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  3. A00–B99
  4. B20
  5. Human immunodeficiency virus [HIV] disease (B20)

Human immunodeficiency virus [HIV] disease (B20)

ICD-10 code B20 is assigned to cases of Human immunodeficiency virus (HIV) disease, covering a wide spectrum of HIV-related health conditions. This includes the initial infection, symptomatic HIV stages, and complications arising from HIV infection or acquired immunodeficiency syndrome (AIDS).

This code encompasses conditions such as acute HIV infection, asymptomatic HIV, and AIDS with its many associated opportunistic infections and related disorders. Synonyms like "Acquired immune deficiency syndrome (AIDS)" and "Primary HIV infection" help clarify when to apply B20. It also addresses HIV complications affecting multiple organ systems, including neurological disorders, malignancies like lymphoma and Kaposi's sarcoma, respiratory infections like pneumocystosis, and various skin conditions. The code is used for HIV disease manifestations in adults and children, including HIV complicating pregnancy and childbirth. Given its scope, B20 helps healthcare providers and coders document the complex range of illnesses caused by HIV, ensuring precise tracking of the infection and its systemic impact for treatment and reporting purposes.

Instructional Notations

Includes

This note appears immediately under a three character code title to further define, or give examples of, the content of the category.

  • acquired immune deficiency syndrome [AIDS]
  • AIDS-related complex [ARC]
  • HIV infection, symptomatic

Code First

Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

  • Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable O98.7

Use Additional Code

The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

  • code(s) to identify all manifestations of HIV infection

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • asymptomatic human immunodeficiency virus [HIV] infection status Z21
  • exposure to HIV virus Z20.6
  • inconclusive serologic evidence of HIV R75

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Agranulocytosis

A decrease in the number of GRANULOCYTES; (BASOPHILS; EOSINOPHILS; and NEUTROPHILS).

Cachexia

General ill health, malnutrition, and weight loss, usually associated with chronic disease.

Failure to Thrive

A condition of substandard growth or diminished capacity to maintain normal function.

Feline Panleukopenia

A highly contagious DNA virus infection of the cat family, characterized by fever, enteritis and bone marrow changes. It is also called feline ataxia, feline agranulocytosis, feline infectious enteritis, cat fever, cat plague, and show fever. It is caused by FELINE PANLEUKOPENIA VIRUS or the closely related MINK ENTERITIS VIRUS or CANINE PARVOVIRUS.

Isospora

A genus of protozoan parasites found in the intestines of birds, amphibians, reptiles, and mammals, including man. The oocysts produce two sporocysts, each with four sporozoites. Many species are parasitic in wild and domestic animals.

Isosporiasis

Infection with parasitic protozoa of the genus ISOSPORA, producing intestinal disease. It is caused by ingestion of oocysts and can produce tissue cysts.

Pityriasis Rubra Pilaris

A chronic skin disease characterized by small follicular papules, disseminated reddish-brown scaly patches, and often, palmoplantar hyperkeratosis. The papules are about the size of a pin and topped by a horny plug.