S66.399

S66.399: Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level

Non-billable headerICD-10-CMunspecified

S66.399 is a non-billable header ICD-10-CM code for other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level. 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

Excludes2 inherited from the categories above S66.399

Not part of this code, but both may be coded when both are present.

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

Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level (S66.2-)

Written on S66: Injury of muscle, fascia and tendon at wrist and hand level

sprain of joints and ligaments of wrist and hand (S63.-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

Injury›muscle›finger›extensor›hand level›specified type NEC

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead S66.399

3 child codes. Green means billable.