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

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Injury of muscle, fascia and tendon at wrist and hand level is S66 (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
Excludes2
Not included here. These conditions are coded elsewhere but may be coded together if applicable.
  • sprain of joints and ligaments of wrist and hand (S63.-)
Code Also
  • any associated open wound (S61.-)

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 with the canonical source and edition:

S66 — Injury of muscle, fascia and tendon at wrist and hand level. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/S66

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

Related Codes

All Codes in S66

Every most-specific code under S66 Injury of muscle, fascia and tendon at wrist and hand level (180 codes):

Show the complete S66 code list
S66.001 Unspecified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level S66.002 Unspecified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level S66.009 Unspecified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.011 Strain of long flexor muscle, fascia and tendon of right thumb at wrist and hand level S66.012 Strain of long flexor muscle, fascia and tendon of left thumb at wrist and hand level S66.019 Strain of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.021 Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level S66.022 Laceration of long flexor muscle, fascia and tendon of left thumb at wrist and hand level S66.029 Laceration of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.091 Other specified injury of long flexor muscle, fascia and tendon of right thumb at wrist and hand level S66.092 Other specified injury of long flexor muscle, fascia and tendon of left thumb at wrist and hand level S66.099 Other specified injury of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.100 Unspecified injury of flexor muscle, fascia and tendon of right index finger at wrist and hand level S66.101 Unspecified injury of flexor muscle, fascia and tendon of left index finger at wrist and hand level S66.102 Unspecified injury of flexor muscle, fascia and tendon of right middle finger at wrist and hand level S66.103 Unspecified injury of flexor muscle, fascia and tendon of left middle finger at wrist and hand level S66.104 Unspecified injury of flexor muscle, fascia and tendon of right ring finger at wrist and hand level S66.105 Unspecified injury of flexor muscle, fascia and tendon of left ring finger at wrist and hand level S66.106 Unspecified injury of flexor muscle, fascia and tendon of right little finger at wrist and hand level S66.107 Unspecified injury of flexor muscle, fascia and tendon of left little finger at wrist and hand level S66.108 Unspecified injury of flexor muscle, fascia and tendon of other finger at wrist and hand level S66.109 Unspecified injury of flexor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.110 Strain of flexor muscle, fascia and tendon of right index finger at wrist and hand level S66.111 Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level S66.112 Strain of flexor muscle, fascia and tendon of right middle finger at wrist and hand level S66.113 Strain of flexor muscle, fascia and tendon of left middle finger at wrist and hand level S66.114 Strain of flexor muscle, fascia and tendon of right ring finger at wrist and hand level S66.115 Strain of flexor muscle, fascia and tendon of left ring finger at wrist and hand level S66.116 Strain of flexor muscle, fascia and tendon of right little finger at wrist and hand level S66.117 Strain of flexor muscle, fascia and tendon of left little finger at wrist and hand level S66.118 Strain of flexor muscle, fascia and tendon of other finger at wrist and hand level S66.119 Strain of flexor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.120 Laceration of flexor muscle, fascia and tendon of right index finger at wrist and hand level S66.121 Laceration of flexor muscle, fascia and tendon of left index finger at wrist and hand level S66.122 Laceration of flexor muscle, fascia and tendon of right middle finger at wrist and hand level S66.123 Laceration of flexor muscle, fascia and tendon of left middle finger at wrist and hand level S66.124 Laceration of flexor muscle, fascia and tendon of right ring finger at wrist and hand level S66.125 Laceration of flexor muscle, fascia and tendon of left ring finger at wrist and hand level S66.126 Laceration of flexor muscle, fascia and tendon of right little finger at wrist and hand level S66.127 Laceration of flexor muscle, fascia and tendon of left little finger at wrist and hand level S66.128 Laceration of flexor muscle, fascia and tendon of other finger at wrist and hand level S66.129 Laceration of flexor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.190 Other injury of flexor muscle, fascia and tendon of right index finger at wrist and hand level S66.191 Other injury of flexor muscle, fascia and tendon of left index finger at wrist and hand level S66.192 Other injury of flexor muscle, fascia and tendon of right middle finger at wrist and hand level S66.193 Other injury of flexor muscle, fascia and tendon of left middle finger at wrist and hand level S66.194 Other injury of flexor muscle, fascia and tendon of right ring finger at wrist and hand level S66.195 Other injury of flexor muscle, fascia and tendon of left ring finger at wrist and hand level S66.196 Other injury of flexor muscle, fascia and tendon of right little finger at wrist and hand level S66.197 Other injury of flexor muscle, fascia and tendon of left little finger at wrist and hand level S66.198 Other injury of flexor muscle, fascia and tendon of other finger at wrist and hand level S66.199 Other injury of flexor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.201 Unspecified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level S66.202 Unspecified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level S66.209 Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.211 Strain of extensor muscle, fascia and tendon of right thumb at wrist and hand level S66.212 Strain of extensor muscle, fascia and tendon of left thumb at wrist and hand level S66.219 Strain of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.221 Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand level S66.222 Laceration of extensor muscle, fascia and tendon of left thumb at wrist and hand level S66.229 Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.291 Other specified injury of extensor muscle, fascia and tendon of right thumb at wrist and hand level S66.292 Other specified injury of extensor muscle, fascia and tendon of left thumb at wrist and hand level S66.299 Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.300 Unspecified injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level S66.301 Unspecified injury of extensor muscle, fascia and tendon of left index finger at wrist and hand level S66.302 Unspecified injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand level S66.303 Unspecified injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level S66.304 Unspecified injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand level S66.305 Unspecified injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand level S66.306 Unspecified injury of extensor muscle, fascia and tendon of right little finger at wrist and hand level S66.307 Unspecified injury of extensor muscle, fascia and tendon of left little finger at wrist and hand level S66.308 Unspecified injury of extensor muscle, fascia and tendon of other finger at wrist and hand level S66.309 Unspecified injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.310 Strain of extensor muscle, fascia and tendon of right index finger at wrist and hand level S66.311 Strain of extensor muscle, fascia and tendon of left index finger at wrist and hand level S66.312 Strain of extensor muscle, fascia and tendon of right middle finger at wrist and hand level S66.313 Strain of extensor muscle, fascia and tendon of left middle finger at wrist and hand level S66.314 Strain of extensor muscle, fascia and tendon of right ring finger at wrist and hand level S66.315 Strain of extensor muscle, fascia and tendon of left ring finger at wrist and hand level S66.316 Strain of extensor muscle, fascia and tendon of right little finger at wrist and hand level S66.317 Strain of extensor muscle, fascia and tendon of left little finger at wrist and hand level S66.318 Strain of extensor muscle, fascia and tendon of other finger at wrist and hand level S66.319 Strain of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level S66.320 Laceration of extensor muscle, fascia and tendon of right index finger at wrist and hand level S66.321 Laceration of extensor muscle, fascia and tendon of left index finger at wrist and hand level S66.322 Laceration of extensor muscle, fascia and tendon of right middle finger at wrist and hand level S66.323 Laceration of extensor muscle, fascia and tendon of left middle finger at wrist and hand level S66.324 Laceration of extensor muscle, fascia and tendon of right ring finger at wrist and hand level S66.325 Laceration of extensor muscle, fascia and tendon of left ring finger at wrist and hand level S66.326 Laceration of extensor muscle, fascia and tendon of right little finger at wrist and hand level S66.327 Laceration of extensor muscle, fascia and tendon of left little finger at wrist and hand level S66.328 Laceration of extensor muscle, fascia and tendon of other finger at wrist and hand level S66.329 Laceration of extensor muscle, fascia and tendon of unspecified finger at wrist and hand level 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 S66.401 Unspecified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level S66.402 Unspecified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level S66.409 Unspecified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.411 Strain of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level S66.412 Strain of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level S66.419 Strain of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.421 Laceration of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level S66.422 Laceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level S66.429 Laceration of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.491 Other specified injury of intrinsic muscle, fascia and tendon of right thumb at wrist and hand level S66.492 Other specified injury of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level S66.499 Other specified injury of intrinsic muscle, fascia and tendon of unspecified thumb at wrist and hand level S66.500 Unspecified injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level S66.501 Unspecified injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level S66.502 Unspecified injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level S66.503 Unspecified injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level S66.504 Unspecified injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level S66.505 Unspecified injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level S66.506 Unspecified injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level S66.507 Unspecified injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level S66.508 Unspecified injury of intrinsic muscle, fascia and tendon of other finger at wrist and hand level S66.509 Unspecified injury of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level S66.510 Strain of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level S66.511 Strain of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level S66.512 Strain of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level S66.513 Strain of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level S66.514 Strain of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level S66.515 Strain of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level S66.516 Strain of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level S66.517 Strain of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level S66.518 Strain of intrinsic muscle, fascia and tendon of other finger at wrist and hand level S66.519 Strain of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level S66.520 Laceration of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level S66.521 Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level S66.522 Laceration of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level S66.523 Laceration of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level S66.524 Laceration of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level S66.525 Laceration of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level S66.526 Laceration of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level S66.527 Laceration of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level S66.528 Laceration of intrinsic muscle, fascia and tendon of other finger at wrist and hand level S66.529 Laceration of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level S66.590 Other injury of intrinsic muscle, fascia and tendon of right index finger at wrist and hand level S66.591 Other injury of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level S66.592 Other injury of intrinsic muscle, fascia and tendon of right middle finger at wrist and hand level S66.593 Other injury of intrinsic muscle, fascia and tendon of left middle finger at wrist and hand level S66.594 Other injury of intrinsic muscle, fascia and tendon of right ring finger at wrist and hand level S66.595 Other injury of intrinsic muscle, fascia and tendon of left ring finger at wrist and hand level S66.596 Other injury of intrinsic muscle, fascia and tendon of right little finger at wrist and hand level S66.597 Other injury of intrinsic muscle, fascia and tendon of left little finger at wrist and hand level S66.598 Other injury of intrinsic muscle, fascia and tendon of other finger at wrist and hand level S66.599 Other injury of intrinsic muscle, fascia and tendon of unspecified finger at wrist and hand level S66.801 Unspecified injury of other specified muscles, fascia and tendons at wrist and hand level, right hand S66.802 Unspecified injury of other specified muscles, fascia and tendons at wrist and hand level, left hand S66.809 Unspecified injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand S66.811 Strain of other specified muscles, fascia and tendons at wrist and hand level, right hand S66.812 Strain of other specified muscles, fascia and tendons at wrist and hand level, left hand S66.819 Strain of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand S66.821 Laceration of other specified muscles, fascia and tendons at wrist and hand level, right hand S66.822 Laceration of other specified muscles, fascia and tendons at wrist and hand level, left hand S66.829 Laceration of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand S66.891 Other injury of other specified muscles, fascia and tendons at wrist and hand level, right hand S66.892 Other injury of other specified muscles, fascia and tendons at wrist and hand level, left hand S66.899 Other injury of other specified muscles, fascia and tendons at wrist and hand level, unspecified hand S66.901 Unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, right hand S66.902 Unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand S66.909 Unspecified injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand S66.911 Strain of unspecified muscle, fascia and tendon at wrist and hand level, right hand S66.912 Strain of unspecified muscle, fascia and tendon at wrist and hand level, left hand S66.919 Strain of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand S66.921 Laceration of unspecified muscle, fascia and tendon at wrist and hand level, right hand S66.922 Laceration of unspecified muscle, fascia and tendon at wrist and hand level, left hand S66.929 Laceration of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand S66.991 Other injury of unspecified muscle, fascia and tendon at wrist and hand level, right hand S66.992 Other injury of unspecified muscle, fascia and tendon at wrist and hand level, left hand S66.999 Other injury of unspecified muscle, fascia and tendon at wrist and hand level, unspecified hand
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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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