S04.21
S04.21 — Injury of trochlear nerve, right side
Non-billable headerICD-10-CMright
S04.21 is a non-billable header ICD-10-CM code for injury of trochlear nerve, right side. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category S04
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
S04.21 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead S04.21
3 child codes. Green means billable.
Related codes at this level
Codes that share S04.2. If S04.21 is not quite right, the correct code is usually one of these.
Questions about S04.21
- Is S04.21 a billable ICD-10-CM code?
- No. S04.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does S04.21 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the head (S00-S09).