S66.39 Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level is S66.39 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
S60-S69: Injuries to the wrist, hand and fingers (S60-S69)
Category S66
221 codes (180 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to S66.39:

  • Injury › muscle (and fascia) (and tendon) › finger › ring › extensor (forearm level) › hand level › specified type NEC
  • Injury › muscle (and fascia) (and tendon) › finger › little › extensor (forearm level) › hand level › specified type NEC
  • Injury › muscle (and fascia) (and tendon) › finger › index › extensor (forearm level) › hand level › specified type NEC
  • Injury › muscle (and fascia) (and tendon) › finger › middle › extensor (forearm level) › hand level › specified type NEC

Official Coding Guidelines

Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2
Do not assign injury codes for iatrogenic injuries; code complication

3) Iatrogenic injuries Injury codes from Chapter 19 should not be assigned for injuries that occur during, or as a result of, a medical intervention. Assign the appropriate complication code(s).

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.3

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Cite This Page

Reference S66.39 with the canonical source and edition:

S66.39 — Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/S66.39

Canonical URL: https://icd10codingpro.com/codes/S66.39

Related Codes

Parent Code

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

More Specific Codes

S66.390 Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level S66.391 Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level S66.392 Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level S66.393 Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level S66.394 Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level S66.395 Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level S66.396 Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level S66.397 Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand level S66.398 Other injury of extensor muscle, fascia and tendon of other finger at wrist and hand level S66.399 Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level

Other Codes Under S66.3

S66.30 Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level S66.31 Strain of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level S66.32 Laceration of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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