S31.120D vs S31.121D

S31.120D (Laceration of abdominal wall with foreign body, right upper quadrant without penetration into peritoneal cavity, subsequent encounter) compared with S31.121D (Laceration of abdominal wall with foreign body, left upper quadrant without penetration into peritoneal cavity, subsequent encounter), from the official CMS tabular data. S31.120D and S31.121D code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S31.120D

Right

Laceration of abdominal wall with foreign body, right upper quadrant without penetration into peritoneal cavity, subsequent encounter

↔

S31.121D

Left

Laceration of abdominal wall with foreign body, left upper quadrant without penetration into peritoneal cavity, subsequent encounter

Same condition; these differ only in which side is documented.

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source: ICD-10-CM tabular list (laterality variant derived from the code title)

Can these codes be reported together?

Same condition, opposite side. S31.120D and S31.121D name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

Side by side

	S31.120DLaceration of abdominal wall with foreign body, right upper quadrant without penetration into peritoneal cavity, subsequent encounter	S31.121DLaceration of abdominal wall with foreign body, left upper quadrant without penetration into peritoneal cavity, subsequent encounter
Billing status	Billable	Billable
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	Laceration of abdominal wall with foreign body, right upper quadrant without penetration into peritoneal cavity, subsequent encounter is a billable ICD-10-CM diagnosis code (S31.120D).	Laceration of abdominal wall with foreign body, left upper quadrant without penetration into peritoneal cavity, subsequent encounter is a billable ICD-10-CM diagnosis code (S31.121D).
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 S31
Includes	injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia	injuries to the abdominal wall injuries to the anus injuries to the buttock injuries to the external genitalia

Edit this comparison Check a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources