Is Z21 a billable code?
Yes. Z21 is a billable ICD-10-CM code and can be used on claims and superbills for dates of service from October 1, 2026 to September 30, 2027.
ICD-10-CM FY2027 diagnosis code
Z21: Asymptomatic human immunodeficiency virus [HIV] infection status
Billable codeValid for dates of service October 1, 2026 to September 30, 2027
Z21 is a billable ICD-10-CM diagnosis code for asymptomatic human immunodeficiency virus [hiv] infection status. It is specific enough to use on an insurance claim, a superbill or a Good Faith Estimate.
Superbill GeneratorStart a superbill with Z21 already added.Good Faith EstimateStart a cost estimate with Z21 already added.CMS-1500 Claim FormFill a claim form with Z21 in box 21.
Z21 questions
What does Z21 mean?
Z21 is the ICD-10-CM code for Asymptomatic human immunodeficiency virus [HIV] infection status. It is in chapter 22, Factors influencing health status and contact with health services (Z00-Z99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.