S56.909D Unspecified injury of unspecified muscles, fascia and tendons at forearm level, unspecified arm, subsequent encounter

ICD-10-CM S56.909D: Unspecified injury of unspecified muscles, fascia and tendons at forearm level, unspecified arm, subsequent encounter

ICD-10-CM code S56.909D identifies an unspecified injury of unspecified muscles, fascia, and tendons at the forearm level of an unspecified arm during a subsequent encounter. The terminology record classifies this concept under the semantic type of Injury or Poisoning and notes it has narrower concepts within the terminology. 1 3

Plain-language overview

Code S56.909D functions as an active ICD-10-CM terminology record representing an unspecified injury of unspecified muscles, fascia, and tendons at the forearm level of an unspecified arm during a subsequent encounter. 1

What this code represents

The semantic type assigned to code S56.909D within the ICD-10-CM terminology is Injury or Poisoning, establishing the clinical category for this specific diagnosis concept. 1

Within the ICD-10-CM hierarchy, S56.909D is a narrower concept of the parent code S56.909, which denotes an unspecified injury of unspecified muscles, fascia, and tendons at the forearm level of an unspecified arm. 1 4

Coding details

The official published abbreviation for S56.909D is Unsp inj unsp musc/fasc/tend at forarm lv, unsp arm, subs, reflecting the subsequent encounter and unspecified arm designations. 1

Code S56.909D appears alongside related forearm injury codes that specify laterality, such as S56.901D for the right arm and S56.902D for the left arm, distinguishing it as the unspecified arm option. 6

Documentation considerations

The official display label for S56.909D includes the phrase subsequent encounter, and the published abbreviation for this code concludes with the abbreviation subs. 1

The official display label for S56.909D specifies an unspecified arm and unspecified muscles, fascia, and tendons, and related codes list distinct options for the right and left arm. 1 6

What the sources add

While the S56.909D terminology record defines the diagnosis, National Health Statistics Reports establish a broader operational context by classifying muscle, fascia, and tendon injuries within a specific nature-of-injury matrix category. 1 2

National Health Statistics Reports place injuries to muscles and tendons into the Other specified injury category of the ICD-10-CM injury diagnosis matrix, separate from strains, sprains, and nerve injuries. 2

Sources

1. ICD-10-CM S56.909D terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. National Health Statistics Reports — cdc.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
5. CHAPTER 16: MUSCLE, FASCIA, AND TENDON INJURIES — chiro.org; accessed 2026-07-27.
6. ICD-10-CM 2024 | S56 - Injury of muscle, fascia and tendon at forearm level — unboundmedicine.com; accessed 2026-07-27.