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S20-S29 vs T17.5

S20-S29 (Injuries to the thorax (S20-S29)) compared with T17.5 (Foreign body in bronchus), 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 S20-S29 lists T17.5 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.S20-S29 is “Injuries to the thorax (S20-S29)”; T17.5 is “Foreign body in bronchus”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S20-S29 lists T17.5 under Excludes2: “effects of foreign body in bronchus (T17.5)”. 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.S20-S29’s tabular entry: “effects of foreign body in bronchus (T17.5)”. The note covers T17.5.

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

S20-S29
Injuries to the thorax (S20-S29)
↔
T17.5
Foreign body in bronchus

What we found

Yes, when both are documented.S20-S29 carries an Excludes2 note covering T17.5: “effects of foreign body in bronchus (T17.5)”

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
S20-S29

Injuries to the thorax (S20-S29)

T17.5

Foreign body in bronchus

StatusDiffers
S20-S29
Non-billable header

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

T17.5
Non-billable header

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

Report instead: T17.500A, T17.500D, T17.500S, T17.508A, T17.508D

Excludes2Differs
S20-S29
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)
T17.5
  • foreign body accidentally left in operation wound (T81.5-)
  • foreign body in penetrating wound - See open wound by body region
  • residual foreign body in soft tissue (M79.5)
  • splinter, without open wound - See superficial injury by body region
Use additional codeDiffers
S20-S29

None at this code

T17.5
  • code, if known, for foreign body entering into or through a natural orifice (W44.-)
CategoryDiffers
S20-S29

S20 Superficial injury of thorax

T17.5

T17 Foreign body in respiratory tract

ChapterSame for both

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesDiffers
S20-S29
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area
T17.5

None at this code

7th characterDiffers
S20-S29

None at this code

T17.5
  • The appropriate 7th character is to be added to each code from category T17

No Excludes1, Code first and Code also 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