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R80 vs R84.4

R80 (Proteinuria) compared with R84.4 (Abnormal immunological findings in specimens from respiratory organs and thorax), 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 R84.4 lists R80 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.R80 is “Proteinuria”; R84.4 is “Abnormal immunological findings in specimens from respiratory organs and thorax”. R80 is a non-billable header; R84.4 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.R84.4 lists R80 under Excludes2: “abnormal findings on examination of urine, without diagnosis (R80-R82)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.R84.4’s tabular entry: “abnormal findings on examination of urine, without diagnosis (R80-R82)”. The note covers R80.

Official ruleGuide: Excludes1 vs Excludes2

Is one a parent or header code?

One is a header.R80 is a non-billable header, but R84.4 is not one of its subdivisions.

Registry fact

Nothing found in 3 other checks; 1 check does not apply
Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. R80 carries 5 Excludes1 notes and R84.4 carries 3 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

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

R84.4
Abnormal immunological findings in specimens from respiratory organs and thorax
↔
R80
Proteinuria

What we found

Yes, when both are documented.R84.4 carries an Excludes2 note covering R80: “abnormal findings on examination of urine, without diagnosis (R80-R82)”

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
R80

Proteinuria

R84.4

Abnormal immunological findings in specimens from respiratory organs and thorax

StatusDiffers
R80
Non-billable header

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

Report instead: R80.0, R80.1, R80.2, R80.3, R80.8

R84.4
Billable
Excludes1Differs
Only at R80
  • gestational proteinuria (O12.1-)
  • specific findings indicating disorder of amino-acid metabolism (E70-E72)
  • specific findings indicating disorder of carbohydrate metabolism (E73-E74)
Only at R84.4
  • blood-stained sputum (R04.2)
Shared by both codes (2 notes)
  • abnormal findings on antenatal screening of mother (O28.-)
  • diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Excludes2Differs
R80

None at this code

R84.4
  • abnormal findings on examination of blood, without diagnosis (R70-R79)
  • abnormal findings on examination of urine, without diagnosis (R80-R82)
  • abnormal tumor markers (R97.-)
CategoryDiffers
R80

Is itself a category

R84.4

R84 Abnormal findings in specimens from respiratory organs and thorax

ChapterSame for both

R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99)

IncludesDiffers
R80

None at this code

R84.4
  • abnormal findings in bronchial washings
  • abnormal findings in nasal secretions
  • abnormal findings in pleural fluid
  • abnormal findings in sputum
  • abnormal findings in throat scrapings

No Code first, Use additional code, Code also 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, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.

Edit this comparisonCheck a whole claim

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