MCMedicalCodingSoftware
S66.320

S66.320: Laceration of extensor muscle, fascia and tendon of right index finger at wrist and hand level

Non-billable headerICD-10-CMright

S66.320 is a non-billable header ICD-10-CM code for laceration of extensor muscle, fascia and tendon of right index 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 S66.320

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.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead S66.320

3 child codes. Green means billable.

Other codes under S66.32

ICD-10-CMFY2027· effective October 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.