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ICD-10-CM 2027 diagnosis code

Z03Encounter for medical observation for suspected diseases and conditions ruled out

Not billable — use a more specific code

Z03 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.Short description: Encntr for medical obs for susp diseases and cond ruled out

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 Z03

Z03 is the ICD-10-CM diagnosis code for encounter for medical observation for suspected diseases and conditions ruled out. 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 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Z03.6 (out), Z03.7 (out) and Z03.8 (out).

Don't report Z03 together with the conditions in its Excludes1 note: contact with and (suspected) exposures hazardous to health (Z77.-), encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out (Z05.-), person with feared complaint in whom no diagnosis is made (Z71.1) and signs or symptoms under study- code to signs or symptoms.

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 Z03

Coding notes

Applicable toConditions and synonyms classified to this code
  • 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.
Excludes1Not coded here — never report together with this code
  • contact with and (suspected) exposures hazardous to health (Z77.-)
  • encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out (Z05.-)
  • person with feared complaint in whom no diagnosis is made (Z71.1)
  • signs or symptoms under study- code to signs or symptoms

Notes that apply from higher levels

Instructions written at a parent level also apply to Z03.

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.

Codes whose notes reference Z03

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 Z03

Is Z03 billable?

No. Z03 is a header code. Report one of its more specific subcodes instead.