Z21
Asymptomatic human immunodeficiency virus [HIV] infection status
Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 5 never code together
Z21code
Excludes1
- acquired immunodeficiency syndrome (B20)B20B20B20
- contact with human immunodeficiency virus [HIV] (Z20.6)Z20.6Z20.6Z20.6
- exposure to human immunodeficiency virus [HIV] (Z20.6)Z20.6Z20.6Z20.6
- human immunodeficiency virus [HIV] disease (B20)B20B20B20
- inconclusive laboratory evidence of human immunodeficiency virus [HIV] (R75)R75R75R75
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Instructional notes 5
Z21code
Z00-Z99chapter
Notes
- Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:Z00-Z99A00-Y89
- (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
- (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Index entries leading here 5
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.