Z04 – Encounter for examination and observation for other reasons
ICD-10-CM 2027 diagnosis code · Persons encountering health services for examinations
ICD-10-CM code
Z04
- Code
Z04(claims format:Z04)- Description
- Encounter for examination and observation for other reasons
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 21. Factors influencing health status and contact with health services (Z00-Z99)
- Block
- Z00-Z13 Persons encountering health services for examinations
Billable codes under Z04
Z04 is a header code and cannot be used on claims. Choose the most specific code:
- Z04.1 – Encounter for examination and observation following transport accidentBillable
- Z04.2 – Encounter for examination and observation following work accidentBillable
- Z04.3 – Encounter for examination and observation following other accidentBillable
- Z04.4 – Encounter for examination and observation following alleged rapeHeader (more codes below)
- Z04.6 – Encounter for general psychiatric examination, requested by authorityBillable
- Z04.7 – Encounter for examination and observation following alleged physical abuseHeader (more codes below)
- Z04.8 – Encounter for examination and observation for other specified reasonsHeader (more codes below)
- Z04.9 – Encounter for examination and observation for unspecified reasonBillable
Notes for Z04
Includes:
- 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 inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Block Z00-Z13
Notes:
- Nonspecific abnormal findings disclosed at the time of these examinations are classified to categories R70-R94.
Frequently asked questions
What is ICD-10 code Z04?
Z04 is the ICD-10-CM code for encounter for examination and observation for other reasons, in the block Z00-Z13 (Persons encountering health services for examinations).
Is Z04 a billable code?
No. Z04 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.