MCMCB Pro
S66.598A

S66.598AOther injury of intrinsic muscle, fascia and tendon of other finger at wrist and hand level, initial encounter

Billable / specific codeICD-10-CM

S66.598A is a billable, specific ICD-10-CM code for other injury of intrinsic muscle, fascia and tendon of other 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

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Other injury of intrinsic muscle, fascia and tendon of specified finger with unspecified laterality at wrist and hand level

Risk adjustment

S66.598A 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.

Related codes at this level

Codes that share S66.598. If S66.598A is not quite right, the correct code is usually one of these.

Questions about S66.598A

Is S66.598A a billable ICD-10-CM code?
Yes. S66.598A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does S66.598A 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).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.