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Injury, poisoning and certain other consequences of external causes (S00-T88)

Note:: 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.

Use additional: code to identify any retained foreign body, if applicable (Z18.-)
Excludes 1:: birth trauma (P10-P15)
obstetric trauma (O70-O71)

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

Excludes 2:: 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)

S80

Superficial injury of knee and lower leg [+]

Excludes 2:	superficial injury of ankle and foot (S90.-)
The appropriate 7th character is to be added to each code from category S80 A - initial encounter D - subsequent encounter S - sequela

S81

Open wound of knee and lower leg [+]

Code also	any associated wound infection
Excludes 1:	open fracture of knee and lower leg (S82.-) traumatic amputation of lower leg (S88.-)
Excludes 2:	open wound of ankle and foot (S91.-)
The appropriate 7th character is to be added to each code from category S81 A - initial encounter D - subsequent encounter S - sequela

S82

Fracture of lower leg, including ankle [+]

Note:

A fracture not indicated as displaced or nondisplaced should be coded to displaced
A fracture not indicated as open or closed should be coded to closed
The open fracture designations are based on the Gustilo open fracture classification

Includes:	fracture of malleolus
Excludes 1:	traumatic amputation of lower leg (S88.-)
Excludes 2:	fracture of foot, except ankle (S92.-) periprosthetic fracture around internal prosthetic ankle joint (M97.2) periprosthetic fracture around internal prosthetic implant of knee joint (M97.1-)
The appropriate 7th character is to be added to all codes from category S82 A - initial encounter for closed fracture B - initial encounter for open fracture type I or II C - initial encounter for open fracture type IIIA, IIIB, or IIIC D - subsequent encounter for closed fracture with routine healing E - subsequent encounter for open fracture type I or II with routine healing F - subsequent encounter for open fracture type IIIA, IIIB, or IIIC with routine healing G - subsequent encounter for closed fracture with delayed healing H - subsequent encounter for open fracture type I or II with delayed healing J - subsequent encounter for open fracture type IIIA, IIIB, or IIIC with delayed healing K - subsequent encounter for closed fracture with nonunion M - subsequent encounter for open fracture type I or II with nonunion N - subsequent encounter for open fracture type IIIA, IIIB, or IIIC with nonunion P - subsequent encounter for closed fracture with malunion Q - subsequent encounter for open fracture type I or II with malunion R - subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion S - sequela

S83

Dislocation and sprain of joints and ligaments of knee [+]

Includes:	avulsion of joint or ligament of knee laceration of cartilage, joint or ligament of knee sprain of cartilage, joint or ligament of knee traumatic hemarthrosis of joint or ligament of knee traumatic rupture of joint or ligament of knee traumatic subluxation of joint or ligament of knee traumatic tear of joint or ligament of knee
Code also	any associated open wound
Excludes 2:	derangement of patella (M22.0-M22.3) injury of patellar ligament (tendon) (S76.1-) internal derangement of knee (M23.-) old dislocation of knee (M24.36) pathological dislocation of knee (M24.36) recurrent dislocation of knee (M22.0) strain of muscle, fascia and tendon of lower leg (S86.-)
The appropriate 7th character is to be added to each code from category S83 A - initial encounter D - subsequent encounter S - sequela

S84

Injury of nerves at lower leg level [+]

Code also	any associated open wound (S81.-)
Excludes 2:	injury of nerves at ankle and foot level (S94.-)
The appropriate 7th character is to be added to each code from category S84 A - initial encounter D - subsequent encounter S - sequela

S85

Injury of blood vessels at lower leg level [+]

Code also	any associated open wound (S81.-)
Excludes 2:	injury of blood vessels at ankle and foot level (S95.-)
The appropriate 7th character is to be added to each code from category S85 A - initial encounter D - subsequent encounter S - sequela

S86

Injury of muscle, fascia and tendon at lower leg level [+]

Code also	any associated open wound (S81.-)
Excludes 2:	injury of muscle, fascia and tendon at ankle (S96.-) injury of patellar ligament (tendon) (S76.1-) sprain of joints and ligaments of knee (S83.-)
The appropriate 7th character is to be added to each code from category S86 A - initial encounter D - subsequent encounter S - sequela

S87

Crushing injury of lower leg [+]

Use additional	code(s) for all associated injuries
Excludes 2:	crushing injury of ankle and foot (S97.-)
The appropriate 7th character is to be added to each code from category S87 A - initial encounter D - subsequent encounter S - sequela

S88

Traumatic amputation of lower leg [+]
An amputation not identified as partial or complete should be coded to complete

Excludes 1:	traumatic amputation of ankle and foot (S98.-)
The appropriate 7th character is to be added to each code from category S88 A - initial encounter D - subsequent encounter S - sequela

S89

Other and unspecified injuries of lower leg [+]

Note:

A fracture not indicated as open or closed should be coded to closed

Excludes 2:	other and unspecified injuries of ankle and foot (S99.-)
The appropriate 7th character is to be added to each code from subcategories S89.0, S89.1, S89.2, and S89.3 A - initial encounter for closed fracture D - subsequent encounter for fracture with routine healing G - subsequent encounter for fracture with delayed healing K - subsequent encounter for fracture with nonunion P - subsequent encounter for fracture with malunion S - sequela