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Z21 ICD-10-CA code: Asymptomatic human immunodeficiency virus [HIV] infection status

Z21 is the ICD-10-CA code for “Asymptomatic human immunodeficiency virus [HIV] infection status” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

Z21

Asymptomatic human immunodeficiency virus [HIV] infection status

Short description: Asymptomatic HIV infection status

ICD-10-CA · Canada

Index terms

Entries in CIHI’s alphabetical index that lead to Z21. Searching the index by the condition the note names is how coders reach this code.

  • Test(s), HIV (human immunodeficiency virus), positive, asymptomatic
  • Status (post), human immunodeficiency virus (HIV) infection, asymptomatic
  • Human, immunodeficiency virus (HIV) disease (infection), asymptomatic status

Notes for Z21

As CIHI prints them, with any note Z21 takes from the headings above it.

Includes

  • HIV positive NOS

Excludes

Conditions classified elsewhere.

  • Contact with or exposure to human immunodeficiency virus [HIV] (Z20.6)human immunodeficiency virus [HIV] disease (B24)human immunodeficiency virus [HIV] disease complicating pregnancy, chilbirth and the puerperium (O98.7-)laboratory evidence of human immunodeficiency virus [HIV] (R75)

Note

  • This chapter should not be used for international comparison or for primary mortality coding.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:(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 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. Such factors may be elicited during population surveys, when the person may or may not be currently sick, or be recorded as an additional factor to be borne in mind when the person is receiving care for some illness or injury.From Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

Where Z21 sits

  1. 1ChapterChapter 21: Factors influencing health status and contact with health services (Z00-Z99)
  2. 2Block Z20-Z29Persons with potential health hazards related to communicable diseases
  3. 3Valid code Z21Asymptomatic human immunodeficiency virus [HIV] infection status

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See Z21 in the CIHI source

Frequently asked questions

What does ICD-10-CA code Z21 mean?

Z21 is the ICD-10-CA code for “Asymptomatic human immunodeficiency virus [HIV] infection status” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is Z21 in ICD-10-CA?

Z21 sits under Z20-Z29 Persons with potential health hazards related to communicable diseases, within Chapter 21: Factors influencing health status and contact with health services (Z00-Z99).

What coding notes apply to Z21?

ICD-10-CA lists Includes, Excludes, Note notes for Z21, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside Z21

Z20Contact with and exposure to communicable diseasesZ22Carrier of infectious diseaseZ23Need for immunization against single bacterial diseasesZ24Need for immunization against certain single viral diseasesZ25Need for immunization against other single viral diseasesZ26Need for immunization against other single infectious diseasesZ27Need for immunization against combinations of infectious diseasesZ28Immunization not carried outZ29Need for other prophylactic measures