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J04.10 vs J42

J04.10 (Acute tracheitis without obstruction) compared with J42 (Unspecified chronic bronchitis), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because J04.10 lists J42 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.J04.10 is “Acute tracheitis without obstruction”; J42 is “Unspecified chronic bronchitis”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.J04.10 lists J42 under Excludes2: “chronic tracheitis (J42)”. 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. J04.10 carries 2 Excludes1 notes and J42 carries 7 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.J04.10’s tabular entry: “chronic tracheitis (J42)”. The note covers J42.

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?

No.Both are billable codes, 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

J04.10
Acute tracheitis without obstruction
↔
J42
Unspecified chronic bronchitis

What we found

Yes, when both are documented.J04.10 carries an Excludes2 note covering J42: “chronic tracheitis (J42)”

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

J04.10Acute tracheitis without obstructionJ42Unspecified chronic bronchitis
Billing statusBillableBillable
ClassificationJ00-J99 — Diseases of the Respiratory System (J00-J99)J00-J99 — Diseases of the Respiratory System (J00-J99)
DefinitionAcute tracheitis without obstruction is a billable ICD-10-CM diagnosis code (J04.10).Unspecified chronic bronchitis is a billable ICD-10-CM diagnosis code (J42).
Includes—
Chronic bronchitis NOS
Chronic tracheitis
Chronic tracheobronchitis
Excludes1
acute obstructive laryngitis [croup] and epiglottitis (J05.-)
chronic obstructive pulmonary disease with acute lower respiratory infection (J44.0)
bronchiolitis obliterans and bronchiolitis obliterans syndrome (J44.81)
chronic asthmatic bronchitis (J44.-)
chronic bronchitis with airways obstruction (J44.-)
chronic emphysematous bronchitis (J44.-)
chronic obstructive pulmonary disease NOS (J44.9)
simple and mucopurulent chronic bronchitis (J41.-)
bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Excludes2
chronic tracheitis (J42)
laryngismus (stridulus) (J38.5)
cystic fibrosis (E84.-)
Use additional code
code (B95-B97) to identify infectious agent.
code to identify:
exposure to environmental tobacco smoke (Z77.22)
exposure to tobacco smoke in the perinatal period (P96.81)
Code also
influenza, if present, such as:
influenza due to identified novel influenza A virus with other respiratory manifestations (J09.X2)
influenza due to other identified influenza virus with other respiratory manifestations (J10.1)
influenza due to unidentified influenza virus with other respiratory manifestations (J11.1)
, if applicable, chronic respiratory conditions due to chemicals, gases, fumes and vapors (J68.4)

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.

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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