S66.3Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level

S66.3 is the ICD-10-CM diagnosis code for injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level. It belongs to category S66 (injury of muscle, fascia and tendon at wrist and hand level), block S60-S69 (injuries to the wrist, hand and fingers) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within S66, choose S66.3 (extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level) only when documentation doesn't support a more specific option: long flexor muscle, fascia and tendon of thumb at wrist and hand level (S66.0), flexor muscle, fascia and tendon of other and unspecified finger at wrist and hand level (S66.1), extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2), intrinsic muscle, fascia and tendon of thumb at wrist and hand level (S66.4), intrinsic muscle, fascia and tendon of other and unspecified finger at wrist and hand level (S66.5), other specified muscles, fascia and tendons at wrist and hand level (S66.8) and unspecified muscle, fascia and tendon at wrist and hand level (S66.9).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

The conditions in its Excludes2 note aren't part of S66.3, but may be coded alongside it if the patient has both: Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.