B20
Human immunodeficiency virus [HIV] disease
B20 is a billable ICD-10-CM diagnosis code for human immunodeficiency virus [HIV] disease. It is part of the FY2027 code set, effective October 1, 2026. The Alphabetic Index lists it under 15 entries. Its coding notes include a Code first instruction, a Use additional code instruction, 3 Excludes1 entries and 5 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Only confirmed HIV is coded, and the provider's statement is enough. B20 is assigned for AIDS, HIV disease, or any HIV-related illness.
Code first
If the underlying condition listed here is present and known, sequence it first.
- Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
Use additional code
Add the listed code as a secondary code, if known.
- code(s) to identify all manifestations of HIV infection
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (5 notes)
- carrier or suspected carrier of infectious disease (Z22.-)
- certain localized infections - see body system-related chapters
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
- infectious and parasitic diseases specific to the perinatal period (P35-P39)
- influenza and other acute respiratory infections (J00-J22)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 5 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIncludes
Further defines or gives examples of the content of the category.
- acquired immune deficiency syndrome [AIDS]
- AIDS-related complex [ARC]
- HIV infection, symptomatic
Also from chapter/block level (1 note)
- diseases generally recognized as communicable or transmissible
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 15 entries
- Acquired, immunodeficiency syndrome (AIDS)
- AIDS (related complex)
- ARC (AIDS-related complex)
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety), in (due to), human immunodeficiency virus (HIV) disease
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety), in (due to), human immunodeficiency virus (HIV) disease, with behavioral disturbance
- Disease, diseased, human immunodeficiency virus (HIV)
- Disease, diseased, slim (HIV)
- Disease, diseased, viral, virus, human immunodeficiency (HIV)
- Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute), due to, human immunodeficiency virus (HIV) disease
- HIV
- Human, immunodeficiency virus (HIV) disease (infection)
- Human, immunodeficiency virus (HIV) disease (infection), dementia