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J43 vs T79.7XXD

J43 (Emphysema) compared with T79.7XXD (Traumatic subcutaneous emphysema, subsequent encounter), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because J43 lists T79.7XXD under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.J43 is “Emphysema”; T79.7XXD is “Traumatic subcutaneous emphysema, subsequent encounter”. J43 is a non-billable header; T79.7XXD is billable. J43 sits in J00-J99 — Diseases of the Respiratory System (J00-J99); T79.7XXD in S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88).

Registry fact

Can these codes be reported together?

Yes, when both are documented.J43 lists T79.7XXD under Excludes2: “traumatic subcutaneous emphysema (T79.7)”. 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 carries 6 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.J43’s tabular entry: “traumatic subcutaneous emphysema (T79.7)”. The note covers T79.7XXD.

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?

One is a header.J43 is a non-billable header, but T79.7XXD is not one of its subdivisions.

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

J43
Emphysema
↔
T79.7XXD
Traumatic subcutaneous emphysema, subsequent encounter

What we found

Yes, when both are documented.J43 carries an Excludes2 note covering T79.7XXD: “traumatic subcutaneous emphysema (T79.7)”

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 FY2027

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

J43EmphysemaT79.7XXDTraumatic subcutaneous emphysema, subsequent encounter
Billing statusNon-billable header

Report instead: J43.0, J43.1, J43.2, J43.8, J43.9

Billable
ClassificationJ00-J99 — Diseases of the Respiratory System (J00-J99)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionEmphysema is a non-billable ICD-10-CM category code (J43).Traumatic subcutaneous emphysema, subsequent encounter is a billable ICD-10-CM diagnosis code (T79.7XXD).
7th character—The appropriate 7th character is to be added to each code from category T79
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)
—
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.-)
emphysema NOS (J43)
emphysema (subcutaneous) resulting from a procedure (T81.82)
acute respiratory distress syndrome (J80)
complications occurring during or following medical procedures (T80-T88)
complications of surgical and medical care NEC (T80-T88)
newborn respiratory distress syndrome (P22.0)

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