S40.842A External constriction of left upper arm, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S40.842 with 7th character A (initial encounter).

Applies from S40 Superficial injury of shoulder and upper arm

7th character note

• The appropriate 7th character is to be added to each code from category S40

7th character required

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

Nearby codes

• S40.841 External constriction of right upper arm
• S40.841A External constriction of right upper arm, initial encounter
• S40.841D External constriction of right upper arm, subsequent encounter
• S40.841S External constriction of right upper arm, sequela
• S40.842 External constriction of left upper arm
• S40.842A External constriction of left upper arm, initial encounter (this code)
• S40.842D External constriction of left upper arm, subsequent encounter
• S40.842S External constriction of left upper arm, sequela
• S40.849 External constriction of unspecified upper arm
• S40.849A External constriction of unspecified upper arm, initial encounter
• S40.849D External constriction of unspecified upper arm, subsequent encounter