S21.25 vs T17.4
S21.25 (Open bite of back wall of thorax without penetration into thoracic cavity) compared with T17.4 (Foreign body in trachea), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. S21.25 carries an Excludes2 note covering T17.4: “effects of foreign body in trachea (T17.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| S21.25Open bite of back wall of thorax without penetration into thoracic cavity | T17.4Foreign body in trachea | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| 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 | Open bite of back wall of thorax without penetration into thoracic cavity is a non-billable ICD-10-CM category code (S21.25). | Foreign body in trachea is a non-billable ICD-10-CM category code (T17.4). |
| 7th character | The appropriate 7th character is to be added to each code from category S21 | The appropriate 7th character is to be added to each code from category T17 |
| Includes | injuries of breast injuries of chest (wall) injuries of interscapular area Bite of back wall of thorax NOS | — |
| Use additional code | — | code, if known, for foreign body entering into or through a natural orifice (W44.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources