S31 vs T18.4
S31 (Open wound of abdomen, lower back, pelvis and external genitals) compared with T18.4 (Foreign body in colon), 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. S31 carries an Excludes2 note covering T18.4: “effects of foreign body in stomach, small intestine and colon (T18.2-T18.4)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| S31Open wound of abdomen, lower back, pelvis and external genitals | T18.4Foreign body in colon | |
|---|---|---|
| Billing status | Non-billable header Report instead: S31.000A, S31.000D, S31.000S, S31.001A, S31.001D | 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 wound of abdomen, lower back, pelvis and external genitals is a non-billable ICD-10-CM category code (S31). | Foreign body in colon is a non-billable ICD-10-CM category code (T18.4). |
| 7th character | The appropriate 7th character is to be added to each code from category S31 | The appropriate 7th character is to be added to each code from category T18 |
| Includes | injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia | — |
| 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