S23.9XXS vs T17.5

S23.9XXS (Sprain of unspecified parts of thorax, sequela) compared with T17.5 (Foreign body in bronchus), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because S23.9XXS lists T17.5 under Excludes2, which marks them as distinct conditions.

Official rule

What is different?

The conditions named and billing status.S23.9XXS is “Sprain of unspecified parts of thorax, sequela”; T17.5 is “Foreign body in bronchus”. T17.5 is a non-billable header; S23.9XXS is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S23.9XXS 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.S23.9XXS’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?

One is a header.T17.5 is a non-billable header, but S23.9XXS 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

S23.9XXS

Sprain of unspecified parts of thorax, sequela

↔

T17.5

Foreign body in bronchus

What we found

Yes, when both are documented.S23.9XXS 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 Excludes2 Check 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

	S23.9XXSSprain of unspecified parts of thorax, sequela	T17.5Foreign body in bronchus
Billing status	Billable	Non-billable header Report instead: T17.500A, T17.500D, T17.500S, T17.508A, T17.508D
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Sprain of unspecified parts of thorax, sequela is a billable ICD-10-CM diagnosis code (S23.9XXS).	Foreign body in bronchus is a non-billable ICD-10-CM category code (T17.5).
7th character	The appropriate 7th character is to be added to each code from category S23	The appropriate 7th character is to be added to each code from category T17
Includes	avulsion of joint or ligament of thorax laceration of cartilage, joint or ligament of thorax sprain of cartilage, joint or ligament of thorax traumatic hemarthrosis of joint or ligament of thorax	—
Excludes2	dislocation, sprain of sternoclavicular joint (S43.2, S43.6) strain of muscle or tendon of thorax (S29.01-) 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)	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 code	—	code, if known, for foreign body entering into or through a natural orifice (W44.-)
Code also	any associated open wound	—

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 (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources