2026 ICD-10-CM Diagnosis Code Z04.3Encounter for examination and observation following other accident

ICD-10-CM Codes›Z00–Z99›Z00-Z13›Z04

ICD-10-CM Z04.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z04.3 is a billable ICD-10-CM diagnosis code for encounter for examination and observation following other accident. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders).

Code Identity

ICD-10-CM Code
Z04.3
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for examination and observation following other accident
Short Description
Encounter for exam and observation following oth accident
Parent Code
Z04
Encounter for examination and observation for other reasons

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ00-Z13Persons encountering health services for examinations
CategoryZ04Encounter for examination and observation for other reasons
This CodeZ04.3Encounter for examination and observation following other accident

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accident caused by blizzard
  • Accident caused by brief heavy rainfall
  • Accident caused by collapse of dam
  • Accident caused by continuing torrential rain
  • Accident caused by cyclone
  • Accident caused by earth surface movement
  • Accident caused by electric cooker in private dwelling
  • Accident caused by electric wiring or appliance
  • Accident caused by electric wiring or appliance in public building
  • Accident caused by electric wiring or appliance in residential institution
  • Accident caused by electric wiring or appliance in school
  • Accident caused by electric wiring or appliance outdoors
  • Accident caused by high wind
  • Accident caused by hurricane
  • Accident caused by landslide
  • Accident caused by movement of earth's crust
  • Accident caused by mud slide
  • Accident caused by rainfall
  • Accident caused by rockfall
  • Accident caused by snow avalanche
  • Accident caused by storms and floods resulting from storms
  • Accident caused by surface earth or water movement
  • Accident caused by tidal wave
  • Accident caused by tidal wave storm
  • Accident due to abandonment of child
  • Accident due to abandonment of disabled person
  • Accident due to abandonment of elderly person
  • Accident due to abandonment of newborn
  • Accident due to abandonment or neglect of helpless person
  • Accident due to animal or plant
  • Accident due to cold of man-made origin
  • Accident due to cold weather
  • Accident due to destitution
  • Accident due to dry ice
  • Accident due to environmental factor
  • Accident due to excessive cold
  • Accident due to exposure to excessive humidity
  • Accident due to exposure to humidity
  • Accident due to high air pressure from rapid descent in water
  • Accident due to high air pressure from rapid descent in water while diving
  • Accident due to high or low air pressure or changes in air pressure due to diving
  • Accident due to high pressure in diving
  • Accident due to hunger, thirst, exposure and neglect
  • Accident due to lack of food
  • Accident due to liquid air
  • Accident due to liquid hydrogen
  • Accident due to liquid nitrogen
  • Accident due to liquid oxygen
  • Accident due to mass gathering event
  • Accident due to neglect of child
  • Accident due to neglect of disabled person
  • Accident due to neglect of elderly person
  • Accident due to pressure changes in diving
  • Accident due to privation, unqualified
  • Accident due to reduction air pressure - ascent from diving
  • Accident due to reduction in atmospheric pressure, surfacing from underground
  • Accident due to refrigerator
  • Accident due to striking by hailstones
  • Accident due to sudden air pressure change, aircraft diving
  • Accident due to sudden change in air pressure in aircraft
  • Accident due to sudden loss of aircraft cabin pressure
  • Accident while engaged in household activity
  • Accidents due to travel and motion
  • Transport vehicle washed off road by storm

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Examination(for) (following) (general) (of) (routine)
      • following
        • accident NEC
    • Observation(following) (for) (without need for further medical care)
      • accident NEC

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC003
Encounter for observation and examination for conditions ruled out (excludes infectious disease, neoplasm, mental disorders)
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert Z04.3 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V71.4 Observ-accident NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z04.3Overview

Is Z04.3 (Encounter for examination and observation for other reasons) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for examination and observation following other accident on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Z04.3 group to?

When encounter for examination and observation following other accident is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of Z04.3?

Under the General Equivalence Mappings, encounter for examination and observation following other accident converts to ICD-9-CM V71.4 (observ-accident NEC). The mapping is approximate, so confirm the match fits the documentation.