Billable / Specific Code
ICD-10-CM Z21 is the diagnosis code for Asymptomatic human immunodeficiency virus [HIV] infection status. This code falls under the section "Persons with potential health hazards related to communicable diseases" within Chapter 21 — Factors influencing health status and contact with health services (Z00-Z99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as Z21. They are mutually exclusive:
Understanding where Z21 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, Z21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Z21 is the ICD-10-CM diagnosis code for "Asymptomatic human immunodeficiency virus [HIV] infection status". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
Z21 is located in Section Z20-Z29 — "Persons with potential health hazards related to communicable diseases" within Chapter 21 of the ICD-10-CM Tabular List.
Use Z21 when the patients documented diagnosis matches "Asymptomatic human immunodeficiency virus [HIV] infection status" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Asymptomatic human immunodeficiency virus [HIV] infection status is Z21.
Yes, Z21 can be used as a primary diagnosis code since it is billable and specific.
Z21 is in Chapter 21 of the ICD-10-CM Tabular List.
Type 1 Excludes for Z21 include: acquired immunodeficiency syndrome (B20); contact with human immunodeficiency virus [HIV] (Z20.6); exposure to human immunodeficiency virus [HIV] (Z20.6) and more.
Yes, Z21 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.