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ICD-10-CM 2027 diagnosis code

S55.91Laceration of unspecified blood vessel at forearm level

Not billable — use a more specific codeRequires 7th character

S55.91 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S55.91

S55.91 is the ICD-10-CM diagnosis code for laceration of unspecified blood vessel at forearm level. It belongs to category S55 (injury of blood vessels at forearm level), block S50-S59 (injuries to the elbow and forearm) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S55.9, choose S55.91 (Laceration of unspecified blood vessel at forearm level) only when documentation doesn't support a more specific option: unspecified injury of unspecified blood vessel at forearm level (S55.90) and other specified injury of unspecified blood vessel at forearm level (S55.99).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

7th character

The appropriate 7th character is to be added to each code from category S55

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Notes that apply from higher levels

Instructions written at a parent level also apply to S55.91.

› From S55 Injury of blood vessels at forearm level
Excludes2
  • injury of blood vessels at wrist and hand level (S65.-)
  • injury of brachial vessels (S45.1-S45.2)
Code also
  • any associated open wound (S51.-)

Broader instructions also apply from S50-S59 Injuries to the elbow and forearm and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to S55.91.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about S55.91

Is S55.91 billable?

No. S55.91 is a header code. Report one of its more specific subcodes instead.