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ICD-10-CM 2027 diagnosis code

Z04Encounter for examination and observation for other reasons

Not billable — use a more specific code

Z04 is a header code, so it can't be reported by itself. Choose one of the 8 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z04

Z04 is the ICD-10-CM diagnosis code for encounter for examination and observation for other reasons. It belongs to block Z00-Z13 (persons encountering health services for examinations) and chapter 21 (factors influencing health status and contact with health services). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z04.1 (accident), Z04.2 (accident), Z04.3 (accident), Z04.4 (rape), Z04.6 (authority), Z04.7 (abuse), Z04.8 (reasons) and Z04.9 (reason).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Z04

Coding notes

IncludesFurther defines the content of the category
  • encounter for examination for medicolegal reasons
  • This category is to be used when a person without a diagnosis is suspected of having an abnormal condition, without signs or symptoms, which requires study, but after examination and observation, is ruled-out. This category is also for use for administrative and legal observation status.

Notes that apply from higher levels

Instructions written at a parent level also apply to Z04.

Broader instructions also apply from Z00-Z13 Persons encountering health services for examinations and Chapter 21: Factors influencing health status and contact with health services.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Z04

Is Z04 billable?

No. Z04 is a header code. Report one of its more specific subcodes instead.