2026 ICD-10-CM Diagnosis Code Z01.84Encounter for antibody response examination
Z01.84 is a billable ICD-10-CM diagnosis code for encounter for antibody response examination. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. Coders also document this condition as rhesus antibody absent. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Medical examination/evaluation.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z01.84.
Present on Admission (POA)Billing
Z01.84 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Rhesus antibody absent
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Encounter for immunity status testing
Type 1 Excludes
- encounter for allergy testing Z01.82
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Examination (for) (following) (general) (of) (routine) - Z00.00
- antibody response - Z01.84
- immunity status testing - Z01.84
- immunity status - Z01.84
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Examination(for) (following) (general) (of) (routine)
- antibody response
- Examination(for) (following) (general) (of) (routine)
- immunity status testing
- Test, tests, testing(for)
- immunity status
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert Z01.84 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z01.84Overview
Is Z01.84 (Encounter for other specified special examinations) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report encounter for antibody response examination on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Can Z01.84 be a principal diagnosis?
No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for antibody response examination describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.
Is Z01.84 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for encounter for antibody response examination on inpatient claims.
What is the ICD-9 equivalent of Z01.84?
Under the General Equivalence Mappings, encounter for antibody response examination converts to ICD-9-CM V72.61 (antibody response exam). The mapping is a direct match.
