2026 ICD-10-CM Diagnosis Code S56Injury of muscle, fascia and tendon at forearm level

ICD-10-CM Codes›S00–T88›S50-S59›S56

ICD-10-CM S56
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S56 is a non-billable ICD-10-CM category code for injury of muscle, fascia and tendon at forearm level, so it cannot be submitted on claims. Use a more specific code from this category instead, such as S56.001A, S56.001D, S56.001S, and S56.002A.

Code Identity

ICD-10-CM Code
S56
Billable Status
No — Non-Billable Category
Code Describes
Injury of muscle, fascia and tendon at forearm level
Short Description
Injury of muscle, fascia and tendon at forearm level
Same as the full description in the CMS dataset.
Chapter
S50-S59
Injuries to the elbow and forearm

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS50-S59Injuries to the elbow and forearm
CategoryS56Injury of muscle, fascia and tendon at forearm level
This CodeS56Injury of muscle, fascia and tendon at forearm level

Specific Coding for Injury of muscle, fascia and tendon at forearm levelOverview

Non-specific codes like S56 require more characters. Use one of these billable codes instead:

  • S56.0 for Injury of flexor muscle, fascia and tendon of thumb at forearm level

  • S56.00 for Unspecified injury of flexor muscle, fascia and tendon of thumb at forearm level

  • S56.01 for Strain of flexor muscle, fascia and tendon of thumb at forearm level

  • S56.02 for Laceration of flexor muscle, fascia and tendon of thumb at forearm level

  • S56.09 for Other injury of flexor muscle, fascia and tendon of thumb at forearm level

  • S56.1 for Injury of flexor muscle, fascia and tendon of other and unspecified finger at forearm level

  • S56.10 for Unspecified injury of flexor muscle, fascia and tendon of other and unspecified finger at forearm level

  • S56.11 for Strain of flexor muscle, fascia and tendon of other and unspecified finger at forearm level

  • S56.12 for Laceration of flexor muscle, fascia and tendon of other and unspecified finger at forearm level

  • S56.19 for Other injury of flexor muscle, fascia and tendon of other and unspecified finger at forearm level

  • S56.2 for Injury of other flexor muscle, fascia and tendon at forearm level

  • S56.20 for Unspecified injury of other flexor muscle, fascia and tendon at forearm level

  • S56.21 for Strain of other flexor muscle, fascia and tendon at forearm level

  • S56.22 for Laceration of other flexor muscle, fascia and tendon at forearm level

  • S56.29 for Other injury of other flexor muscle, fascia and tendon at forearm level

  • S56.3 for Injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level

  • S56.30 for Unspecified injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level

  • S56.31 for Strain of extensor or abductor muscles, fascia and tendons of thumb at forearm level

  • S56.32 for Laceration of extensor or abductor muscles, fascia and tendons of thumb at forearm level

  • S56.39 for Other injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level

  • S56.4 for Injury of extensor muscle, fascia and tendon of other and unspecified finger at forearm level

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

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

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

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

  • S56.5 for Injury of other extensor muscle, fascia and tendon at forearm level

  • S56.50 for Unspecified injury of other extensor muscle, fascia and tendon at forearm level

  • S56.51 for Strain of other extensor muscle, fascia and tendon at forearm level

  • S56.52 for Laceration of other extensor muscle, fascia and tendon at forearm level

  • S56.59 for Other injury of other extensor muscle, fascia and tendon at forearm level

  • S56.8 for Injury of other muscles, fascia and tendons at forearm level

  • S56.80 for Unspecified injury of other muscles, fascia and tendons at forearm level

  • S56.81 for Strain of other muscles, fascia and tendons at forearm level

  • S56.82 for Laceration of other muscles, fascia and tendons at forearm level

  • S56.89 for Other injury of other muscles, fascia and tendons at forearm level

  • S56.9 for Injury of unspecified muscles, fascia and tendons at forearm level

  • S56.90 for Unspecified injury of unspecified muscles, fascia and tendons at forearm level

  • S56.91 for Strain of unspecified muscles, fascia and tendons at forearm level

  • S56.92 for Laceration of unspecified muscles, fascia and tendons at forearm level

  • S56.99 for Other injury of unspecified muscles, fascia and tendons at forearm level

Coding GuidelinesGuidance

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 applicable episode of care:

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

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Code Also

  • any associated open wound S51

Type 2 Excludes

  • injury of muscle, fascia and tendon at or below wrist S66
  • sprain of joints and ligaments of elbow S53.4

7th Character Note

  • The appropriate 7th character is to be added to each code from category S56

7th Character

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

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S56Overview

Is S56 (Injury of muscle, fascia and tendon at forearm level) a billable code?

No. This is a category header that groups the codes for injury of muscle, fascia and tendon at forearm level, and headers cannot be submitted on claims. Claims for injury of muscle, fascia and tendon at forearm level need a more specific code from this category, such as S56.001A, S56.001D, and S56.001S.