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J4B ICD-10-CM Code: Pulmonary mycetoma

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

Coding at a Glance

Tabular directives
1 inclusion term · 1 Excludes1 · 1 Excludes2 · 4 code-also instructions

Code Set: New for FY2027 — not valid before October 1, 2026.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for J4B in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Pulmonary fungal ball

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).

Excludes2 — Not Included Here

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

Code Also

Additional codes that may be required to fully describe the encounter.

  • Code also, if known, associated infection, such as:
  • aspergillosis (B44.-)
  • chronic pulmonary coccidioidomycosis (B38.1)
  • pulmonary candidiasis (B37.1)

Coder workflow for J4B

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

Before you code J4B

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with J4B. 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 J4B’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.

    ReviewJ68.0

Consider J4B. Then review the Code Also 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).

Official instructions as workflow

  • Excludes1 — check before selecting J4B(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with J4B: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareJ68.0

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

  • Excludes2 — not part of J4B(1 note)

    Coding workflow: The conditions named in this note are not included in J4B. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareE84

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

  • Code Also — related condition(4 notes)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    ReviewB44, B38.1, B37.1

    See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

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

Documentation: Both the condition J4B 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).

ReviewJ68.0

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.

Code Overview

Pulmonary mycetoma is a billable ICD-10-CM diagnosis code (J4B).

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. 4 Code Also notes — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
  2. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
  3. 1 Excludes2 entry — 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

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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 J4B 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 1 Excludes2 note: B47 — Mycetoma.

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

Referenced by 5 Code Also instructions: B37.1 — Pulmonary candidiasis, B38.0 — Acute pulmonary coccidioidomycosis, B38.1 — Chronic pulmonary coccidioidomycosis, B38.2 — Pulmonary coccidioidomycosis, unspecified, B44 — Aspergillosis.

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

Related Codes

Same Index main term, other category

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

B47.0 — Eumycetoma (mycotic), B47.1 — Actinomycetoma (nocardial), B47.9 — Mycetoma, unspecified

Contextual Map

Every relationship of J4B 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 J4B with these 8 related codes in Claim Check

Hierarchy

Excludes1

Excludes2

  • E84 — Cystic fibrosis[Excludes2]: “cystic fibrosis (E84.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Code Also

Referenced by Excludes2 notes

  • B47 — Mycetoma[Excludes2]: “pulmonary mycetoma (J4B)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

Index entries

  • Ball, pulmonary fungal[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Mycetoma, pulmonary[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Change history

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) 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. "J4B — Pulmonary mycetoma." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/j4b-pulmonary-mycetoma

Change history

  • Upcoming · effective FY2027 — October 1, 2026
    Will be added to the code set
    Pulmonary mycetoma
    FY2027 changes