S31.616A vs S31.61AA

S31.616A (Laceration without foreign body of abdominal wall, right flank with penetration into peritoneal cavity, initial encounter) compared with S31.61AA (Laceration without foreign body of abdominal wall, unspecified flank with penetration into peritoneal cavity, initial encounter), from the official CMS tabular data. S31.616A and S31.61AA code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S31.616A

Right

Laceration without foreign body of abdominal wall, right flank with penetration into peritoneal cavity, initial encounter

↔

S31.61AA

Unspecified

Laceration without foreign body of abdominal wall, unspecified flank with penetration into peritoneal cavity, initial 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. S31.616A and S31.61AA 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

	S31.616ALaceration without foreign body of abdominal wall, right flank with penetration into peritoneal cavity, initial encounter	S31.61AALaceration without foreign body of abdominal wall, unspecified flank with penetration into peritoneal cavity, initial 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 without foreign body of abdominal wall, right flank with penetration into peritoneal cavity, initial encounter is a billable ICD-10-CM diagnosis code (S31.616A).	Laceration without foreign body of abdominal wall, unspecified flank with penetration into peritoneal cavity, initial encounter is a billable ICD-10-CM diagnosis code (S31.61AA).
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

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