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B20 ICD-10-CM Code: Human immunodeficiency virus [HIV] disease

Compare with another code for B20Check this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Official instructions
3 inclusion terms · 3 Excludes1 · 1 use-additional instruction · 1 code-first instruction
Risk adjustment
CMS-HCC V28: 1 category · CMS-HCC V22 category 1 · RxHCC V08 category 1

What these terms mean →

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Code firstSequence the underlying condition before this code
  • Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium, if applicable (O98.7-)
Use additional codeReport with this code when documented
  • Use additional code(s) to identify all manifestations of HIV infection
Excludes1Not reported with this code unless documented as unrelated
  • asymptomatic human immunodeficiency virus [HIV] infection status (Z21)
  • exposure to HIV virus (Z20.6)
  • inconclusive serologic evidence of HIV (R75)
IncludesWhat this code covers
  • acquired immune deficiency syndrome [AIDS]
  • AIDS-related complex [ARC]
  • HIV infection, symptomatic

Where it sits Source: CMS/NCHS

Under:Chapter 1: Certain Infectious and Parasitic Diseases

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 969 — HIV WITH EXTENSIVE O.R. PROCEDURES WITH MCC (MDC 25)
  • MS-DRG 970 — HIV WITH EXTENSIVE O.R. PROCEDURES WITHOUT MCC (MDC 25)
  • MS-DRG 974 — HIV WITH MAJOR RELATED CONDITION WITH MCC (MDC 25)
  • MS-DRG 975 — HIV WITH MAJOR RELATED CONDITION WITH CC (MDC 25)
  • MS-DRG 976 — HIV WITH MAJOR RELATED CONDITION WITHOUT CC/MCC (MDC 25)
  • MS-DRG 977 — HIV WITH OR WITHOUT OTHER RELATED CONDITION (MDC 25)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Risk Adjustment (CMS-HCC)

Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.

  • HCC 1 — HIV/AIDS

Other models: CMS-HCC V22 HCC 1 · RxHCC V08 HCC 1

Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for B20 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

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

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Code First

Underlying conditions that must be sequenced before this code.

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

Use Additional Code

Supplementary codes the tabular list directs you to add.

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

Coder workflow for B20

MedCoder structured workflow — derived from this code’s own official record

Before you code B20

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with B20. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in B20’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewZ21, Z20.6, R75

  2. Is the underlying (etiologic) condition the Code First note names documented?
    Yes → Sequence the underlying condition first, then B20.
    No → Continue; do not add an underlying condition the record does not document.

    ReviewO98.7

Consider B20. Then work the Use Additional Code note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The underlying (etiologic) condition
Named in the Code First note; sequenced before this code when documented (Guidelines I.A.13).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

Official instructions as workflow

  • Excludes1 — check before selecting B20(3 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with B20: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareZ21, Z20.6, R75

    See the official tabular notes · Guidelines I.A.12.a

  • Code First — sequencing check(1 note)

    Coding workflow: Check whether the underlying or etiologic condition the note names is documented. When it is, sequence it before B20. Do not add an underlying condition the record does not document.

    ReviewO98.7

    See the official tabular notes · Guidelines I.A.13

  • Use Additional Code — after identifying B20(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with B20 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    See the official tabular notes · Guidelines I.A.13

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition B20 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewZ21, Z20.6, R75

Documentation: The underlying condition the Code First note names is documented alongside this condition.

Coding question: How are the two sequenced?

Path: Review the Code First note.

Reason: The underlying condition is sequenced first and the manifestation follows (Guidelines I.A.13).

ReviewO98.7

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with B20?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse B20 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of B20 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • Z21— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of asymptomatic human immunodeficiency virus [HIV] infection status moves the case to Z21; the two are not reported together unless documented as unrelated.

    Full comparison: B20 vs Z21 →

  • Z20.6— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of exposure to HIV virus moves the case to Z20.6; the two are not reported together unless documented as unrelated.

    Full comparison: B20 vs Z20.6 →

  • R75— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of inconclusive serologic evidence of HIV moves the case to R75; the two are not reported together unless documented as unrelated.

    Full comparison: B20 vs R75 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Human immunodeficiency virus [HIV] disease is a billable ICD-10-CM diagnosis code (B20).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(a) HIV disease If the term “AIDS” or “HIV disease” is documented or if the patient is treated for any HIV-related illness or is described as having any condition(s) resulting from the patient’s HIV positive status; code B20, Human immunodeficiency virus [HIV], should be assigned.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(b) Patient admitted for HIV-related condition If a patient is admitted for an HIV-related condition, the principal diagnosis should be B20, Human immunodeficiency virus [HIV] disease followed by additional diagnosis codes for all reported HIV-related conditions.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

An exception to this guideline is if the reason for admission is hemolytic-uremic syndrome associated with HIV disease. Assign code D59.31, Infection-associated hemolytic-uremic syndrome, followed by code B20, Human immunodeficiency virus [HIV] disease.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(c) Patient with HIV disease admitted for unrelated condition If a patient with HIV disease is admitted for an unrelated condition (such as a traumatic injury), the code for the unrelated condition (e.g., the nature of injury code) should be the principal diagnosis. Code B20 would be reported as a secondary diagnosis. Codes for other documented conditions should also be reported as secondary diagnoses.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(g) Previously diagnosed HIV-related illness Patients with documentation of a prior diagnosis of an HIV-related illness should be coded to B20. Once an HIV-related illness has developed, code B20 should always be assigned on every subsequent admission/encounter. Patients previously diagnosed with any HIV illness (B20) should never be assigned to R75, Inconclusive laboratory evidence of human immunodeficiency virus [HIV] or Z21, Asymptomatic human immunodeficiency virus [HIV] infection status.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(h) HIV Infection in Pregnancy, Childbirth and the Puerperium When a patient presents during pregnancy, childbirth or the puerperium with documented symptomatic HIV disease or an HIV related illness, assign a code from subcategory O98.7, Human immunodeficiency [HIV] disease complicating pregnancy, childbirth and the puerperium, followed by code B20 and additional code(s) for any HIV-related illness(es). Codes from Chapter 15 always take sequencing priority.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

(j) HIV disease or HIV positive status managed by antiretroviral medication If a patient with documented HIV disease, HIV-related illness or AIDS is currently managed on antiretroviral medications, assign code B20, Human immunodeficiency virus [HIV] disease.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. Sequencing: 1 Code First instruction — the underlying condition is sequenced before this code when present. See the Code First notes
  2. 1 Use Additional Code instruction — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  3. 3 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name B20 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 9 Excludes1 notes across 6 chapters: B97.3 — Retrovirus as the cause of diseases classified elsewhere, D61.81 — Pancytopenia, D84.81 — Immunodeficiency due to conditions classified elsewhere, D89.89 — Other specified disorders involving the immune mechanism, not elsewhere classified, I88 — Nonspecific lymphadenitis, L04 — Acute lymphadenitis, R62.5 — Other and unspecified lack of expected normal physiological development in childhood, R75 — Inconclusive laboratory evidence of human immunodeficiency virus [HIV], Z21 — Asymptomatic human immunodeficiency virus [HIV] infection status.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 28 Excludes2 notes across 3 chapters: A50 — Congenital syphilis, A50-A64 — Infections with a predominantly sexual mode of transmission (A50-A64), A51 — Early syphilis, A52 — Late syphilis, A53 — Other and unspecified syphilis, A54 — Gonococcal infection, A55 — Chlamydial lymphogranuloma (venereum), A56 — Other sexually transmitted chlamydial diseases, A57 — Chancroid, A58 — Granuloma inguinale, A59 — Trichomoniasis, A60 — Anogenital herpesviral [herpes simplex] infections, A63 — Other predominantly sexually transmitted diseases, not elsewhere classified, A64 — Unspecified sexually transmitted disease, D80 — Immunodeficiency with predominantly antibody defects, D80-D89 — Certain disorders involving the immune mechanism (D80-D89), D81 — Combined immunodeficiencies, D82 — Immunodeficiency associated with other major defects, D83 — Common variable immunodeficiency, D84 — Other immunodeficiencies, +8 more.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 7 Code First instructions across 6 chapters: B39 — Histoplasmosis, C46 — Kaposi's sarcoma, E88.14 — HIV-associated lipodystrophy, F02 — Dementia in other diseases classified elsewhere, F06.7 — Mild neurocognitive disorder due to known physiological condition, G05 — Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere, H67 — Otitis media in diseases classified elsewhere.

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 2 Use Additional Code instructions across 2 chapters: D59.31 — Infection-associated hemolytic-uremic syndrome, O98.7 — Human immunodeficiency virus [HIV] disease complicating pregnancy, childbirth and the puerperium.

These codes instruct coders to additionally report this code when it applies.

Referenced by 1 Code Also instruction: I27.21 — Secondary pulmonary arterial hypertension.

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 5 clinically related codes on its CMS exclusion list. Does not count toward severity when the stay groups to DRGs 974-976 (HIV with Major Related Condition).

Named in the grouper logic of 6 MS-DRGs: DRG 969 (MDC 25), DRG 970 (MDC 25), DRG 974 (MDC 25), DRG 975 (MDC 25), DRG 976 (MDC 25), DRG 977 (MDC 25).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):INF006 — HIV infection (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

B92 — Sequelae of leprosy, B94.2 — Sequelae of viral hepatitis, B94.8 — Sequelae of other specified infectious and parasitic diseases, B94.9 — Sequelae of unspecified infectious and parasitic disease

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (HIV/AIDS) for risk-adjusted payment.

B97.35 — Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere, Z21 — Asymptomatic human immunodeficiency virus [HIV] infection status

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (HIV infection).

B97.35 — Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere, E88.14 — HIV-associated lipodystrophy, O98.711 — Human immunodeficiency virus [HIV] disease complicating pregnancy, first trimester, O98.712 — Human immunodeficiency virus [HIV] disease complicating pregnancy, second trimester, O98.713 — Human immunodeficiency virus [HIV] disease complicating pregnancy, third trimester, O98.719 — Human immunodeficiency virus [HIV] disease complicating pregnancy, unspecified trimester, O98.72 — Human immunodeficiency virus [HIV] disease complicating childbirth, O98.73 — Human immunodeficiency virus [HIV] disease complicating the puerperium, Z21 — Asymptomatic human immunodeficiency virus [HIV] infection status

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Encephalitis”, “Human”, “Dementia”; these codes share that main term but sit in a different category of the Tabular List.

A87.2 — Lymphocytic choriomeningitis (lymphatica), A92.2 — Venezuelan equine fever (Venezuelan equine), B00.4 — Herpesviral encephalitis (herpesviral), B01.11 — Varicella encephalitis and encephalomyelitis (postvaricella), B02.0 — Zoster encephalitis (in, zoster), B05.0 — Measles complicated by encephalitis (postmeasles), B06.01 — Rubella encephalitis (in, rubella), B09 — Unspecified viral infection characterized by skin and mucous membrane lesions (postexanthematous NEC), B10.01 — Human herpesvirus 6 encephalitis (herpesviral, due to herpesvirus 6), B10.09 — Other human herpesvirus encephalitis (herpesviral, specified NEC), B25.8 — Other cytomegaloviral diseases (in, cytomegalovirus), B26.2 — Mumps encephalitis (in, mumps), B33.3 — Retrovirus infections, not elsewhere classified (T-cell lymphotropic virus, type-1infection), B45.1 — Cerebral cryptococcosis (Torula, torular), B56.9 — African trypanosomiasis, unspecified (in, trypanosomiasis, African), B57.42 — Meningoencephalitis in Chagas' disease (in, Chagas' disease), B58.2 — Toxoplasma meningoencephalitis (in, toxoplasmosis), B60.2 — Naegleriasis (in, naegleriasis), B71.9 — Cestode infection, unspecified (parasitic NOS), B75 — Trichinellosis (trichinosis), +158 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Gamma-glutamyl Transferase (GGT) Test, HIV Screening Test, HIV Viral Load, Iron Panel, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of B20 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run B20 with these 24 related codes in Claim Check

Hierarchy

Excludes1

Code First

Referenced by Excludes1 notes (9)

Referenced by Excludes2 notes (28)

Referenced by Code First instructions

Referenced by Use Additional Code instructions

Referenced by Code Also instructions

Clinical classification (CCSR)

Risk adjustment (CMS-HCC)

  • HCC 1 — HIV/AIDS [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

MDC crossing

  • MDC 25 — Human Immunodeficiency Virus Infections[MDC crossing]: “Human Immunodeficiency Virus Infections — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027

Index entries (15)

  • Acquired, immunodeficiency syndrome (AIDS)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • AIDS (related complex)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • ARC (AIDS-related complex)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety), in (due to), human immunodeficiency virusdisease (HIV)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety), in (due to), human immunodeficiency virusdisease (HIV), with behavioral disturbance[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Disease, diseased, human immunodeficiency virus (HIV)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Disease, diseased, slim (HIV)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Disease, diseased, viral, virus, human immunodeficiency (HIV)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • and 7 more

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (15)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Risk adjustment Official source data
2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "B20 — Human immunodeficiency virus [HIV] disease." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/b20-human-immunodeficiency-virus-hiv-disease

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Human immunodeficiency virus [HIV] disease

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.