S91.359A Open bite, unspecified foot, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S91.359 with 7th character A (initial encounter).

Applies from S91 Open wound of ankle, foot and toes

Excludes1 (never code together)

• open fracture of ankle, foot and toes (S92.-with 7th character B)
• traumatic amputation of ankle and foot (S98.-)

Code also

• any associated wound infection

7th character note

• The appropriate 7th character is to be added to each code from category S91

7th character required

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

Applies from S91.35 Open bite of foot

Excludes1 (never code together)

• superficial bite of foot (S90.86-, S90.87-)

Code annotations containing back-references to S91.359A

Back-references to S91.35

• Type 1 Excludes: S90.87 Other superficial bite of foot ("open bite of foot (S91.35-)")

Back-references to S91

• Type 2 Excludes: S71 Open wound of hip and thigh ("open wound of ankle, foot and toes (S91.-)")
• Type 2 Excludes: S81 Open wound of knee and lower leg ("open wound of ankle and foot (S91.-)")
• Code Also: S94 Injury of nerves at ankle and foot level ("any associated open wound (S91.-)")
• Code Also: S95 Injury of blood vessels at ankle and foot level ("any associated open wound (S91.-)")
• Code Also: S96 Injury of muscle and tendon at ankle and foot level ("any associated open wound (S91.-)")

Nearby codes

• S91.352 Open bite, left foot
• S91.352A Open bite, left foot, initial encounter
• S91.352D Open bite, left foot, subsequent encounter
• S91.352S Open bite, left foot, sequela
• S91.359 Open bite, unspecified foot
• S91.359A Open bite, unspecified foot, initial encounter (this code)
• S91.359D Open bite, unspecified foot, subsequent encounter
• S91.359S Open bite, unspecified foot, sequela