traffic accident. The same role in a nontraffic accident takes 2.

The 5th character names the other vehicle. It is 1 for an SUV, 2 for another type of car, 3 for a pick-up truck and 4 for a van. Swap the 3 for a 1 and the code becomes V43.71XA, the same rider hit by an SUV.

The placeholder X at position 6 is not optional. Under ICD-10-CM Official Guidelines Section I.A.4, it fills any empty position when a code needs a 7th character. The CDC ICD-10-CM browser tool shows V43.73 has only five characters, so omitting the X produces an invalid code that clearinghouses reject.

What V43.73XA covers and what it excludes

The scope of V43.73XA is narrow, so checking it against the record prevents reporting it where a sibling code applies.

What it covers

• A person riding on the outside of a car, such as on the bumper, roof, running board, step or bodywork
• A collision between that car and a pick-up truck
• A crash on a public highway, or one with no place stated, since ICD-10-CM assumes a public highway unless another place is specified
• The encounter where the injury is under active treatment

What it excludes

• Nontraffic collisions that happen entirely off the public highway (use V43.23XA)
• A driver or passenger inside the car (use V43.53XA or V43.63XA)
• A person boarding or alighting from the car (use V43.43XA)
• Collisions with an SUV, another type of car or a van (use V43.71XA, V43.72XA or V43.74XA)
• Collisions with a heavy transport vehicle or bus (category V44)
• Anyone riding in or on the pick-up truck itself (category V53)
• Follow-up and late-effect encounters (use V43.73XD or V43.73XS)

The 7th character: A vs D vs S

The 7th character tells the payer where the patient is in the course of treatment. External cause codes take the same 7th character as the injury code they accompany, so the two must agree on every claim.

A common mistake is using character A because it is the patient’s first visit with this provider. The character describes the treatment phase, not the provider relationship. A patient seen by a specialist three weeks after the accident for follow-up wound care takes character D.

V43.73XA vs related codes: Role, traffic status and vehicle

The V43 codes form a grid on three axes. The 4th character sets the injured person’s role and the traffic status, and the 5th character names the other vehicle. Misreading any one axis produces a code that describes a different accident. The diagram below asks the three questions in the order a coder should answer them.

Each end point in the diagram is a separate code with its own official title. The table lists them for the initial encounter.

The role axis causes most errors on this code. Notes rarely describe someone riding outside a car. A coder who reads “outside” loosely can report a pedestrian or passenger injury as V43.73XA. The traffic axis works the other way: a missing location defaults to traffic, so V43.23XA needs a stated off-road place.

How to use V43.73XA: Sequencing and additional codes

V43.73XA is an external cause code. Under ICD-10-CM Official Guidelines Section I.C.20, an external cause code is never the principal or first-listed diagnosis. The injury is coded first.

Sequence the claim in this order:

1. Code the injury first with an S00-T88 code, such as S06.0X0A for a concussion without loss of consciousness. The injury code is the principal or first-listed diagnosis.
2. Add V43.73XA as the external cause in a secondary position. It explains how the injury happened, and it carries the same 7th character as the injury code.
3. Add the type of street or road from Y92.4-, which the tabular list asks for on transport accidents. Examples include Y92.410 (unspecified street and highway) and Y92.414 (local residential or business street).
4. Add any other codes the tabular list calls for where documented. These include W22.1 for an airbag injury and Y93.C- for phone or electronic device use at the time of the accident.
5. Add an external cause status code from Y99 where it applies, such as Y99.0 when the patient was working for pay. Place, activity and status codes go on the initial encounter only.

Documentation requirements for V43.73XA

Supporting V43.73XA through an audit requires the clinical record to answer four questions about the event. A missing answer gives payers and auditors grounds to deny or recoup the claim.

• Position on the outside of the car: The note should state where the patient was. “Riding on the rear bumper” or “standing on the running board” both qualify. “Occupant” or “MVA” alone does not support this code.
• Other vehicle is a pick-up truck: Generic terms like “truck” may not be specific enough. A van, SUV or heavy truck each changes the code.
• Public-road setting: The note should name the road or describe the crash as on a street or highway. That location also supports the Y92.4- place code.
• Encounter type supports character A: The plan of care should show active treatment at this visit, not routine follow-up.

When documentation is incomplete, query the clinician before the claim goes out rather than guessing at the role. Submitting a clean claim means every code is supported before it leaves the practice.

Common claim denial reasons for V43.73XA

External cause codes produce a predictable set of denial patterns. Each one has a fix at the documentation or coding stage, before the claim is submitted.

• External cause coded as the principal diagnosis: V43.73XA sits in position 1 on the claim. Move it to a secondary position and list the injury code first.
• Missing injury code: V43.73XA is submitted without an S00-T88 code. Code the injury first, since an external cause code has no meaning without it.
• Wrong encounter character: Character A appears on a follow-up visit. Review each encounter and switch to D for healing-phase visits.
• Role mismatch: The note places the patient inside the car. Query the clinician, then correct to V43.53XA for a driver or V43.63XA for a passenger.
• Traffic status mismatch: The note describes a crash on private property or another off-road place. Correct to V43.23XA, the nontraffic code for the same collision.
• Missing accident details: An auto liability payer asks for the accident report. Supply it, or add a clinician addendum that confirms the patient’s position and the crash location.

Recurring external cause denials usually trace back to the same missing fact in the note. Structured denial management workflows route each denial type to the right fix, so the documentation template gets corrected once.

Payer-specific guidance: Medicare, Medicaid, and commercial insurers

External cause reporting requirements vary by payer type. A correctly coded claim may still be handled differently depending on who is paying.

Medicare (CMS)

CMS has no national mandate requiring external cause codes on Medicare Part A or Part B claims. They are encouraged but not required for most Medicare submissions. Medicare Administrative Contractors (MACs) can set stricter local requirements, so confirm current policy for your jurisdiction.

Medicaid

State Medicaid programs vary. Some states require external cause codes on accident-related claims as a condition of payment, and others treat them as optional. Practices billing Medicaid for motor vehicle injuries should check current state policy before assuming the code is optional.

Commercial insurers and auto liability

Commercial health insurers increasingly expect external cause codes on accident claims, to coordinate benefits and identify subrogation opportunities. Auto liability insurers and workers’ compensation carriers usually want the full chain: injury code, external cause code, place of occurrence and status code.

Sending V43.73XA to an auto liability payer without the injury code and Y92.4- road code commonly delays payment. Understanding how medical billing fundamentals interact with payer rules helps practices set documentation standards before coding starts.

How Pabau keeps V43.73XA claims clean before they reach the payer

Errors on a V43.73XA claim usually start before coding. The note says “MVA”, the coder guesses the patient’s role, and the claim goes out with the wrong 4th character.

Pabau’s claims tools for coders scrub every claim for missing or invalid details before it leaves the practice. US practices then submit through Claim.MD, which also runs eligibility checks before the visit.

When a claim is rejected, Pabau marks it “Needs action” and links your team to the field that needs correcting. The coder fixes the code pairing once, and the claims dashboard shows when it moves to paid.

Catch external cause coding errors before submission

Pabau’s claims management software scrubs each claim for missing or invalid details before it reaches Claim.MD. Rejected claims land in a Needs action queue that points to the field to fix.

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Conclusion

V43.73XA belongs on a claim only when the record answers three questions. Was the patient riding on the outside of the car? Was the other vehicle a pick-up truck? Did the crash happen on a public road?

Build those three prompts into your accident intake template, and the choice between V43.73XA, V43.23XA and V43.63XA stops being a judgment call. Leave them out, and every vague “MVA” note becomes a coder query or a denial.

Book a demo to see how Pabau scrubs external cause claims before they reach the payer.

Continue your research

Need to understand how clearinghouse validation works? Understanding the Claim.MD clearinghouse explains how real-time claim edits catch sequencing errors before payer submission.

Seeing recurring denials across your practice? Denial management in healthcare covers structured workflows for routing and resolving denial patterns by code category.

Want to understand how external cause codes fit into billing? What is medical billing covers the end-to-end process from encounter documentation through payment posting.

Coding the same rider hit by an SUV? ICD-10 code V43.71XA covers a person on the outside of a car in a traffic collision with a sport utility vehicle.

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