S20.442A External constriction of left back wall of thorax, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S20.442 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

• S20.441 External constriction of right back wall of thorax
• S20.441A External constriction of right back wall of thorax, initial encounter
• S20.441D External constriction of right back wall of thorax, subsequent encounter
• S20.441S External constriction of right back wall of thorax, sequela
• S20.442 External constriction of left back wall of thorax
• S20.442A External constriction of left back wall of thorax, initial encounter (this code)
• S20.442D External constriction of left back wall of thorax, subsequent encounter
• S20.442S External constriction of left back wall of thorax, sequela
• S20.449 External constriction of unspecified back wall of thorax
• S20.449A External constriction of unspecified back wall of thorax, initial encounter
• S20.449D External constriction of unspecified back wall of thorax, subsequent encounter