S66.595A — Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter
S66.595A is a billable, specific ICD-10-CM code for other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level, initial encounter. It is valid for submission on a claim.
7th character "A" — initial encounter
The appropriate 7th character is to be added to each code from category S66
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes2 inherited from the categories above S66.595A
Also inherited, and the opposite of Excludes1: these conditions are not part of S66.595A, but a patient can have both, so you may code both.
Risk adjustment
S66.595A 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
S66.595A is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53058Billing and Coding: Home Health Physical Therapy
- A53065Billing and Coding: Outpatient Physical Therapy
Code history
S66.595A has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share S66.595. If S66.595A is not quite right, the correct code is usually one of these.
Questions about S66.595A
- Is S66.595A a billable ICD-10-CM code?
- Yes. S66.595A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does S66.595A sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the wrist, hand and fingers (S60-S69).