S20.343A External constriction of bilateral front wall of thorax, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S20.343 with 7th character A (initial encounter).

Applies from S20 Superficial injury of thorax

7th character note

• The appropriate 7th character is to be added to each code from category S20

7th character required

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

Nearby codes

• S20.342 External constriction of left front wall of thorax
• S20.342A External constriction of left front wall of thorax, initial encounter
• S20.342D External constriction of left front wall of thorax, subsequent encounter
• S20.342S External constriction of left front wall of thorax, sequela
• S20.343 External constriction of bilateral front wall of thorax
• S20.343A External constriction of bilateral front wall of thorax, initial encounter (this code)
• S20.343D External constriction of bilateral front wall of thorax, subsequent encounter
• S20.343S External constriction of bilateral front wall of thorax, sequela
• S20.344 External constriction of middle front wall of thorax
• S20.344A External constriction of middle front wall of thorax, initial encounter
• S20.344D External constriction of middle front wall of thorax, subsequent encounter