S90.542A External constriction, left ankle, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S90.542 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 S90.542A

Back-references to S90

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

Nearby codes

• S90.541 External constriction, right ankle
• S90.541A External constriction, right ankle, initial encounter
• S90.541D External constriction, right ankle, subsequent encounter
• S90.541S External constriction, right ankle, sequela
• S90.542 External constriction, left ankle
• S90.542A External constriction, left ankle, initial encounter (this code)
• S90.542D External constriction, left ankle, subsequent encounter
• S90.542S External constriction, left ankle, sequela
• S90.549 External constriction, unspecified ankle
• S90.549A External constriction, unspecified ankle, initial encounter
• S90.549D External constriction, unspecified ankle, subsequent encounter