S04.21XD
S04.21XD — Injury of trochlear nerve, right side, subsequent encounter
Billable / specific codeICD-10-CMPOA exemptright
S04.21XD is a billable, specific ICD-10-CM code for injury of trochlear nerve, right side, subsequent encounter. It is valid for submission on a claim.
7th character "D" — subsequent encounter
The appropriate 7th character is to be added to each code from category S04
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
S04.21XD 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.
Medicare coverage
S04.21XD is named in 6 Medicare coverage policies — 6 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53065Billing and Coding: Outpatient Physical Therapy
- A54095Billing and Coding: Nerve Conduction Studies and Electromyography
- A56612Billing and Coding: CT of the Head
- A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
Related codes at this level
Codes that share S04.21. If S04.21XD is not quite right, the correct code is usually one of these.
Questions about S04.21XD
- Is S04.21XD a billable ICD-10-CM code?
- Yes. S04.21XD is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does S04.21XD 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).