Laceration with foreign body, unspecified knee

• birth trauma (P10-P15)
• obstetric trauma (O70-O71)

code to identify any retained foreign body, if applicable (Z18.-)

• Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
• The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

• burns and corrosions (T20-T32)
• frostbite (T33-T34)
• injuries of ankle and foot, except fracture of ankle and malleolus (S90-S99)
• insect bite or sting, venomous (T63.4)

• open fracture of knee and lower leg (S82.-)
• traumatic amputation of lower leg (S88.-)

open wound of ankle and foot (S91.-)

any associated wound infection

The appropriate 7th character is to be added to each code from category S81