S31.633A Puncture wound without foreign body of abdominal wall, right lower quadrant with penetration into peritoneal cavity, initial encounter

ICD-10-CM S31.633A: Puncture Wound Without Foreign Body of Abdominal Wall, Right Lower Quadrant with Penetration into Peritoneal Cavity, Initial Encounter

ICD-10-CM code S31.633A identifies an initial encounter for a puncture wound without a foreign body in the right lower quadrant of the abdominal wall that penetrates the peritoneal cavity. This active diagnosis concept is classified under an injury or poisoning semantic type and appears in Medicare wound care billing articles. 1 5

Plain-language overview

This diagnosis code describes a puncture wound in the right lower abdomen that lacks a foreign body but penetrates the peritoneal cavity, captured during the initial encounter for care. 1

What this code represents

The terminology record classifies S31.633A with the semantic type of Injury or Poisoning and establishes its record status as active for the 2026 version of ICD-10-CM. 1

S31.633A is a narrower concept under the parent code S31.633, which denotes the same abdominal wall puncture wound without specifying the initial encounter character. 1

Clinical context

Penetrating abdominal trauma is frequently caused by gunshot or stab wounds, with the right lower quadrant being one of the documented anatomical locations for such stab wounds. 2

Stab wounds are associated with a lower incidence of intra-abdominal injuries compared to other trauma, and expectant management is indicated for hemodynamically stable patients. 6

Documentation considerations

The official label for S31.633A specifies penetration into the peritoneal cavity, whereas the label for S31.134A specifies a puncture wound of the right lower quadrant without penetration into the peritoneal cavity. 1 3

Coverage and utilization context

The code S31.633A appears in a Medicare billing and coding article for wound care, and a separate Medicare article lists it within an immune globulins billing context. 5 3

What the sources add

While the terminology record provides the official code definition, clinical literature adds that evaluating peritoneal penetration in stable patients involves protocols like local wound exploration or diagnostic laparoscopy. 1 6

Sources

1. ICD-10-CM S31.633A terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Article - Billing and Coding: Immune Globulins (A57554) — cms.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. Article - Billing and Coding: Wound Care (A55909) — cms.gov; accessed 2026-07-27.
6. Penetrating Abdominal Trauma Workup — emedicine.medscape.com; accessed 2026-07-27.