S55.999Header code — not billable

Other specified injury of unspecified blood vessel at forearm level, unspecified arm

Short description: Oth injury of unsp blood vessel at forearm level, unsp arm

Chapter
19. Injury, poisoning and certain other consequences of external causes
Category
S55
Effective date
October 1, 2026

Related codes in category S55

S55Injury of blood vessels at forearm levelS55.0Injury of ulnar artery at forearm levelS55.00Unspecified injury of ulnar artery at forearm levelS55.001Unsp injury of ulnar artery at forearm level, right armS55.001AUnsp injury of ulnar artery at forarm lv, right arm, initYesS55.001DUnsp injury of ulnar artery at forarm lv, right arm, subsYesS55.001SUnsp injury of ulnar artery at forarm lv, right arm, sequelaYesS55.002Unsp injury of ulnar artery at forearm level, left armS55.002AUnsp injury of ulnar artery at forearm level, left arm, initYesS55.002DUnsp injury of ulnar artery at forearm level, left arm, subsYesS55.002SUnsp injury of ulnar artery at forarm lv, left arm, sequelaYesS55.009Unsp injury of ulnar artery at forearm level, unsp arm

Frequently asked questions

What is ICD-10 code S55.999?

S55.999 is an ICD-10-CM diagnosis code for Other specified injury of unspecified blood vessel at forearm level, unspecified arm.

Is S55.999 a billable code?

No. S55.999 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 S55.999 in?

S55.999 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.

When did S55.999 become effective?

S55.999 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to S55.999?

S55.999 belongs to category S55, 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.