S90.423A Blister (nonthermal), unspecified great toe, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S90.423 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 S90.423A

Back-references to S90

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

Nearby codes

• S90.422 Blister (nonthermal), left great toe
• S90.422A Blister (nonthermal), left great toe, initial encounter
• S90.422D Blister (nonthermal), left great toe, subsequent encounter
• S90.422S Blister (nonthermal), left great toe, sequela
• S90.423 Blister (nonthermal), unspecified great toe
• S90.423A Blister (nonthermal), unspecified great toe, initial encounter (this code)
• S90.423D Blister (nonthermal), unspecified great toe, subsequent encounter
• S90.423S Blister (nonthermal), unspecified great toe, sequela
• S90.424 Blister (nonthermal), right lesser toe(s)
• S90.424A Blister (nonthermal), right lesser toe(s), initial encounter
• S90.424D Blister (nonthermal), right lesser toe(s), subsequent encounter