Is S66.899 a billable ICD-10-CM code?

No. S66.899 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S66.899 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).

S66.899

S66.899 — Other injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand

Non-billable headerICD-10-CMunspecified

S66.899 is a non-billable header ICD-10-CM code for other injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand. 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 S66

A: initial encounter
D: subsequent encounter
S: sequela

Risk adjustment

S66.899 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 S66.899

3 child codes. Green means billable.

Related codes at this level

Codes that share S66.89. If S66.899 is not quite right, the correct code is usually one of these.

Questions about S66.899

Is S66.899 a billable ICD-10-CM code?: No. S66.899 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S66.899 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).