S81.859A Open bite, unspecified lower leg, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S81.859 with 7th character A (initial encounter).

Applies from S81 Open wound of knee and lower leg

Excludes1 (never code together)

• open fracture of knee and lower leg (S82.-)
• traumatic amputation of lower leg (S88.-)

Excludes2 (not included here)

• open wound of ankle and foot (S91.-)

Code also

• any associated wound infection

7th character note

• The appropriate 7th character is to be added to each code from category S81

7th character required

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

Applies from S81.85 Open bite of lower leg

Applicable to

• Bite of lower leg NOS

Excludes1 (never code together)

• superficial bite of lower leg (S80.86-, S80.87-)

Code annotations containing back-references to S81.859A

Back-references to S81.85

• Type 1 Excludes: S80.87 Other superficial bite of lower leg ("open bite of lower leg (S81.85-)")

Back-references to S81

• Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")
• Type 2 Excludes: S71 Open wound of hip and thigh ("open wound of knee and lower leg (S81.-)")
• Code Also: S84 Injury of nerves at lower leg level ("any associated open wound (S81.-)")
• Code Also: S85 Injury of blood vessels at lower leg level ("any associated open wound (S81.-)")
• Code Also: S86 Injury of muscle, fascia and tendon at lower leg level ("any associated open wound (S81.-)")

Nearby codes

• S81.852 Open bite, left lower leg
• S81.852A Open bite, left lower leg, initial encounter
• S81.852D Open bite, left lower leg, subsequent encounter
• S81.852S Open bite, left lower leg, sequela
• S81.859 Open bite, unspecified lower leg
• S81.859A Open bite, unspecified lower leg, initial encounter (this code)
• S81.859D Open bite, unspecified lower leg, subsequent encounter
• S81.859S Open bite, unspecified lower leg, sequela