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J15 vs P24

J15 (Bacterial pneumonia, not elsewhere classified) compared with P24 (Neonatal aspiration), 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 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because J15 lists P24 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and chapter.J15 is “Bacterial pneumonia, not elsewhere classified”; P24 is “Neonatal aspiration”. J15 sits in J00-J99 — Diseases of the Respiratory System (J00-J99); P24 in P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96).

Registry fact

Can these codes be reported together?

Yes, when both are documented.J15 lists P24 under Excludes2: “neonatal aspiration pneumonia (P24.-)”. 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. J15 carries 4 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.J15’s tabular entry: “neonatal aspiration pneumonia (P24.-)”. The note covers P24.

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

J15
Bacterial pneumonia, not elsewhere classified
↔
P24
Neonatal aspiration

What we found

Yes, when both are documented.J15 carries an Excludes2 note covering P24: “neonatal aspiration pneumonia (P24.-)”

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

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
J15

Bacterial pneumonia, not elsewhere classified

P24

Neonatal aspiration

StatusDiffers
J15
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: J15.0, J15.1, J15.20, J15.211, J15.212

P24
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: P24.00, P24.01, P24.10, P24.11, P24.20

Excludes1Differs
J15
  • chlamydial pneumonia (J16.0)
  • congenital pneumonia (P23.-)
  • Legionnaires' disease (A48.1)
  • spirochetal pneumonia (A69.8)
P24

None at this code

Excludes2Differs
J15
  • allergic or eosinophilic pneumonia (J82)
  • aspiration pneumonia NOS (J69.0)
  • meconium pneumonia (P24.01)
  • neonatal aspiration pneumonia (P24.-)
  • pneumonia due to solids and liquids (J69.-)
  • congenital pneumonia (P23.9)
  • lipid pneumonia (J69.1)
  • rheumatic pneumonia (I00)
  • ventilator associated pneumonia (J95.851)
P24

None at this code

Code firstDiffers
J15
  • , if applicable, associated influenza (J09.X1, J10.0-, J11.0-)
P24

None at this code

Use additional codeDiffers
J15
  • code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)
P24

None at this code

Code alsoDiffers
J15
  • , if applicable, any associated condition such as:
  • abscess (J85.1)
  • aspiration pneumonia (J69.-)
P24

None at this code

CategorySame for both

Is itself a category

ChapterDiffers
J15

J00-J99 — Diseases of the Respiratory System (J00-J99)

P24

P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)

IncludesDiffers
J15
  • bronchopneumonia due to bacteria other than S. pneumoniae and H. influenzae
P24
  • aspiration in utero and during delivery

No 7th character note at either code.

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. In a row that differs, notes every code shares are dimmed.

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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