S40.821A Blister (nonthermal) of right upper arm, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S40.821 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

• S40.819A Abrasion of unspecified upper arm, initial encounter
• S40.819D Abrasion of unspecified upper arm, subsequent encounter
• S40.819S Abrasion of unspecified upper arm, sequela
• S40.82 Blister (nonthermal) of upper arm
• S40.821 Blister (nonthermal) of right upper arm
• S40.821A Blister (nonthermal) of right upper arm, initial encounter (this code)
• S40.821D Blister (nonthermal) of right upper arm, subsequent encounter
• S40.821S Blister (nonthermal) of right upper arm, sequela
• S40.822 Blister (nonthermal) of left upper arm
• S40.822A Blister (nonthermal) of left upper arm, initial encounter
• S40.822D Blister (nonthermal) of left upper arm, subsequent encounter