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ICD10BillableValid for clinical use

ICD-10 Code S66.393: Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level

S66.393 is a billable ICD-10 diagnosis code used to classify Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Injury, poisoning and certain other consequences of external causes (S00-T88).

When is it used?

  • May be used when a clinician documents other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
19Injury, poisoning and certain other consequences of external causes (S00-T88)
block
S60-S69Injuries to the wrist, hand and fingers
category
S66Injury of muscle, fascia and tendon at wrist and hand level
category
S66.3Injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
category
S66.39Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level
currentS66.39

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Emergency Medicine SpecialistOrthopedic Specialist

Related codes

S66.390Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand levelcodeS66.391Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand levelcodeS66.392Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand levelcodeS66.394Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand levelcodeS66.395Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand levelcodeS66.396Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand levelcodeS66.397Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand levelcodeS66.398Other injury of extensor muscle, fascia and tendon of other finger at wrist and hand levelcodeS66.399Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand levelcode

Sibling codes

S66.390Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand levelbillableS66.391Other injury of extensor muscle, fascia and tendon of left index finger at wrist and hand levelbillableS66.392Other injury of extensor muscle, fascia and tendon of right middle finger at wrist and hand levelbillableS66.394Other injury of extensor muscle, fascia and tendon of right ring finger at wrist and hand levelbillableS66.395Other injury of extensor muscle, fascia and tendon of left ring finger at wrist and hand levelbillableS66.396Other injury of extensor muscle, fascia and tendon of right little finger at wrist and hand levelbillableS66.397Other injury of extensor muscle, fascia and tendon of left little finger at wrist and hand levelbillableS66.398Other injury of extensor muscle, fascia and tendon of other finger at wrist and hand levelbillableS66.399Other injury of extensor muscle, fascia and tendon of unspecified finger at wrist and hand levelbillable

Coding guidelines

Common synonyms

Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level

Frequently asked questions

Code details

CodeS66.393
SystemICD10
Display nameOther injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level
ChapterInjury, poisoning and certain other consequences of external causes (S00-T88)
BlockInjuries to the wrist, hand and fingers

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code S66.393 for Other injury of extensor muscle, fascia and tendon of left middle finger at wrist and hand level | HealthAssure