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I26 vs I82.1

I26 (Pulmonary embolism) compared with I82.1 (Thrombophlebitis migrans), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because I82.1 lists I26 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.I26 is “Pulmonary embolism”; I82.1 is “Thrombophlebitis migrans”. I26 is a non-billable header; I82.1 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.I82.1 lists I26 under Excludes2: “pulmonary (I26.-)”. 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. I26 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.I82.1’s tabular entry: “pulmonary (I26.-)”. The note covers I26.

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.I26 is a non-billable header, but I82.1 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

I82.1
Thrombophlebitis migrans
↔
I26
Pulmonary embolism

What we found

Yes, when both are documented.I82.1 carries an Excludes2 note covering I26: “pulmonary (I26.-)”

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

I26Pulmonary embolismI82.1Thrombophlebitis migrans
Billing statusNon-billable header

Report instead: I26.01, I26.02, I26.03, I26.04, I26.09

Billable
ClassificationI00-I99 — Diseases of the Circulatory System (I00-I99)I00-I99 — Diseases of the Circulatory System (I00-I99)
DefinitionPulmonary embolism is a non-billable ICD-10-CM category code (I26).Thrombophlebitis migrans is a billable ICD-10-CM diagnosis code (I82.1).
Includes
pulmonary (acute) (artery)(vein) infarction
pulmonary (acute) (artery)(vein) thromboembolism
pulmonary (acute) (artery)(vein) thrombosis
—
Excludes1
cor pulmonale without embolism (I27.81)
—
Excludes2
chronic pulmonary embolism (I27.82)
personal history of pulmonary embolism (Z86.711)
pulmonary embolism complicating abortion, ectopic or molar pregnancy (O00-O07, O08.2)
pulmonary embolism complicating pregnancy, childbirth and the puerperium (O88.-)
pulmonary embolism due to trauma (T79.0, T79.1)
pulmonary embolism due to complications of surgical and medical care (T80.0, T81.7-, T82.8-)
septic (non-pulmonary) arterial embolism (I76)
venous embolism and thrombosis (of):
cerebral (I63.6, I67.6)
coronary (I21-I25)
intracranial and intraspinal, septic or NOS (G08)
intracranial, nonpyogenic (I67.6)
intraspinal, nonpyogenic (G95.1)
mesenteric (K55.0-)
portal (I81)
pulmonary (I26.-)
Code first—
venous embolism and thrombosis complicating:
abortion, ectopic or molar pregnancy (O00-O07, O08.7)

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