Puncture wound without foreign body, unsp knee, init encntr

This code signifies a penetrating injury to the knee, caused by a sharp object, that does not involve any retained foreign material. The specific knee (left or right) is not documented, and this is the initial treatment for the injury.

Apply this code when a patient presents with a fresh puncture wound to the knee, such as from a nail or a needle, and imaging or examination confirms no foreign body is present. This is appropriate for the first encounter for this specific injury, prior to any subsequent follow-up care.

• Ensure documentation explicitly states "puncture wound" and "without foreign body."
• Verify the laterality of the knee is not specified in the medical record to use the "unspecified" option.
• Confirm this is the initial treatment session for the injury; subsequent encounters will require a different seventh character.