Use B20- Human immunodeficiency virus [HIV] disease, when the patient is symptomatic. You would need to code all manifestations of the HIV infection as a secondary code. Once a patient has developed an HIV-related illness, the patient should always be assigned B20 on every visit thereafter.
Report a status code Z21 if the patient is HIV Postive but asymptomatic, do not use this code if the patient has ever had any HIV-related illness, DO NOT use this code if the term AIDS is used. Report Z21 after the reason for the encounter, not as a principal or first-listed diagnosis.,
Z21 Asymptomatic human immunodeficiency virus [HIV] infection status, HIV positive NOS.
B97.35 - Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere, B97.35 is used to supplement the infectious agent and to be used in addition to the identifying the infection.