Z21

ICD-10Billable

Asymptomatic human immunodeficiency virus infection status

Official ICD-10-CM descriptor (FY2026)

Asymptomatic human immunodeficiency virus [HIV] infection status

Z21 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • HIV positive NOS

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • 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)

Code first

Sequence the underlying condition before this code.

  • Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)

Where this code sits

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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