S90.521A Blister (nonthermal), right ankle, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S90.521 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 S90.521A

Back-references to S90

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

Nearby codes

• S90.519A Abrasion, unspecified ankle, initial encounter
• S90.519D Abrasion, unspecified ankle, subsequent encounter
• S90.519S Abrasion, unspecified ankle, sequela
• S90.52 Blister (nonthermal) of ankle
• S90.521 Blister (nonthermal), right ankle
• S90.521A Blister (nonthermal), right ankle, initial encounter (this code)
• S90.521D Blister (nonthermal), right ankle, subsequent encounter
• S90.521S Blister (nonthermal), right ankle, sequela
• S90.522 Blister (nonthermal), left ankle
• S90.522A Blister (nonthermal), left ankle, initial encounter
• S90.522D Blister (nonthermal), left ankle, subsequent encounter