S20.321A Blister (nonthermal) of right front wall of thorax, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S20.321 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

• S20.319A Abrasion of unspecified front wall of thorax, initial encounter
• S20.319D Abrasion of unspecified front wall of thorax, subsequent encounter
• S20.319S Abrasion of unspecified front wall of thorax, sequela
• S20.32 Blister (nonthermal) of front wall of thorax
• S20.321 Blister (nonthermal) of right front wall of thorax
• S20.321A Blister (nonthermal) of right front wall of thorax, initial encounter (this code)
• S20.321D Blister (nonthermal) of right front wall of thorax, subsequent encounter
• S20.321S Blister (nonthermal) of right front wall of thorax, sequela
• S20.322 Blister (nonthermal) of left front wall of thorax
• S20.322A Blister (nonthermal) of left front wall of thorax, initial encounter
• S20.322D Blister (nonthermal) of left front wall of thorax, subsequent encounter