ICD-10 Code Z21: Asymptomatic human immunodeficiency virus [HIV] infection status
Z21 is a billable ICD-10 diagnosis code used to classify Asymptomatic human immunodeficiency virus [HIV] infection status in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Factors influencing health status and contact with health services (Z00-Z99).
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Factors influencing health status and contact with health services (Z00-Z99).
When is it used?
- May be used when a clinician documents asymptomatic human immunodeficiency virus [hiv] infection status in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
Official coding notes
- HIV positive NOS
- Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
- acquired immunodeficiency syndrome (B20)
- contact with human immunodeficiency virus [HIV] (Z20.6)
- exposure to human immunodeficiency virus [HIV] (Z20.6)
- human immunodeficiency virus [HIV] disease (B20)
- inconclusive laboratory evidence of human immunodeficiency virus [HIV] (R75)
- Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
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Coverage-related procedures and services
Mapped diagnoses and classifications
Coding guidelines
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Common synonyms
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About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.