S31.634A vs S31.634S

S31.634A (Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, initial encounter) compared with S31.634S (Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, sequela), from the official CMS tabular data. S31.634A and S31.634S code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S31.634A

Initial encounter

Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, initial encounter

↔

S31.634S

Sequela

Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, sequela

Same underlying diagnosis, different encounter phase.

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source: ICD-10-CM Official Guidelines, Section I.C.19.a

Can these codes be reported together?

Same injury, other encounter phase. S31.634A and S31.634S code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

Side by side

	S31.634APuncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, initial encounter	S31.634SPuncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, sequela
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	Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, initial encounter is a billable ICD-10-CM diagnosis code (S31.634A).	Puncture wound without foreign body of abdominal wall, left lower quadrant with penetration into peritoneal cavity, sequela is a billable ICD-10-CM diagnosis code (S31.634S).
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