ICD-10-CM Tabular Index · Chapter 19 · FY 2026 S55

Injury of blood vessels at forearm level (S55) ICD-10-CM

The S55 code range covers injury of blood vessels at forearm level with 201 ICD-10-CM diagnosis codes. 135 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.

✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
201
Diagnosis Codes
135
Billable Codes
S55
Code Range
S50–S59
Parent Section

Code Also

A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

7th Character Note

Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.

7th Character

Indicates that a seventh character is to be assigned to codes in a subcategory.

ICD-10-CM

Codes in the S55 Range 201 codes · 135 billable

201 of 201 shown
  • S55 Injury of blood vessels at forearm levelNon-billable
  • S55.0 Injury of ulnar artery at forearm levelNon-billable
  • S55.00 Unspecified injury of ulnar artery at forearm levelNon-billable
  • S55.001 Unspecified injury of ulnar artery at forearm level, right armNon-billable
  • S55.001A Unspecified injury of ulnar artery at forearm level, right arm, initial encounter
  • S55.001D Unspecified injury of ulnar artery at forearm level, right arm, subsequent encounter
  • S55.001S Unspecified injury of ulnar artery at forearm level, right arm, sequela
  • S55.002 Unspecified injury of ulnar artery at forearm level, left armNon-billable
  • S55.002A Unspecified injury of ulnar artery at forearm level, left arm, initial encounter
  • S55.002D Unspecified injury of ulnar artery at forearm level, left arm, subsequent encounter
  • S55.002S Unspecified injury of ulnar artery at forearm level, left arm, sequela
  • S55.009 Unspecified injury of ulnar artery at forearm level, unspecified armNon-billable
  • S55.009A Unspecified injury of ulnar artery at forearm level, unspecified arm, initial encounter
  • S55.009D Unspecified injury of ulnar artery at forearm level, unspecified arm, subsequent encounter
  • S55.009S Unspecified injury of ulnar artery at forearm level, unspecified arm, sequela
  • S55.01 Laceration of ulnar artery at forearm levelNon-billable
  • S55.011 Laceration of ulnar artery at forearm level, right armNon-billable
  • S55.011A Laceration of ulnar artery at forearm level, right arm, initial encounter
  • S55.011D Laceration of ulnar artery at forearm level, right arm, subsequent encounter
  • S55.011S Laceration of ulnar artery at forearm level, right arm, sequela
  • S55.012 Laceration of ulnar artery at forearm level, left armNon-billable
  • S55.012A Laceration of ulnar artery at forearm level, left arm, initial encounter
  • S55.012D Laceration of ulnar artery at forearm level, left arm, subsequent encounter
  • S55.012S Laceration of ulnar artery at forearm level, left arm, sequela
  • S55.019 Laceration of ulnar artery at forearm level, unspecified armNon-billable
  • S55.019A Laceration of ulnar artery at forearm level, unspecified arm, initial encounter
  • S55.019D Laceration of ulnar artery at forearm level, unspecified arm, subsequent encounter
  • S55.019S Laceration of ulnar artery at forearm level, unspecified arm, sequela
  • S55.09 Other specified injury of ulnar artery at forearm levelNon-billable
  • S55.091 Other specified injury of ulnar artery at forearm level, right armNon-billable
  • S55.091A Other specified injury of ulnar artery at forearm level, right arm, initial encounter
  • S55.091D Other specified injury of ulnar artery at forearm level, right arm, subsequent encounter
  • S55.091S Other specified injury of ulnar artery at forearm level, right arm, sequela
  • S55.092 Other specified injury of ulnar artery at forearm level, left armNon-billable
  • S55.092A Other specified injury of ulnar artery at forearm level, left arm, initial encounter
  • S55.092D Other specified injury of ulnar artery at forearm level, left arm, subsequent encounter
  • S55.092S Other specified injury of ulnar artery at forearm level, left arm, sequela
  • S55.099 Other specified injury of ulnar artery at forearm level, unspecified armNon-billable
  • S55.099A Other specified injury of ulnar artery at forearm level, unspecified arm, initial encounter
  • S55.099D Other specified injury of ulnar artery at forearm level, unspecified arm, subsequent encounter
  • S55.099S Other specified injury of ulnar artery at forearm level, unspecified arm, sequela
  • S55.1 Injury of radial artery at forearm levelNon-billable
  • S55.10 Unspecified injury of radial artery at forearm levelNon-billable
  • S55.101 Unspecified injury of radial artery at forearm level, right armNon-billable
  • S55.101A Unspecified injury of radial artery at forearm level, right arm, initial encounter
  • S55.101D Unspecified injury of radial artery at forearm level, right arm, subsequent encounter
  • S55.101S Unspecified injury of radial artery at forearm level, right arm, sequela
  • S55.102 Unspecified injury of radial artery at forearm level, left armNon-billable
  • S55.102A Unspecified injury of radial artery at forearm level, left arm, initial encounter
  • S55.102D Unspecified injury of radial artery at forearm level, left arm, subsequent encounter
  • S55.102S Unspecified injury of radial artery at forearm level, left arm, sequela
  • S55.109 Unspecified injury of radial artery at forearm level, unspecified armNon-billable
  • S55.109A Unspecified injury of radial artery at forearm level, unspecified arm, initial encounter
  • S55.109D Unspecified injury of radial artery at forearm level, unspecified arm, subsequent encounter
  • S55.109S Unspecified injury of radial artery at forearm level, unspecified arm, sequela
  • S55.11 Laceration of radial artery at forearm levelNon-billable
  • S55.111 Laceration of radial artery at forearm level, right armNon-billable
  • S55.111A Laceration of radial artery at forearm level, right arm, initial encounter
  • S55.111D Laceration of radial artery at forearm level, right arm, subsequent encounter
  • S55.111S Laceration of radial artery at forearm level, right arm, sequela
  • S55.112 Laceration of radial artery at forearm level, left armNon-billable
  • S55.112A Laceration of radial artery at forearm level, left arm, initial encounter
  • S55.112D Laceration of radial artery at forearm level, left arm, subsequent encounter
  • S55.112S Laceration of radial artery at forearm level, left arm, sequela
  • S55.119 Laceration of radial artery at forearm level, unspecified armNon-billable
  • S55.119A Laceration of radial artery at forearm level, unspecified arm, initial encounter
  • S55.119D Laceration of radial artery at forearm level, unspecified arm, subsequent encounter
  • S55.119S Laceration of radial artery at forearm level, unspecified arm, sequela
  • S55.19 Other specified injury of radial artery at forearm levelNon-billable
  • S55.191 Other specified injury of radial artery at forearm level, right armNon-billable
  • S55.191A Other specified injury of radial artery at forearm level, right arm, initial encounter
  • S55.191D Other specified injury of radial artery at forearm level, right arm, subsequent encounter
  • S55.191S Other specified injury of radial artery at forearm level, right arm, sequela
  • S55.192 Other specified injury of radial artery at forearm level, left armNon-billable
  • S55.192A Other specified injury of radial artery at forearm level, left arm, initial encounter
  • S55.192D Other specified injury of radial artery at forearm level, left arm, subsequent encounter
  • S55.192S Other specified injury of radial artery at forearm level, left arm, sequela
  • S55.199 Other specified injury of radial artery at forearm level, unspecified armNon-billable
  • S55.199A Other specified injury of radial artery at forearm level, unspecified arm, initial encounter
  • S55.199D Other specified injury of radial artery at forearm level, unspecified arm, subsequent encounter
  • S55.199S Other specified injury of radial artery at forearm level, unspecified arm, sequela
  • S55.2 Injury of vein at forearm levelNon-billable
  • S55.20 Unspecified injury of vein at forearm levelNon-billable
  • S55.201 Unspecified injury of vein at forearm level, right armNon-billable
  • S55.201A Unspecified injury of vein at forearm level, right arm, initial encounter
  • S55.201D Unspecified injury of vein at forearm level, right arm, subsequent encounter
  • S55.201S Unspecified injury of vein at forearm level, right arm, sequela
  • S55.202 Unspecified injury of vein at forearm level, left armNon-billable
  • S55.202A Unspecified injury of vein at forearm level, left arm, initial encounter
  • S55.202D Unspecified injury of vein at forearm level, left arm, subsequent encounter
  • S55.202S Unspecified injury of vein at forearm level, left arm, sequela
  • S55.209 Unspecified injury of vein at forearm level, unspecified armNon-billable
  • S55.209A Unspecified injury of vein at forearm level, unspecified arm, initial encounter
  • S55.209D Unspecified injury of vein at forearm level, unspecified arm, subsequent encounter
  • S55.209S Unspecified injury of vein at forearm level, unspecified arm, sequela
  • S55.21 Laceration of vein at forearm levelNon-billable
  • S55.211 Laceration of vein at forearm level, right armNon-billable
  • S55.211A Laceration of vein at forearm level, right arm, initial encounter
  • S55.211D Laceration of vein at forearm level, right arm, subsequent encounter
  • S55.211S Laceration of vein at forearm level, right arm, sequela
  • S55.212 Laceration of vein at forearm level, left armNon-billable
  • S55.212A Laceration of vein at forearm level, left arm, initial encounter
  • S55.212D Laceration of vein at forearm level, left arm, subsequent encounter
  • S55.212S Laceration of vein at forearm level, left arm, sequela
  • S55.219 Laceration of vein at forearm level, unspecified armNon-billable
  • S55.219A Laceration of vein at forearm level, unspecified arm, initial encounter
  • S55.219D Laceration of vein at forearm level, unspecified arm, subsequent encounter
  • S55.219S Laceration of vein at forearm level, unspecified arm, sequela
  • S55.29 Other specified injury of vein at forearm levelNon-billable
  • S55.291 Other specified injury of vein at forearm level, right armNon-billable
  • S55.291A Other specified injury of vein at forearm level, right arm, initial encounter
  • S55.291D Other specified injury of vein at forearm level, right arm, subsequent encounter
  • S55.291S Other specified injury of vein at forearm level, right arm, sequela
  • S55.292 Other specified injury of vein at forearm level, left armNon-billable
  • S55.292A Other specified injury of vein at forearm level, left arm, initial encounter
  • S55.292D Other specified injury of vein at forearm level, left arm, subsequent encounter
  • S55.292S Other specified injury of vein at forearm level, left arm, sequela
  • S55.299 Other specified injury of vein at forearm level, unspecified armNon-billable
  • S55.299A Other specified injury of vein at forearm level, unspecified arm, initial encounter
  • S55.299D Other specified injury of vein at forearm level, unspecified arm, subsequent encounter
  • S55.299S Other specified injury of vein at forearm level, unspecified arm, sequela
  • S55.8 Injury of other blood vessels at forearm levelNon-billable
  • S55.80 Unspecified injury of other blood vessels at forearm levelNon-billable
  • S55.801 Unspecified injury of other blood vessels at forearm level, right armNon-billable
  • S55.801A Unspecified injury of other blood vessels at forearm level, right arm, initial encounter
  • S55.801D Unspecified injury of other blood vessels at forearm level, right arm, subsequent encounter
  • S55.801S Unspecified injury of other blood vessels at forearm level, right arm, sequela
  • S55.802 Unspecified injury of other blood vessels at forearm level, left armNon-billable
  • S55.802A Unspecified injury of other blood vessels at forearm level, left arm, initial encounter
  • S55.802D Unspecified injury of other blood vessels at forearm level, left arm, subsequent encounter
  • S55.802S Unspecified injury of other blood vessels at forearm level, left arm, sequela
  • S55.809 Unspecified injury of other blood vessels at forearm level, unspecified armNon-billable
  • S55.809A Unspecified injury of other blood vessels at forearm level, unspecified arm, initial encounter
  • S55.809D Unspecified injury of other blood vessels at forearm level, unspecified arm, subsequent encounter
  • S55.809S Unspecified injury of other blood vessels at forearm level, unspecified arm, sequela
  • S55.81 Laceration of other blood vessels at forearm levelNon-billable
  • S55.811 Laceration of other blood vessels at forearm level, right armNon-billable
  • S55.811A Laceration of other blood vessels at forearm level, right arm, initial encounter
  • S55.811D Laceration of other blood vessels at forearm level, right arm, subsequent encounter
  • S55.811S Laceration of other blood vessels at forearm level, right arm, sequela
  • S55.812 Laceration of other blood vessels at forearm level, left armNon-billable
  • S55.812A Laceration of other blood vessels at forearm level, left arm, initial encounter
  • S55.812D Laceration of other blood vessels at forearm level, left arm, subsequent encounter
  • S55.812S Laceration of other blood vessels at forearm level, left arm, sequela
  • S55.819 Laceration of other blood vessels at forearm level, unspecified armNon-billable
  • S55.819A Laceration of other blood vessels at forearm level, unspecified arm, initial encounter
  • S55.819D Laceration of other blood vessels at forearm level, unspecified arm, subsequent encounter
  • S55.819S Laceration of other blood vessels at forearm level, unspecified arm, sequela
  • S55.89 Other specified injury of other blood vessels at forearm levelNon-billable
  • S55.891 Other specified injury of other blood vessels at forearm level, right armNon-billable
  • S55.891A Other specified injury of other blood vessels at forearm level, right arm, initial encounter
  • S55.891D Other specified injury of other blood vessels at forearm level, right arm, subsequent encounter
  • S55.891S Other specified injury of other blood vessels at forearm level, right arm, sequela
  • S55.892 Other specified injury of other blood vessels at forearm level, left armNon-billable
  • S55.892A Other specified injury of other blood vessels at forearm level, left arm, initial encounter
  • S55.892D Other specified injury of other blood vessels at forearm level, left arm, subsequent encounter
  • S55.892S Other specified injury of other blood vessels at forearm level, left arm, sequela
  • S55.899 Other specified injury of other blood vessels at forearm level, unspecified armNon-billable
  • S55.899A Other specified injury of other blood vessels at forearm level, unspecified arm, initial encounter
  • S55.899D Other specified injury of other blood vessels at forearm level, unspecified arm, subsequent encounter
  • S55.899S Other specified injury of other blood vessels at forearm level, unspecified arm, sequela
  • S55.9 Injury of unspecified blood vessel at forearm levelNon-billable
  • S55.90 Unspecified injury of unspecified blood vessel at forearm levelNon-billable
  • S55.901 Unspecified injury of unspecified blood vessel at forearm level, right armNon-billable
  • S55.901A Unspecified injury of unspecified blood vessel at forearm level, right arm, initial encounter
  • S55.901D Unspecified injury of unspecified blood vessel at forearm level, right arm, subsequent encounter
  • S55.901S Unspecified injury of unspecified blood vessel at forearm level, right arm, sequela
  • S55.902 Unspecified injury of unspecified blood vessel at forearm level, left armNon-billable
  • S55.902A Unspecified injury of unspecified blood vessel at forearm level, left arm, initial encounter
  • S55.902D Unspecified injury of unspecified blood vessel at forearm level, left arm, subsequent encounter
  • S55.902S Unspecified injury of unspecified blood vessel at forearm level, left arm, sequela
  • S55.909 Unspecified injury of unspecified blood vessel at forearm level, unspecified armNon-billable
  • S55.909A Unspecified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter
  • S55.909D Unspecified injury of unspecified blood vessel at forearm level, unspecified arm, subsequent encounter
  • S55.909S Unspecified injury of unspecified blood vessel at forearm level, unspecified arm, sequela
  • S55.91 Laceration of unspecified blood vessel at forearm levelNon-billable
  • S55.911 Laceration of unspecified blood vessel at forearm level, right armNon-billable
  • S55.911A Laceration of unspecified blood vessel at forearm level, right arm, initial encounter
  • S55.911D Laceration of unspecified blood vessel at forearm level, right arm, subsequent encounter
  • S55.911S Laceration of unspecified blood vessel at forearm level, right arm, sequela
  • S55.912 Laceration of unspecified blood vessel at forearm level, left armNon-billable
  • S55.912A Laceration of unspecified blood vessel at forearm level, left arm, initial encounter
  • S55.912D Laceration of unspecified blood vessel at forearm level, left arm, subsequent encounter
  • S55.912S Laceration of unspecified blood vessel at forearm level, left arm, sequela
  • S55.919 Laceration of unspecified blood vessel at forearm level, unspecified armNon-billable
  • S55.919A Laceration of unspecified blood vessel at forearm level, unspecified arm, initial encounter
  • S55.919D Laceration of unspecified blood vessel at forearm level, unspecified arm, subsequent encounter
  • S55.919S Laceration of unspecified blood vessel at forearm level, unspecified arm, sequela
  • S55.99 Other specified injury of unspecified blood vessel at forearm levelNon-billable
  • S55.991 Other specified injury of unspecified blood vessel at forearm level, right armNon-billable
  • S55.991A Other specified injury of unspecified blood vessel at forearm level, right arm, initial encounter
  • S55.991D Other specified injury of unspecified blood vessel at forearm level, right arm, subsequent encounter
  • S55.991S Other specified injury of unspecified blood vessel at forearm level, right arm, sequela
  • S55.992 Other specified injury of unspecified blood vessel at forearm level, left armNon-billable
  • S55.992A Other specified injury of unspecified blood vessel at forearm level, left arm, initial encounter
  • S55.992D Other specified injury of unspecified blood vessel at forearm level, left arm, subsequent encounter
  • S55.992S Other specified injury of unspecified blood vessel at forearm level, left arm, sequela
  • S55.999 Other specified injury of unspecified blood vessel at forearm level, unspecified armNon-billable
  • S55.999A Other specified injury of unspecified blood vessel at forearm level, unspecified arm, initial encounter
  • S55.999D Other specified injury of unspecified blood vessel at forearm level, unspecified arm, subsequent encounter
  • S55.999S Other specified injury of unspecified blood vessel at forearm level, unspecified arm, sequela

About the S55 Code Range

The ICD-10 code S55 section covers detailed classifications for injuries to blood vessels specifically at the forearm level. These codes are used to document various types of vascular injuries—including those affecting the ulnar artery, radial artery, veins, and other blood vessels—distinguishing by injury type, affected limb, and encounter stage.

Within this category, codes differentiate between unspecified injuries, lacerations, and other specified injuries to key vessels such as the ulnar artery (S55.0 series) and radial artery (S55.1 series). Coders will find further distinctions by laterality (right arm, left arm, or unspecified arm), and by encounter type such as initial, subsequent, or sequela (complications or conditions following an injury). For example, the ICD-10 code for ulnar artery injury varies from S55.009 (unspecified arm) to more precise codes like S55.011A, which specifies a laceration of the ulnar artery at the forearm level of the right arm during an initial encounter. Additionally, synonyms like “Ulnar blood vessel injury” are useful for recognizing these injuries when researching or coding.

This coding section aids healthcare professionals and medical coders in accurately capturing the nature, location, and timing of forearm blood vessel injuries, improving the specificity for clinical documentation and treatment tracking.

Questions About This Page

How many billable codes are in the S55 range?

Of the 201 codes in this range, 135 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.

What does the S55 range classify?

The range classifies injury of blood vessels at forearm level. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.

Related References

All ICD-10-CM ChaptersAll of Chapter 19ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes

Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.