`S04.2` Injury of trochlear nerve

Non-billable header with 3 child codes.

Applicable to

Injury of 4th cranial nerve

Applies from S04 Injury of cranial nerve

Applicable to

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

Code first

any associated intracranial injury (S06.-)

Code also

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

7th character note

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

7th character required

A — initial encounter
D — subsequent encounter
S — sequela

Codes under S04.2

S04.20 Injury of trochlear nerve, unspecified side
S04.21 Injury of trochlear nerve, right side
S04.22 Injury of trochlear nerve, left side

Code annotations containing back-references to S04.2

Back-references to S04

Code Also: G96.00 Cerebrospinal fluid leak, unspecified ("head injury (S00-S09)")
Code Also: G96.08 Other cranial cerebrospinal fluid leak ("head injury (S00 - S09)")
Code Also: G96.09 Other spinal cerebrospinal fluid leak ("head injury (S00 - S09)")
Code Also: S01 Open wound of head ("injury of cranial nerve (S04.-)")

Diagnosis Index entries for S04.2

Injury › nerve NEC › trochlear
Injury › nerve NEC › trochlear › contusion
Injury › nerve NEC › trochlear › laceration
Injury › nerve NEC › trochlear › specified type NEC

Nearby codes

S04.11XS Injury of oculomotor nerve, right side, sequela
S04.12 Injury of oculomotor nerve, left side
S04.12XA Injury of oculomotor nerve, left side, initial encounter
S04.12XD Injury of oculomotor nerve, left side, subsequent encounter
S04.12XS Injury of oculomotor nerve, left side, sequela
S04.2 Injury of trochlear nerve (this code)
S04.20 Injury of trochlear nerve, unspecified side
S04.20XA Injury of trochlear nerve, unspecified side, initial encounter
S04.20XD Injury of trochlear nerve, unspecified side, subsequent encounter
S04.20XS Injury of trochlear nerve, unspecified side, sequela
S04.21 Injury of trochlear nerve, right side