Unsp opn wnd abd wall, right upper q w penet perit cav, init

This code signifies an open injury to the right upper abdominal wall that extends through the muscle and fascia, breaching the peritoneal lining. The specific nature of the wound (e.g., laceration, puncture) is not documented.

Apply this code for initial encounters involving penetrating trauma to the right upper quadrant of the abdomen where the wound clearly enters the peritoneal cavity, but the exact type of open wound is not specified by the provider. This is often seen in emergency department settings following stab wounds or other sharp force injuries.

• Ensure documentation explicitly states "penetration into peritoneal cavity" for this code to be appropriate.
• If the specific type of open wound (e.g., laceration, puncture) is documented, a more specific code should be used.
• This code is for the initial encounter; subsequent encounters would require a different 7th character.