Z01.84 Encounter for antibody response examination
The ICD-10-CM code for Encounter for antibody response examination is Z01.84 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- Z00-Z13: Persons encountering health services for examinations (Z00-Z13)
- Category Z01
- 34 codes (23 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to Z01.84:
- Examination (for) (following) (general) (of) (routine) › immunity status testing
- Examination (for) (following) (general) (of) (routine) › antibody response
- Test, tests, testing (for) › immunity status
Inclusion Terms
- Encounter for immunity status testing
U.S. Hospital Utilization
- An estimated 1,540 U.S. inpatient stays in 2023 included Z01.84 among the documented diagnoses.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Antibody testing (not confirm current or follow-up): assign Z01.84(k) Encounter for antibody testing For an encounter for antibody testing that is not being performed to confirm a current COVID-19 infection, nor is a follow-up test after resolution of COVID-19, assign Z01.84, Encounter for antibody response examination.
Used with any code in range A00.0-T88.9, Z00-Z991) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026