S81.042A Puncture wound with foreign body, left knee, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S81.042 with 7th character A (initial encounter).

Applies from S81 Open wound of knee and lower leg

Excludes1 (never code together)

• open fracture of knee and lower leg (S82.-)
• traumatic amputation of lower leg (S88.-)

Excludes2 (not included here)

• open wound of ankle and foot (S91.-)

Code also

• any associated wound infection

7th character note

• The appropriate 7th character is to be added to each code from category S81

7th character required

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

Code annotations containing back-references to S81.042A

Back-references to S81

• Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")
• Type 2 Excludes: S71 Open wound of hip and thigh ("open wound of knee and lower leg (S81.-)")
• Code Also: S84 Injury of nerves at lower leg level ("any associated open wound (S81.-)")
• Code Also: S85 Injury of blood vessels at lower leg level ("any associated open wound (S81.-)")
• Code Also: S86 Injury of muscle, fascia and tendon at lower leg level ("any associated open wound (S81.-)")

Diagnosis Index entries for S81.042A

• Puncture › knee › left › with foreign body

Nearby codes

• S81.041 Puncture wound with foreign body, right knee
• S81.041A Puncture wound with foreign body, right knee, initial encounter
• S81.041D Puncture wound with foreign body, right knee, subsequent encounter
• S81.041S Puncture wound with foreign body, right knee, sequela
• S81.042 Puncture wound with foreign body, left knee
• S81.042A Puncture wound with foreign body, left knee, initial encounter (this code)
• S81.042D Puncture wound with foreign body, left knee, subsequent encounter
• S81.042S Puncture wound with foreign body, left knee, sequela
• S81.049 Puncture wound with foreign body, unspecified knee
• S81.049A Puncture wound with foreign body, unspecified knee, initial encounter
• S81.049D Puncture wound with foreign body, unspecified knee, subsequent encounter