ICD-10-CM 2027
ICD-10 code for immunity status test
From the official ICD-10-CM alphabetic index entry “Test, tests, testing (for) › immunity status”. Page updated September 29, 2026.
About coding immunity status test
The ICD-10-CM code for immunity status test is Z01.84 (Encounter for antibody response examination).
Within Z01.8 (encounter for other specified special examinations), Z01.84 is specifically for encounter for antibody response examination. Related codes cover preprocedural examinations (Z01.81), allergy testing (Z01.82), blood typing (Z01.83) and other specified special examinations (Z01.89).
Don't report Z01.84 together with the conditions in its Excludes1 note: encounter for allergy testing (Z01.82).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for Z01.84)
- encounter for allergy testing (Z01.82)
Common questions about immunity status test ICD-10 codes
What is the ICD-10 code for immunity status test?
- Z01.84 — Encounter for antibody response examination.
Is Z01.84 billable?
- Yes. Z01.84 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z01.84 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z01.84 a CC or MCC?
- No. Z01.84 is neither a CC nor an MCC under MS-DRG v44.0.