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J43.2 vs J68.4

J43.2 (Centrilobular emphysema) compared with J68.4 (Chronic respiratory conditions due to chemicals, gases, fumes and vapors), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because J43.2 lists J68.4 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.J43.2 is “Centrilobular emphysema”; J68.4 is “Chronic respiratory conditions due to chemicals, gases, fumes and vapors”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.J43.2 lists J68.4 under Excludes2: “emphysema due to inhalation of chemicals, gases, fumes or vapors (J68.4)”. 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. J43.2 carries 6 Excludes1 notes and J68.4 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.J43.2’s tabular entry: “emphysema due to inhalation of chemicals, gases, fumes or vapors (J68.4)”. The note covers J68.4.

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?

No order is given.The Code Also note linking them states no sequencing order; sequence by the reason for the encounter.

Official ruleGuide: Code First vs Use Additional Code vs Code Also

Are there other coding relationships?

Yes.Both codes may be needed together. J68.4 carries a Code Also note covering J43.2: “emphysema (J43.-)”

Official ruleGuide: Code First vs Use Additional Code vs Code Also

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

Code Also relationship

J68.4
Chronic respiratory conditions due to chemicals, gases, fumes and vapors
↔
J43.2
Centrilobular emphysema

What we found

Both codes may be needed together.J68.4 carries a Code Also note covering J43.2: “emphysema (J43.-)”

A Code Also note means the two codes may both be required to fully describe the condition. CMS states no sequencing order for it — sequence by the reason for the encounter.

What to review

Report both when both are needed to describe the condition, sequenced by the reason for the encounter.

Guide: Code First vs Use Additional Code vs Code AlsoCheck these on a claim

Why it matters

A "Code Also" note means two codes may be required together, but the Guidelines state no sequencing order for it -- sequence by the reason for the encounter, not by this relationship.

Source / rule

CMS ICD-10-CM tabular instructional notes

Informational

Excludes2 relationship

J43.2
Centrilobular emphysema
↔
J68.4
Chronic respiratory conditions due to chemicals, gases, fumes and vapors

What we found

Yes, when both are documented.J43.2 carries an Excludes2 note covering J68.4: “emphysema due to inhalation of chemicals, gases, fumes or vapors (J68.4)”

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

  • Section I.A.17 — “Code also ” note · applies to: Code also

    A “code also” note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction. The sequencing depends on the circumstances of the encounter.

    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

J43.2Centrilobular emphysemaJ68.4Chronic respiratory conditions due to chemicals, gases, fumes and vapors
Billing statusBillableBillable
ClassificationJ00-J99 — Diseases of the Respiratory System (J00-J99)J00-J99 — Diseases of the Respiratory System (J00-J99)
DefinitionCentrilobular emphysema is a billable ICD-10-CM diagnosis code (J43.2).Chronic respiratory conditions due to chemicals, gases, fumes and vapors is a billable ICD-10-CM diagnosis code (J68.4).
Excludes1
compensatory emphysema (J98.3)
interstitial emphysema (J98.2)
mediastinal emphysema (J98.2)
neonatal interstitial emphysema (P25.0)
surgical (subcutaneous) emphysema (T81.82)
bronchitis due to chemicals, gases, fumes and vapors (J68.0)
chronic pulmonary edema due to chemicals, gases, fumes and vapors (J68.1)
Excludes2
emphysema due to inhalation of chemicals, gases, fumes or vapors (J68.4)
emphysema with chronic (obstructive) bronchitis (J44.-)
emphysematous (obstructive) bronchitis (J44.-)
traumatic subcutaneous emphysema (T79.7)
cystic fibrosis (E84.-)
asthma (J45.-)
malignant neoplasm of bronchus and lung (C34.-)
Code first—
(T51-T65) to identify cause
Use additional code—
code to identify associated respiratory conditions, such as:
acute respiratory failure (J96.0-)
Code also—
, if applicable, chronic conditions, such as:
emphysema (J43.-)
obliterative bronchiolitis (J44.81)
pulmonary fibrosis (J84.10)
chronic bronchitis (J42)

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