ICD-10 Diagnosis Code S66.103A

Unsp inj flxr musc/fasc/tend l mid fngr at wrs/hnd lv, init

Diagnosis Code S66.103A

ICD-10: S66.103A
Short Description: Unsp inj flxr musc/fasc/tend l mid fngr at wrs/hnd lv, init
Long Description: Unspecified injury of flexor muscle, fascia and tendon of left middle finger at wrist and hand level, initial encounter
This is the 2018 version of the ICD-10-CM diagnosis code S66.103A

Valid for Submission
The code S66.103A is valid for submission for HIPAA-covered transactions.

Code Classification
  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Injuries to the wrist, hand and fingers (S60-S69)
      • Injury of muscle, fascia and tendon at wrist and hand level (S66)

Information for Patients


Hand Injuries and Disorders

No matter how old you are or what you do for a living, you are always using your hands. When there is something wrong with them, you may not be able to do your regular activities.

Hand problems include

  • Carpal tunnel syndrome - compression of a nerve as it goes through the wrist, often making your fingers feel numb
  • Injuries that result in fractures, ruptured ligaments and dislocations
  • Osteoarthritis - wear-and-tear arthritis, which can also cause deformity
  • Tendinitis - irritation of the tendons
  • Disorders and injuries of your fingers and thumb

  • Brachial plexopathy (Medical Encyclopedia)
  • Claw hand (Medical Encyclopedia)
  • Dupuytrens contracture (Medical Encyclopedia)
  • Hand fracture - aftercare (Medical Encyclopedia)
  • Hand or foot spasms (Medical Encyclopedia)
  • Hand x-ray (Medical Encyclopedia)
  • Radial nerve dysfunction (Medical Encyclopedia)
  • Ulnar nerve dysfunction (Medical Encyclopedia)


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Wrist Injuries and Disorders

Your wrist is made up of eight small bones known as carpals. They support a tube that runs through your wrist. That tube, called the carpal tunnel, has tendons and a nerve inside. It is covered by a ligament, which holds it in place.

Wrist pain is common. Repetitive motion can damage your wrist. Everyday activities like typing, racquet sports or sewing can cause pain, or even carpal tunnel syndrome. Wrist pain with bruising and swelling can be a sign of injury. The signs of a possible fracture include misshapen joints and inability to move your wrist. Some wrist fractures are a result of osteoporosis.

Other common causes of pain are

  • Sprains and strains
  • Tendinitis
  • Arthritis
  • Gout and pseudogout

  • Colles wrist fracture - aftercare (Medical Encyclopedia)
  • De Quervain tendinitis (Medical Encyclopedia)
  • Wrist arthroscopy (Medical Encyclopedia)
  • Wrist pain (Medical Encyclopedia)
  • Wrist sprain - aftercare (Medical Encyclopedia)


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