Injury of trochlear nerve, right side

• 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.

The selection of side should be based on the side of the body being affected

any associated intracranial injury (S06.-)

• any associated:
• open wound of head (S01.-)
• skull fracture (S02.-)

The appropriate 7th character is to be added to each code from category S04

• injuries of ear
• injuries of eye
• injuries of face [any part]
• injuries of gum
• injuries of jaw
• injuries of oral cavity
• injuries of palate
• injuries of periocular area
• injuries of scalp
• injuries of temporomandibular joint area
• injuries of tongue
• injuries of tooth

• burns and corrosions (T20-T32)
• effects of foreign body in ear (T16)
• effects of foreign body in larynx (T17.3)
• effects of foreign body in mouth NOS (T18.0)
• effects of foreign body in nose (T17.0-T17.1)
• effects of foreign body in pharynx (T17.2)
• effects of foreign body on external eye (T15.-)
• frostbite (T33-T34)
• insect bite or sting, venomous (T63.4)

for any associated infection

Injury of 4th cranial nerve