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B35-B49 vs J67

B35-B49 (Mycoses (B35-B49)) compared with J67 (Hypersensitivity pneumonitis due to organic dust), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because B35-B49 lists J67 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.B35-B49 is “Mycoses (B35-B49)”; J67 is “Hypersensitivity pneumonitis due to organic dust”. B35-B49 sits in A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99); J67 in J00-J99 — Diseases of the Respiratory System (J00-J99).

Registry fact

Can these codes be reported together?

Yes, when both are documented.B35-B49 lists J67 under Excludes2: “hypersensitivity pneumonitis due to organic dust (J67.-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. J67 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.B35-B49’s tabular entry: “hypersensitivity pneumonitis due to organic dust (J67.-)”. The note covers J67.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

B35-B49
Mycoses (B35-B49)
↔
J67
Hypersensitivity pneumonitis due to organic dust

What we found

Yes, when both are documented.B35-B49 carries an Excludes2 note covering J67: “hypersensitivity pneumonitis due to organic dust (J67.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

B35-B49Mycoses (B35-B49)J67Hypersensitivity pneumonitis due to organic dust
Billing statusNon-billable headerNon-billable header

Report instead: J67.0, J67.1, J67.2, J67.3, J67.4

ClassificationA00-B99 — Certain Infectious and Parasitic Diseases (A00-B99)J00-J99 — Diseases of the Respiratory System (J00-J99)
DefinitionMycoses (B35-B49) is a non-billable ICD-10-CM category code (B35-B49).Hypersensitivity pneumonitis due to organic dust is a non-billable ICD-10-CM category code (J67).
Includes—
allergic alveolitis and pneumonitis due to inhaled organic dust and particles of fungal, actinomycetic or other origin
Excludes1—
pneumonitis due to inhalation of chemicals, gases, fumes or vapors (J68.0)
Excludes2
hypersensitivity pneumonitis due to organic dust (J67.-)
mycosis fungoides (C84.0-)
asthma (J45.-)
malignant neoplasm of bronchus and lung (C34.-)

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources