S56.999Header code — not billable

Other injury of unspecified muscles, fascia and tendons at forearm level, unspecified arm

Short description: Inj unsp musc/fasc/tend at forearm level, unsp arm

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
S56
Effective date
October 1, 2026

Related codes in category S56

S56Injury of muscle, fascia and tendon at forearm levelS56.0Injury of flexor musc/fasc/tend thumb at forearm levelS56.00Unsp injury of flexor musc/fasc/tend thumb at forearm levelS56.001Unsp injury of flexor musc/fasc/tend r thm at forarm lvS56.001AUnsp inj flexor musc/fasc/tend r thm at forarm lv, initYesS56.001DUnsp inj flexor musc/fasc/tend r thm at forarm lv, subsYesS56.001SUnsp inj flexor musc/fasc/tend r thm at forarm lv, sequelaYesS56.002Unsp injury of flexor musc/fasc/tend left thumb at forarm lvS56.002AUnsp inj flexor musc/fasc/tend l thm at forarm lv, initYesS56.002DUnsp inj flexor musc/fasc/tend l thm at forarm lv, subsYesS56.002SUnsp inj flexor musc/fasc/tend l thm at forarm lv, sequelaYesS56.009Unsp injury of flexor musc/fasc/tend thmb at forearm level

Frequently asked questions

What is ICD-10 code S56.999?

S56.999 is an ICD-10-CM diagnosis code for Other injury of unspecified muscles, fascia and tendons at forearm level, unspecified arm.

Is S56.999 a billable code?

No. S56.999 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is S56.999 in?

S56.999 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did S56.999 become effective?

S56.999 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to S56.999?

S56.999 belongs to category S56, which includes 12 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.