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B39.1 ICD-10-CM Code: Chronic pulmonary histoplasmosis capsulati

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

Coding at a Glance

Tabular directives
2 Excludes2 · 5 use-additional codes · 1 code-first instruction
Risk adjustment
CMS-HCC V22 category 115

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 177 — RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH MCC (MDC 04)
  • MS-DRG 178 — RESPIRATORY INFECTIONS AND INFLAMMATIONS WITH CC (MDC 04)
  • MS-DRG 179 — RESPIRATORY INFECTIONS AND INFLAMMATIONS WITHOUT CC/MCC (MDC 04)
  • MS-DRG 791 — PREMATURITY WITH MAJOR PROBLEMS (MDC 15)
  • MS-DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)
  • 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)

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.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for B39.1 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

Notes without a marker are published on B39.1 itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from B35-B49

Code First

Underlying conditions that must be sequenced before this code.

  • associated AIDS (B20)

Source: inherited from B39

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code for any associated manifestations, such as:
  • endocarditis (I39)
  • meningitis (G02)
  • pericarditis (I32)
  • retinitis (H32)

Source: inherited from B39

Coder workflow for B39.1

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

Choose the right path

  1. Is the underlying (etiologic) condition the Code First note names documented?
    Yes → Sequence the underlying condition first, then B39.1.
    No → Continue; do not add an underlying condition the record does not document.

    ReviewB20

Consider B39.1. 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).
Acuity
Acute or chronic as documented; when both are documented and separate codes exist, both are reported with the acute code first (Guidelines I.B.8).
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

  • Excludes2 — not part of B39.1(2 notes)

    Coding workflow: The conditions named in this note are not included in B39.1. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareJ67, C84.0

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

  • 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 B39.1. Do not add an underlying condition the record does not document.

    ReviewB20

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

  • Use Additional Code — after identifying B39.1(5 notes)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with B39.1 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    ReviewI39, G02, I32, H32

    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: 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).

ReviewB20

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

Coding question: Is a second code reported with B39.1?

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).

ReviewI39, G02, I32, H32

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 B39.1 with…

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

The codes most likely to be picked instead of B39.1 — 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.

  • B39.2— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Pulmonary histoplasmosis capsulati, unspecified” takes B39.2; specificity in the record moves it back here.

    Full comparison: B39.1 vs B39.2 →

  • J67— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of hypersensitivity pneumonitis due to organic dust adds J67; it is not part of this code and both may be reported when both are documented.

    Full comparison: B39.1 vs J67 →

  • C84.0— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of mycosis fungoides adds C84.0; it is not part of this code and both may be reported when both are documented.

    Full comparison: B39.1 vs C84.0 →

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.

Code Overview

Chronic pulmonary histoplasmosis capsulati is a billable ICD-10-CM diagnosis code (B39.1).

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

Indexed Clinical Terms (2)

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.

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. 5 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  3. 2 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 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

  • MCC 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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name B39.1 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 2 Excludes1 notes: J17 — Pneumonia in diseases classified elsewhere, J99 — Respiratory disorders in diseases classified elsewhere.

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

Referenced by 2 Code First instructions across 2 chapters: H32 — Chorioretinal disorders in diseases classified elsewhere (via B39.-), M01 — Direct infections of joint in infectious and parasitic diseases classified elsewhere (via B39.-).

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.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: MCC — Major 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 112 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 8 MS-DRGs: DRG 177 (MDC 04), DRG 178 (MDC 04), DRG 179 (MDC 04), DRG 791 (MDC 15), DRG 793 (MDC 15), DRG 974 (MDC 25), DRG 975 (MDC 25), DRG 976 (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):RSP002 — Pneumonia (except that caused by tuberculosis) (default); INF004 — Fungal infections.

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 MCC — 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.

A22.1 — Pulmonary anthrax, A37.01 — Whooping cough due to Bordetella pertussis with pneumonia, A37.11 — Whooping cough due to Bordetella parapertussis with pneumonia, A37.81 — Whooping cough due to other Bordetella species with pneumonia, A37.91 — Whooping cough, unspecified species with pneumonia, A48.1 — Legionnaires' disease, B25.0 — Cytomegaloviral pneumonitis, B39.0 — Acute pulmonary histoplasmosis capsulati, B39.2 — Pulmonary histoplasmosis capsulati, unspecified, B39.3 — Disseminated histoplasmosis capsulati, B39.4 — Histoplasmosis capsulati, unspecified, B39.9 — Histoplasmosis, unspecified, B44.0 — Invasive pulmonary aspergillosis, B48.3 — Geotrichosis, B49 — Unspecified mycosis, 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, J09.X1 — Influenza due to identified novel influenza A virus with pneumonia, +91 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical categories (Pneumonia (except that caused by tuberculosis), Fungal infections).

B38.0 — Acute pulmonary coccidioidomycosis, B38.1 — Chronic pulmonary coccidioidomycosis, B38.2 — Pulmonary coccidioidomycosis, unspecified, B38.3 — Cutaneous coccidioidomycosis, B38.4 — Coccidioidomycosis meningitis, B38.7 — Disseminated coccidioidomycosis, B38.81 — Prostatic coccidioidomycosis, B38.89 — Other forms of coccidioidomycosis, B38.9 — Coccidioidomycosis, unspecified, B39.0 — Acute pulmonary histoplasmosis capsulati, B39.2 — Pulmonary histoplasmosis capsulati, unspecified, B39.3 — Disseminated histoplasmosis capsulati, B39.4 — Histoplasmosis capsulati, unspecified, B39.5 — Histoplasmosis duboisii, B39.9 — Histoplasmosis, unspecified, B40.0 — Acute pulmonary blastomycosis, B40.1 — Chronic pulmonary blastomycosis, B40.2 — Pulmonary blastomycosis, unspecified, B40.3 — Cutaneous blastomycosis, B40.7 — Disseminated blastomycosis, +147 more

Same Index main term, other category

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

A70 — Chlamydia psittaci infections (psittacosis), A78 — Q fever (in, Q fever), B01.2 — Varicella pneumonia (varicella), B05.2 — Measles complicated by pneumonia (giant cell), B06.81 — Rubella pneumonia (in, rubella), B25.0 — Cytomegaloviral pneumonitis (cytomegaloviral), B37.1 — Pulmonary candidiasis (Candida), B38.0 — Acute pulmonary coccidioidomycosis (in, coccidioidomycosis, acute), B38.1 — Chronic pulmonary coccidioidomycosis (in, coccidioidomycosis, chronic), B38.2 — Pulmonary coccidioidomycosis, unspecified (in, coccidioidomycosis), B44.9 — Aspergillosis, unspecified (in, aspergillosis), B58.3 — Pulmonary toxoplasmosis (in, toxoplasmosis), B59 — Pneumocystosis (plasma cell), B65.9 — Schistosomiasis, unspecified (in, schistosomiasis), B77.81 — Ascariasis pneumonia (Ascaris), B99 — Other and unspecified infectious diseases (postinfectional NEC), I00 — Rheumatic fever without heart involvement (rheumatic), J12.0 — Adenoviral pneumonia (adenoviral), J12.1 — Respiratory syncytial virus pneumonia (respiratory syncytial virus), J12.2 — Parainfluenza virus pneumonia (parainfluenza virus), +80 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.

HIV Screening Test

Contextual Map

Every relationship of B39.1 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 B39.1 with these 4 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Code First instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 04 — Diseases and Disorders of the Respiratory System[MDC crossing]: “Diseases and Disorders of the Respiratory System — 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. 4,000 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027
  • MDC 15 — Newborns and Other Neonates with Conditions Originating in Perinatal Period[MDC crossing]: “Newborns and Other Neonates with Conditions Originating in Perinatal Period — 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

  • Histoplasmosis, capsulati, pulmonary, chronic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved), in (due to), histoplasmosis, chronic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

Change history

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

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
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
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 structured 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 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

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. "B39.1 — Chronic pulmonary histoplasmosis capsulati." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/b39.1-chronic-pulmonary-histoplasmosis-capsulati

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Chronic pulmonary histoplasmosis capsulati

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.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to B39.1 in its code family, with their registry titles.

View all codes in the B39 family