Version 2024

2024 ICD-10-CM Diagnosis Code S66.118

Strain of flexor muscle, fascia and tendon of other finger at wrist and hand level

ICD-10-CM Code:
S66.118
ICD-10 Code for:
Strain of flexor musc/fasc/tend finger at wrs/hnd lv
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Injuries to the wrist, hand and fingers
      (S60-S69)
      • Injury of muscle, fascia and tendon at wrist and hand level
        (S66)

S66.118 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of strain of flexor muscle, fascia and tendon of other finger at wrist and hand level. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Specific Coding Applicable to Strain of flexor musc/fasc/tend finger at wrs/hnd lv

Non-specific codes like S66.118 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for strain of flexor musc/fasc/tend finger at wrs/hnd lv:

  • Use S66.118A for initial encounter - BILLABLE CODE

  • Use S66.118D for subsequent encounter - BILLABLE CODE

  • Use S66.118S for sequela - BILLABLE CODE

Coding Guidelines

The appropriate 7th character is to be added to each code from block Injury of muscle, fascia and tendon at wrist and hand level (S66). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Strain of flexor muscle, fascia and tendon of specified finger with unspecified laterality at wrist and hand level

Patient Education


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 (broken bones), 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

[Learn More in MedlinePlus]

Sprains and Strains

A sprain is a stretched or torn ligament. Ligaments are tissues that connect bones at a joint. Falling, twisting, or getting hit can all cause a sprain. Ankle and wrist sprains are common. Symptoms include pain, swelling, bruising, and being unable to move your joint. You might feel a pop or tear when the injury happens.

A strain is a stretched or torn muscle or tendon. Tendons are tissues that connect muscle to bone. Twisting or pulling these tissues can cause a strain. Strains can happen suddenly or develop over time. Back and hamstring muscle strains are common. Many people get strains playing sports. Symptoms include pain, muscle spasms, swelling, and trouble moving the muscle.

At first, treatment of both sprains and strains usually involves resting the injured area, icing it, wearing a bandage or device that compresses the area, and medicines. Later treatment might include exercise and physical therapy.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


[Learn More in MedlinePlus]

Wrist Injuries and Disorders

Your wrist connects your hand to your forearm. It is not one big joint; it has several small joints. This makes it flexible and allows you to move your hand in different ways. The wrist has two big forearm bones and eight small bones known as carpals. It also has tendons and ligaments, which are connective tissues. Tendons connect muscles to bones. Ligaments connect bones to each other.

What are the types of wrist injuries and disorders?

Some of the more common types of wrist injuries and disorders are:

  • Carpal tunnel syndrome, which happens when a nerve that runs from your forearm into your palm becomes squeezed at the wrist
  • Ganglion cysts, which are noncancerous lumps or masses
  • Gout, which is a form of arthritis caused by a buildup of uric acid in your joints
  • Fractures (broken bones)
  • Osteoarthritis, the most common type of arthritis. It is caused by wear and tear of the joints.
  • Sprains and strains, which are injuries to ligaments and injuries to muscles or tendons
  • Tendinitis, inflammation of a tendon, usually due to overuse

Who is at risk for wrist injuries and disorders?

Certain things can put you at higher risk of having a wrist problem, including:

  • Doing sports, which can put you at risk for injuries and puts stress on your wrist. For example, you may fall on your outstretched hand when you are skating or snowboarding. Your wrist could be injured while doing contact sports. And other sports such as gymnastics and basketball can strain your wrists.
  • Doing repetitive wrist motions, such as typing on a keyboard, working on an assembly line, or using power tools.
  • Having certain diseases. For example, rheumatoid arthritis can cause wrist pain.

What are the symptoms of wrist injuries and disorders?

The symptoms of a wrist problem can vary, depending on the problem. A common symptom is wrist pain. Some other possible symptoms include swelling, a decrease in wrist strength, and sudden numbness or tingling.

How are wrist injuries and disorders diagnosed?

Your health care provider may use many tools to make a diagnosis:

  • A medical history, which includes asking about your symptoms
  • A physical exam, including checking your wrist strength and range of motion
  • An x-ray or other imaging test
  • Blood tests

What are the treatments for wrist injuries and disorders?

Treatments for wrist pain depends on the type of injury or disorder. They may include:

  • Resting your wrist
  • Wearing a wrist brace or cast
  • Pain relievers
  • Cortisone shots
  • Physical therapy
  • Surgery

Can wrist injuries and disorders be prevented?

To try to prevent wrist problems, you can:

  • Use wrist guards, when doing sports that put you at risk for wrist injuries
  • In the workplace, perform stretching exercises and take frequent rest breaks. You should also pay attention to ergonomics to make sure that you are using the proper wrist position while working.
  • Make sure that you get enough calcium and vitamin D to keep your bones strong

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.