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  6. 2024 ICD-10-CM Code S56.4

2024 ICD-10-CM Diagnosis Code S56.4

Injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level

ICD-10-CM Code:
S56.4
ICD-10 Code for:
Inj extensor musc/fasc/tend and unsp finger at forarm 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 elbow and forearm
      (S50-S59)
      • Injury of muscle, fascia and tendon at forearm level
        (S56)

S56.4 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm 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.

Unspecified diagnosis codes like S56.4 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to Inj extensor musc/fasc/tend and unsp finger at forarm lv

Non-specific codes like S56.4 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 inj extensor musc/fasc/tend and unsp finger at forarm lv:

  • S56.40 for Unspecified injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level - NON-BILLABLE CODE

  • S56.401 for Unspecified injury of extensor muscle, fascia and tendon of right index finger at forearm level - NON-BILLABLE CODE

  • Use S56.401A for initial encounter - BILLABLE CODE

  • Use S56.401D for subsequent encounter - BILLABLE CODE

  • Use S56.401S for sequela - BILLABLE CODE

  • S56.402 for Unspecified injury of extensor muscle, fascia and tendon of left index finger at forearm level - NON-BILLABLE CODE

  • Use S56.402A for initial encounter - BILLABLE CODE

  • Use S56.402D for subsequent encounter - BILLABLE CODE

  • Use S56.402S for sequela - BILLABLE CODE

  • S56.403 for Unspecified injury of extensor muscle, fascia and tendon of right middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.403A for initial encounter - BILLABLE CODE

  • Use S56.403D for subsequent encounter - BILLABLE CODE

  • Use S56.403S for sequela - BILLABLE CODE

  • S56.404 for Unspecified injury of extensor muscle, fascia and tendon of left middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.404A for initial encounter - BILLABLE CODE

  • Use S56.404D for subsequent encounter - BILLABLE CODE

  • Use S56.404S for sequela - BILLABLE CODE

  • S56.405 for Unspecified injury of extensor muscle, fascia and tendon of right ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.405A for initial encounter - BILLABLE CODE

  • Use S56.405D for subsequent encounter - BILLABLE CODE

  • Use S56.405S for sequela - BILLABLE CODE

  • S56.406 for Unspecified injury of extensor muscle, fascia and tendon of left ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.406A for initial encounter - BILLABLE CODE

  • Use S56.406D for subsequent encounter - BILLABLE CODE

  • Use S56.406S for sequela - BILLABLE CODE

  • S56.407 for Unspecified injury of extensor muscle, fascia and tendon of right little finger at forearm level - NON-BILLABLE CODE

  • Use S56.407A for initial encounter - BILLABLE CODE

  • Use S56.407D for subsequent encounter - BILLABLE CODE

  • Use S56.407S for sequela - BILLABLE CODE

  • S56.408 for Unspecified injury of extensor muscle, fascia and tendon of left little finger at forearm level - NON-BILLABLE CODE

  • Use S56.408A for initial encounter - BILLABLE CODE

  • Use S56.408D for subsequent encounter - BILLABLE CODE

  • Use S56.408S for sequela - BILLABLE CODE

  • S56.409 for Unspecified injury of extensor muscle, fascia and tendon of unspecified finger at forearm level - NON-BILLABLE CODE

  • Use S56.409A for initial encounter - BILLABLE CODE

  • Use S56.409D for subsequent encounter - BILLABLE CODE

  • Use S56.409S for sequela - BILLABLE CODE

  • S56.41 for Strain of extensor muscle, fascia and tendon of other and unspecified finger at forearm level - NON-BILLABLE CODE

  • S56.411 for Strain of extensor muscle, fascia and tendon of right index finger at forearm level - NON-BILLABLE CODE

  • Use S56.411A for initial encounter - BILLABLE CODE

  • Use S56.411D for subsequent encounter - BILLABLE CODE

  • Use S56.411S for sequela - BILLABLE CODE

  • S56.412 for Strain of extensor muscle, fascia and tendon of left index finger at forearm level - NON-BILLABLE CODE

  • Use S56.412A for initial encounter - BILLABLE CODE

  • Use S56.412D for subsequent encounter - BILLABLE CODE

  • Use S56.412S for sequela - BILLABLE CODE

  • S56.413 for Strain of extensor muscle, fascia and tendon of right middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.413A for initial encounter - BILLABLE CODE

  • Use S56.413D for subsequent encounter - BILLABLE CODE

  • Use S56.413S for sequela - BILLABLE CODE

  • S56.414 for Strain of extensor muscle, fascia and tendon of left middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.414A for initial encounter - BILLABLE CODE

  • Use S56.414D for subsequent encounter - BILLABLE CODE

  • Use S56.414S for sequela - BILLABLE CODE

  • S56.415 for Strain of extensor muscle, fascia and tendon of right ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.415A for initial encounter - BILLABLE CODE

  • Use S56.415D for subsequent encounter - BILLABLE CODE

  • Use S56.415S for sequela - BILLABLE CODE

  • S56.416 for Strain of extensor muscle, fascia and tendon of left ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.416A for initial encounter - BILLABLE CODE

  • Use S56.416D for subsequent encounter - BILLABLE CODE

  • Use S56.416S for sequela - BILLABLE CODE

  • S56.417 for Strain of extensor muscle, fascia and tendon of right little finger at forearm level - NON-BILLABLE CODE

  • Use S56.417A for initial encounter - BILLABLE CODE

  • Use S56.417D for subsequent encounter - BILLABLE CODE

  • Use S56.417S for sequela - BILLABLE CODE

  • S56.418 for Strain of extensor muscle, fascia and tendon of left little finger at forearm level - NON-BILLABLE CODE

  • Use S56.418A for initial encounter - BILLABLE CODE

  • Use S56.418D for subsequent encounter - BILLABLE CODE

  • Use S56.418S for sequela - BILLABLE CODE

  • S56.419 for Strain of extensor muscle, fascia and tendon of finger, unspecified finger at forearm level - NON-BILLABLE CODE

  • Use S56.419A for initial encounter - BILLABLE CODE

  • Use S56.419D for subsequent encounter - BILLABLE CODE

  • Use S56.419S for sequela - BILLABLE CODE

  • S56.42 for Laceration of extensor muscle, fascia and tendon of other and unspecified finger at forearm level - NON-BILLABLE CODE

  • S56.421 for Laceration of extensor muscle, fascia and tendon of right index finger at forearm level - NON-BILLABLE CODE

  • Use S56.421A for initial encounter - BILLABLE CODE

  • Use S56.421D for subsequent encounter - BILLABLE CODE

  • Use S56.421S for sequela - BILLABLE CODE

  • S56.422 for Laceration of extensor muscle, fascia and tendon of left index finger at forearm level - NON-BILLABLE CODE

  • Use S56.422A for initial encounter - BILLABLE CODE

  • Use S56.422D for subsequent encounter - BILLABLE CODE

  • Use S56.422S for sequela - BILLABLE CODE

  • S56.423 for Laceration of extensor muscle, fascia and tendon of right middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.423A for initial encounter - BILLABLE CODE

  • Use S56.423D for subsequent encounter - BILLABLE CODE

  • Use S56.423S for sequela - BILLABLE CODE

  • S56.424 for Laceration of extensor muscle, fascia and tendon of left middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.424A for initial encounter - BILLABLE CODE

  • Use S56.424D for subsequent encounter - BILLABLE CODE

  • Use S56.424S for sequela - BILLABLE CODE

  • S56.425 for Laceration of extensor muscle, fascia and tendon of right ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.425A for initial encounter - BILLABLE CODE

  • Use S56.425D for subsequent encounter - BILLABLE CODE

  • Use S56.425S for sequela - BILLABLE CODE

  • S56.426 for Laceration of extensor muscle, fascia and tendon of left ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.426A for initial encounter - BILLABLE CODE

  • Use S56.426D for subsequent encounter - BILLABLE CODE

  • Use S56.426S for sequela - BILLABLE CODE

  • S56.427 for Laceration of extensor muscle, fascia and tendon of right little finger at forearm level - NON-BILLABLE CODE

  • Use S56.427A for initial encounter - BILLABLE CODE

  • Use S56.427D for subsequent encounter - BILLABLE CODE

  • Use S56.427S for sequela - BILLABLE CODE

  • S56.428 for Laceration of extensor muscle, fascia and tendon of left little finger at forearm level - NON-BILLABLE CODE

  • Use S56.428A for initial encounter - BILLABLE CODE

  • Use S56.428D for subsequent encounter - BILLABLE CODE

  • Use S56.428S for sequela - BILLABLE CODE

  • S56.429 for Laceration of extensor muscle, fascia and tendon of unspecified finger at forearm level - NON-BILLABLE CODE

  • Use S56.429A for initial encounter - BILLABLE CODE

  • Use S56.429D for subsequent encounter - BILLABLE CODE

  • Use S56.429S for sequela - BILLABLE CODE

  • S56.49 for Other injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level - NON-BILLABLE CODE

  • S56.491 for Other injury of extensor muscle, fascia and tendon of right index finger at forearm level - NON-BILLABLE CODE

  • Use S56.491A for initial encounter - BILLABLE CODE

  • Use S56.491D for subsequent encounter - BILLABLE CODE

  • Use S56.491S for sequela - BILLABLE CODE

  • S56.492 for Other injury of extensor muscle, fascia and tendon of left index finger at forearm level - NON-BILLABLE CODE

  • Use S56.492A for initial encounter - BILLABLE CODE

  • Use S56.492D for subsequent encounter - BILLABLE CODE

  • Use S56.492S for sequela - BILLABLE CODE

  • S56.493 for Other injury of extensor muscle, fascia and tendon of right middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.493A for initial encounter - BILLABLE CODE

  • Use S56.493D for subsequent encounter - BILLABLE CODE

  • Use S56.493S for sequela - BILLABLE CODE

  • S56.494 for Other injury of extensor muscle, fascia and tendon of left middle finger at forearm level - NON-BILLABLE CODE

  • Use S56.494A for initial encounter - BILLABLE CODE

  • Use S56.494D for subsequent encounter - BILLABLE CODE

  • Use S56.494S for sequela - BILLABLE CODE

  • S56.495 for Other injury of extensor muscle, fascia and tendon of right ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.495A for initial encounter - BILLABLE CODE

  • Use S56.495D for subsequent encounter - BILLABLE CODE

  • Use S56.495S for sequela - BILLABLE CODE

  • S56.496 for Other injury of extensor muscle, fascia and tendon of left ring finger at forearm level - NON-BILLABLE CODE

  • Use S56.496A for initial encounter - BILLABLE CODE

  • Use S56.496D for subsequent encounter - BILLABLE CODE

  • Use S56.496S for sequela - BILLABLE CODE

  • S56.497 for Other injury of extensor muscle, fascia and tendon of right little finger at forearm level - NON-BILLABLE CODE

  • Use S56.497A for initial encounter - BILLABLE CODE

  • Use S56.497D for subsequent encounter - BILLABLE CODE

  • Use S56.497S for sequela - BILLABLE CODE

  • S56.498 for Other injury of extensor muscle, fascia and tendon of left little finger at forearm level - NON-BILLABLE CODE

  • Use S56.498A for initial encounter - BILLABLE CODE

  • Use S56.498D for subsequent encounter - BILLABLE CODE

  • Use S56.498S for sequela - BILLABLE CODE

  • S56.499 for Other injury of extensor muscle, fascia and tendon of unspecified finger at forearm level - NON-BILLABLE CODE

  • Use S56.499A for initial encounter - BILLABLE CODE

  • Use S56.499D for subsequent encounter - BILLABLE CODE

  • Use S56.499S 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 forearm level (S56). Use the following options for the aplicable episode of care:

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

Patient Education


Arm Injuries and Disorders

Of the 206 bones in your body, three of them are in your arm: the humerus, radius, and ulna. Your arms are also made up of muscles, joints, tendons, and other connective tissue. Injuries to any of these parts of the arm can occur during sports, a fall, or an accident.

Types of arm injuries include :

  • Tendinitis and bursitis
  • Sprains
  • Dislocations
  • Fractures (broken bones)
  • Nerve problems
  • Osteoarthritis

You may also have problems or injure specific parts of your arm, such as your hand, wrist, elbow, or shoulder.


[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.