Z04.1 Encounter for examination and observation following transport accident
The ICD-10-CM code for Encounter for examination and observation following transport accident is Z04.1 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- Z00-Z13: Persons encountering health services for examinations (Z00-Z13)
- Category Z04
- 16 codes (12 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to Z04.1:
- Observation (following) (for) (without need for further medical care) › accident NEC › transport
- Examination (for) (following) (general) (of) (routine) › following › motor vehicle accident
- Examination (for) (following) (general) (of) (routine) › following › accident NEC › transport
U.S. Hospital Utilization
- An estimated 600 U.S. inpatient stays in 2023 included Z04.1 among the documented diagnoses.
- 335 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Used with any code in range A00.0-T88.9, Z00-Z991) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.
Additional codes with observation code (fragment)observation code, but only if they are unrelated to the suspected condition being observed.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026