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P04 vs Z77.111

P04 (Newborn affected by noxious substances transmitted via placenta or breast milk) compared with Z77.111 (Contact with and (suspected) exposure to water pollution), 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 P04 lists Z77.111 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.P04 is “Newborn affected by noxious substances transmitted via placenta or breast milk”; Z77.111 is “Contact with and (suspected) exposure to water pollution”. P04 is a non-billable header; Z77.111 is billable. P04 sits in P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96); Z77.111 in Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99).

Registry fact

Can these codes be reported together?

Yes, when both are documented.P04 lists Z77.111 under Excludes2: “newborn in contact with and (suspected) exposures hazardous to health not transmitted via placenta or breast milk (Z77.-)”. 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.

Official rule

Is there an Excludes2 relationship?

Yes.P04’s tabular entry: “newborn in contact with and (suspected) exposures hazardous to health not transmitted via placenta or breast milk (Z77.-)”. The note covers Z77.111.

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.P04 is a non-billable header, but Z77.111 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

P04
Newborn affected by noxious substances transmitted via placenta or breast milk
↔
Z77.111
Contact with and (suspected) exposure to water pollution

What we found

Yes, when both are documented.P04 carries an Excludes2 note covering Z77.111: “newborn in contact with and (suspected) exposures hazardous to health not transmitted via placenta or breast milk (Z77.-)”

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
P04

Newborn affected by noxious substances transmitted via placenta or breast milk

Z77.111

Contact with and (suspected) exposure to water pollution

StatusDiffers
P04
Non-billable header

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

Report instead: P04.0, P04.11, P04.12, P04.13, P04.14

Z77.111
Billable
Excludes2Differs
P04
  • congenital malformations (Q00-Q99)
  • encounter for observation of newborn for suspected diseases and conditions ruled out (Z05.-)
  • neonatal jaundice from excessive hemolysis due to drugs or toxins transmitted from mother (P58.4)
  • newborn in contact with and (suspected) exposures hazardous to health not transmitted via placenta or breast milk (Z77.-)
Z77.111
  • contact with and (suspected) exposure to communicable diseases (Z20.-)
  • exposure to (parental) (environmental) tobacco smoke in the perinatal period (P96.81)
  • newborn affected by noxious substances transmitted via placenta or breast milk (P04.-)
  • occupational exposure to risk factors (Z57.-)
  • retained foreign body (Z18.-)
  • retained foreign body fully removed (Z87.821)
  • toxic effects of substances chiefly nonmedicinal as to source (T51-T65)
Code firstDiffers
P04
  • any current condition in newborn, if applicable
Z77.111

None at this code

Code alsoDiffers
P04

None at this code

Z77.111
  • any follow-up examination (Z08-Z09)
CategoryDiffers
P04

Is itself a category

Z77.111

Z77 Other contact with and (suspected) exposures hazardous to health

ChapterDiffers
P04

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

Z77.111

Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99)

IncludesDiffers
P04
  • nonteratogenic effects of substances transmitted via placenta
Z77.111
  • contact with and (suspected) exposures to potential hazards to health

No Excludes1, Use additional code and 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