S45.109A Unspecified injury of brachial artery, unspecified side, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S45.109 with 7th character A (initial encounter).

Applies from S45 Injury of blood vessels at shoulder and upper arm level

Excludes2 (not included here)

• injury of subclavian artery (S25.1)
• injury of subclavian vein (S25.3)

Code also

• any associated open wound (S41.-)

7th character note

• The appropriate 7th character is to be added to each code from category S45

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S45.109A

Back-references to S45.1

• Type 2 Excludes: S55 Injury of blood vessels at forearm level ("injury of brachial vessels (S45.1-S45.2)")

Nearby codes

• S45.102 Unspecified injury of brachial artery, left side
• S45.102A Unspecified injury of brachial artery, left side, initial encounter
• S45.102D Unspecified injury of brachial artery, left side, subsequent encounter
• S45.102S Unspecified injury of brachial artery, left side, sequela
• S45.109 Unspecified injury of brachial artery, unspecified side
• S45.109A Unspecified injury of brachial artery, unspecified side, initial encounter (this code)
• S45.109D Unspecified injury of brachial artery, unspecified side, subsequent encounter
• S45.109S Unspecified injury of brachial artery, unspecified side, sequela
• S45.11 Laceration of brachial artery
• S45.111 Laceration of brachial artery, right side
• S45.111A Laceration of brachial artery, right side, initial encounter