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R79 vs R89.8

R79 (Other abnormal findings of blood chemistry) compared with R89.8 (Other abnormal findings in specimens from other organs, systems and tissues), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because R89.8 lists R79 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

Title wording and billing status.The titles share “Other abnormal findings”; R79 says “of blood chemistry” where R89.8 says “in specimens from other organs, systems and tissues”. R79 is a non-billable header; R89.8 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.R89.8 lists R79 under Excludes2: “abnormal findings on examination of blood, without diagnosis (R70-R79)”. 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. R79 carries 6 Excludes1 notes and R89.8 carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.R89.8’s tabular entry: “abnormal findings on examination of blood, without diagnosis (R70-R79)”. The note covers R79.

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.R79 is a non-billable header, but R89.8 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

R89.8
Other abnormal findings in specimens from other organs, systems and tissues
↔
R79
Other abnormal findings of blood chemistry

What we found

Yes, when both are documented.R89.8 carries an Excludes2 note covering R79: “abnormal findings on examination of blood, without diagnosis (R70-R79)”

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

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

R79Other abnormal findings of blood chemistryR89.8Other abnormal findings in specimens from other organs, systems and tissues
Billing statusNon-billable header

Report instead: R79.0, R79.1, R79.81, R79.82, R79.83

Billable
ClassificationR00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99)R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99)
DefinitionOther abnormal findings of blood chemistry is a non-billable ICD-10-CM category code (R79).Other abnormal findings in specimens from other organs, systems and tissues is a billable ICD-10-CM diagnosis code (R89.8).
Includes—
abnormal findings in nipple discharge
abnormal findings in synovial fluid
abnormal findings in wound secretions
Abnormal chromosomal findings in specimens from other organs, systems and tissues
Excludes1
asymptomatic hyperuricemia (E79.0)
hypoglycemia NOS (E16.2)
neonatal hypoglycemia (P70.3-P70.4)
specific findings indicating disorder of amino-acid metabolism (E70-E72)
specific findings indicating disorder of carbohydrate metabolism (E73-E74)
specific findings indicating disorder of lipid metabolism (E75.-)
abnormal findings on antenatal screening of mother (O28.-)
diagnostic abnormal findings classified elsewhere - see Alphabetical Index
Excludes2
abnormal findings on antenatal screening of mother (O28.-)
abnormalities of lipids (E78.-)
abnormalities of platelets and thrombocytes (D69.-)
abnormalities of white blood cells classified elsewhere (D70-D72)
coagulation hemorrhagic disorders (D65-D68)
diagnostic abnormal findings classified elsewhere - see Alphabetical Index
hemorrhagic and hematological disorders of newborn (P50-P61)
hyperglycemia NOS (R73.9)
abnormal findings on examination of blood, without diagnosis (R70-R79)
abnormal findings on examination of urine, without diagnosis (R80-R82)
abnormal tumor markers (R97.-)
Use additional code
code to identify any retained foreign body, if applicable (Z18.-)
—

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