2024 ICD-10-CM Diagnosis Code Z04.9

Encounter for examination and observation for unspecified reason

• Z04.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• Short description: Encounter for examination and observation for unsp reason
• The 2024 edition of ICD-10-CM Z04.9 became effective on October 1, 2023.
• This is the American ICD-10-CM version of Z04.9 – other international versions of ICD-10 Z04.9 may differ.

Applicable To

• Encounter for observation NOS

The following code(s) above Z04.9 contain annotation back-references

 that may be applicable to Z04.9:

• Z00-Z99  Factors influencing health status and contact with health services
• Z00-Z13  Persons encountering health services for examinations
• Z04  Encounter for examination and observation for other reasons

ICD-10-CM Z04.9 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

• 951 Other factors influencing health status

Convert Z04.9 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change

Diagnosis Index entries containing back-references to Z04.9:

• Investigation Z04.9 – see also Examination
• Observation (following) (for) (without need for further medical care) Z04.9