Contact w and (suspected) exposure to human immunodef virus

This code signifies that an individual has had contact with or is suspected of having been exposed to the human immunodeficiency virus (HIV). It indicates a potential exposure event, but not a confirmed infection or asymptomatic carrier status.

Use this code when a patient presents for evaluation following a known or suspected exposure to HIV, such as a needlestick injury, unprotected sexual contact with an HIV-positive individual, or perinatal exposure. It is appropriate for situations where the patient's HIV status is unknown or has not yet been confirmed.

• Do not use this code if the patient is known to be HIV positive (use Z21 for asymptomatic HIV infection status or codes from B20 for symptomatic HIV disease).
• This code is often used in conjunction with codes for the reason for the encounter, such as screening for infectious disease or follow-up care.
• Ensure documentation clearly supports a suspected exposure rather than a confirmed infection or asymptomatic carrier state.