S90.421A Blister (nonthermal), right great toe, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S90.421 with 7th character A (initial encounter).

Applies from S90 Superficial injury of ankle, foot and toes

7th character note

• The appropriate 7th character is to be added to each code from category S90

7th character required

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

Code annotations containing back-references to S90.421A

Back-references to S90

• Type 2 Excludes: S80 Superficial injury of knee and lower leg ("superficial injury of ankle and foot (S90.-)")

Nearby codes

• S90.416A Abrasion, unspecified lesser toe(s), initial encounter
• S90.416D Abrasion, unspecified lesser toe(s), subsequent encounter
• S90.416S Abrasion, unspecified lesser toe(s), sequela
• S90.42 Blister (nonthermal) of toe
• S90.421 Blister (nonthermal), right great toe
• S90.421A Blister (nonthermal), right great toe, initial encounter (this code)
• S90.421D Blister (nonthermal), right great toe, subsequent encounter
• S90.421S Blister (nonthermal), right great toe, sequela
• S90.422 Blister (nonthermal), left great toe
• S90.422A Blister (nonthermal), left great toe, initial encounter
• S90.422D Blister (nonthermal), left great toe, subsequent encounter