Chapter XIX
Injury, poisoning and certain other consequences of external causes
(S00-T98)

Injuries to the knee and lower leg
(S80-S89)

Includes: fracture of ankle and malleolus
Excludes: bilateral involvement of knee and lower leg ( T00-T07 )
burns and corrosions ( T20-T32 )
frostbite ( T33-T35 )
injuries of:
· ankle and foot, except fracture of ankle and malleolus ( S90-S99 )
· leg, level unspecified ( T12-T13 )
insect bite or sting, venomous ( T63.4 )

S80 Superficial injury of lower leg
Excludes: superficial injury of ankle and foot ( S90.- )
S80.0 Contusion of knee
S80.1 Contusion of other and unspecified parts of lower leg
S80.7 Multiple superficial injuries of lower leg
S80.8 Other superficial injuries of lower leg
S80.9 Superficial injury of lower leg, unspecified

S81 Open wound of lower leg
Excludes: open wound of ankle and foot ( S91.- )
traumatic amputation of lower leg ( S88.- )
S81.0 Open wound of knee
S81.7 Multiple open wounds of lower leg
S81.8 Open wound of other parts of lower leg
S81.9 Open wound of lower leg, part unspecified

S82 Fracture of lower leg, including ankle
Includes: malleolus
The following subdivisions are provided for optional use in a supplementary character position where it is not possible or not desired to use multiple coding to identify fracture and open wound; a fracture not indicated as closed or open should be classified as closed.
0 closed
1 open
Excludes: fracture of foot, except ankle ( S92.- )
S82.0 Fracture of patella
Knee cap
S82.1 Fracture of upper end of tibia
Tibial:
· condyles
· head
· proximal end
· tuberosity
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with or without mention of fracture of fibula
S82.2 Fracture of shaft of tibia
With or without mention of fracture of fibula
S82.3 Fracture of lower end of tibia
With or without mention of fracture of fibula
Excludes: medial malleolus ( S82.5 )
S82.4 Fracture of fibula alone
Excludes: lateral malleolus ( S82.6 )
S82.5 Fracture of medial malleolus
Tibia involving:
· ankle
· malleolus
S82.6 Fracture of lateral malleolus
Fibula involving:
· ankle
· malleolus
S82.7 Multiple fractures of lower leg
Excludes: fractures of both tibia and fibula:
· lower end ( S82.3 )
· shafts ( S82.2 )
· upper end ( S82.1 )
S82.8 Fractures of other parts of lower leg
Fracture (of):
· ankle NOS
· bimalleolar
· trimalleolar
S82.9 Fracture of lower leg, part unspecified

S83 Dislocation, sprain and strain of joints and ligaments of knee
Excludes: derangement of:
· knee, internal ( M23.- )
· patella ( M22.0-M22.3 )
dislocation of knee:
· old ( M24.3 )
· pathological ( M24.3 )
· recurrent ( M24.4 )
S83.0 Dislocation of patella
S83.1 Dislocation of knee
Tibiofibular (joint)
S83.2 Tear of meniscus, current
Bucket-handle tear (of):
· NOS
· lateral meniscus
· medial meniscus
Excludes: old bucket-handle tear ( M23.2 )
S83.3 Tear of articular cartilage of knee, current
S83.4 Sprain and strain involving (fibular)(tibial) collateral ligament of knee
S83.5 Sprain and strain involving (anterior)(posterior) cruciate ligament of knee
S83.6 Sprain and strain of other and unspecified parts of knee
Tibiofibular joint and ligament, superior
Excludes: sprain of patellar ligament ( S76.1 )
S83.7 Injury to multiple structures of knee
Injury to (lateral)(medial) meniscus in combination with (collateral)(cruciate) ligaments

S84 Injury of nerves at lower leg level
Excludes: injury of nerves at ankle and foot level ( S94.- )
S84.0 Injury of tibial nerve at lower leg level
S84.1 Injury of peroneal nerve at lower leg level
S84.2 Injury of cutaneous sensory nerve at lower leg level
S84.7 Injury of multiple nerves at lower leg level
S84.8 Injury of other nerves at lower leg level
S84.9 Injury of unspecified nerve at lower leg level

S85 Injury of blood vessels at lower leg level
Excludes: injury of blood vessels at ankle and foot level ( S95.- )
S85.0 Injury of popliteal artery
S85.1 Injury of (anterior)(posterior) tibial artery
S85.2 Injury of peroneal artery
S85.3 Injury of greater saphenous vein at lower leg level
Greater saphenous vein NOS
S85.4 Injury of lesser saphenous vein at lower leg level
S85.5 Injury of popliteal vein
S85.7 Injury of multiple blood vessels at lower leg level
S85.8 Injury of other blood vessels at lower leg level
S85.9 Injury of unspecified blood vessel at lower leg level

S86 Injury of muscle and tendon at lower leg level
Excludes: injury of:
· muscle and tendon at or below ankle ( S96.- )
· patellar ligament (tendon) ( S76.1 )
S86.0 Injury of Achilles tendon
S86.1 Injury of other muscle(s) and tendon(s) of posterior muscle group at lower leg level
S86.2 Injury of muscle(s) and tendon(s) of anterior muscle group at lower leg level
S86.3 Injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level
S86.7 Injury of multiple muscles and tendons at lower leg level
S86.8 Injury of other muscles and tendons at lower leg level
S86.9 Injury of unspecified muscle and tendon at lower leg level

S87 Crushing injury of lower leg
Excludes: crushing injury of ankle and foot ( S97.- )
S87.0 Crushing injury of knee
S87.8 Crushing injury of other and unspecified parts of lower leg

S88 Traumatic amputation of lower leg
Excludes: traumatic amputation of:
· ankle and foot ( S98.- )
· leg, level unspecified ( T13.6 )
S88.0 Traumatic amputation at knee level
S88.1 Traumatic amputation at level between knee and ankle
S88.9 Traumatic amputation of lower leg, level unspecified

S89 Other and unspecified injuries of lower leg
Excludes: other and unspecified injuries of ankle and foot ( S99.- )
S89.7 Multiple injuries of lower leg
Injuries classifiable to more than one of the categories S80-S88
S89.8 Other specified injuries of lower leg
S89.9 Unspecified injury of lower leg