B20

HCC Category Mapping

What This Code Means

This code represents a diagnosis of HIV (human immunodeficiency virus) disease, which is a viral infection that attacks the immune system and can progress to AIDS if untreated. It is used to document that a patient has been diagnosed with HIV infection.

Coding Tips

• •B20 is the parent code for HIV disease; always use a more specific code from the B20 subcategories that indicates the stage of disease or associated conditions (such as B20.0 for HIV with mycobacterial infection, B20.1 for HIV with other bacterial infections, etc.)
• •Do not use B20 alone in current coding practice; verify that a fifth character or additional specificity is documented regarding opportunistic infections, CD4 count status, or other HIV-related conditions to ensure accurate and complete coding

Clinical Significance

Human immunodeficiency virus disease is one of the most significant codes in risk adjustment, carrying its own dedicated HCC category (HCC 1) across all models. HIV disease requires lifelong antiretroviral therapy and monitoring, with substantial healthcare resource utilization. Accurate annual capture is essential as it must be reported each calendar year.

Documentation Requirements

• ✓Confirmed HIV diagnosis (positive HIV-1/2 antibody/antigen combination test with confirmatory testing)
• ✓CD4 count and viral load (HIV RNA quantitative) from current year
• ✓Current antiretroviral therapy regimen documented
• ✓Associated conditions: opportunistic infections, AIDS-defining illnesses
• ✓Provider assessment and plan addressing HIV management in current encounter

Commonly Confused Codes