ICD-10-CM Code Z21

Asymptomatic human immunodeficiency virus [HIV] infection status

Version 2020 Billable Code Questionable Admission Codes

Valid for Submission

Z21 is a billable code used to specify a medical diagnosis of asymptomatic human immunodeficiency virus [hiv] infection status. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Z21 might also be used to specify conditions or terms like asymptomatic human immunodeficiency virus a1 infection, asymptomatic human immunodeficiency virus a2 infection, asymptomatic human immunodeficiency virus infection, asymptomatic human immunodeficiency virus infection, asymptomatic human immunodeficiency virus infection in pregnancy, finding of hiv status, etc

The code Z21 is not usually sufficient justification for admission to an acute care hospital when used as a principal diagnosis.

ICD-10:Z21
Short Description:Asymptomatic human immunodeficiency virus infection status
Long Description:Asymptomatic human immunodeficiency virus [HIV] infection status

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code Z21:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • HIV positive NOS

Code First

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

Type 1 Excludes

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.
  • acquired immunodeficiency syndrome B20
  • contact with human immunodeficiency virus HIV Z20.6
  • exposure to human immunodeficiency virus HIV Z20.6
  • human immunodeficiency virus HIV disease B20
  • inconclusive laboratory evidence of human immunodeficiency virus HIV R75

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Z21 are found in the index:


Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

  • Questionable admission codes - Some diagnoses are not usually sufficient justification for admission to an acute care hospital. For example, if a patient is given code R030 for elevated blood pressure reading, without diagnosis of hypertension, then the patient would have a questionable admission, since elevated blood pressure reading is not normally sufficient justification for admission to a hospital.

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Asymptomatic human immunodeficiency virus A1 infection
  • Asymptomatic human immunodeficiency virus A2 infection
  • Asymptomatic human immunodeficiency virus infection
  • Asymptomatic human immunodeficiency virus infection
  • Asymptomatic human immunodeficiency virus infection in pregnancy
  • Finding of HIV status
  • History of asymptomatic human immunodeficiency virus infection
  • HIV positive
  • Human immunodeficiency virus 2 antibody positive and Human immunodeficiency virus 1 antibody cross-reactivity
  • Human immunodeficiency virus antibody positive
  • Human immunodeficiency virus antibody titer - finding
  • Human immunodeficiency virus carrier
  • Human immunodeficiency virus complicating pregnancy childbirth and the puerperium
  • Human immunodeficiency virus enzyme-linked immunosorbent assay test positive
  • Increased human immunodeficiency virus viral load

Diagnostic Related Groups

The ICD-10 code Z21 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2020 through 09/30/2020.

  • 865 - VIRAL ILLNESS WITH MCC
  • 866 - VIRAL ILLNESS WITHOUT MCC

Convert Z21 to ICD-9

  • V08 - Asymp hiv infectn status

Code Classification

  • Factors influencing health status and contact with health services (Z00–Z99)
    • Persons with potential health hazards related to communicable diseases (Z20-Z29)
      • Asymptomatic human immunodeficiency virus infection status (Z21)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


HIV/AIDS

HIV stands for human immunodeficiency virus. It harms your immune system by destroying the white blood cells that fight infection. This puts you at risk for serious infections and certain cancers. AIDS stands for acquired immunodeficiency syndrome. It is the final stage of infection with HIV. Not everyone with HIV develops AIDS.

HIV most often spreads through unprotected sex with a person who has HIV. It may also spread by sharing drug needles or through contact with the blood of a person who has HIV. Women can give it to their babies during pregnancy or childbirth.

The first signs of HIV infection may be swollen glands and flu-like symptoms. These may come and go within two to four weeks. Severe symptoms may not appear until months or years later.

A blood test can tell if you have HIV infection. Your health care provider can do the test, or you can use a home testing kit. Or to find free testing sites, call the national referral hotline at 1-800-CDC-INFO (1-800-232-4636 in English and en español; 1-888-232-6348 - TTY).

There is no cure, but there are many medicines that fight HIV infection and lower the risk of infecting others. People who get early treatment can live with the disease for a long time.

Strategies to reduce the risk of HIV infection include not having sex, limiting your number of sexual partners, never sharing needles, and using condoms the right way every time you have sex. People who are at high risk may take HIV prevention medicines.


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