S31.646 vs S31.647

S31.646 (Puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity) compared with S31.647 (Puncture wound of abdominal wall with foreign body, left flank with penetration into peritoneal cavity), from the official CMS tabular data. S31.646 and S31.647 code the same condition on opposite sides.

Relationship

Review

Laterality relationship

S31.646

Right

Puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity

↔

S31.647

Left

Puncture wound of abdominal wall with foreign body, left flank with penetration into peritoneal cavity

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. S31.646 and S31.647 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

	S31.646Puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity	S31.647Puncture wound of abdominal wall with foreign body, left flank with penetration into peritoneal cavity
Billing status	Non-billable header Report instead: S31.646A, S31.646D, S31.646S	Non-billable header Report instead: S31.647A, S31.647D, S31.647S
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	Puncture wound of abdominal wall with foreign body, right flank with penetration into peritoneal cavity is a non-billable ICD-10-CM category code (S31.646).	Puncture wound of abdominal wall with foreign body, left flank with penetration into peritoneal cavity is a non-billable ICD-10-CM category code (S31.647).
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