S85.012D Laceration of popliteal artery, left leg, subsequent encounter

Name of the Condition

• Laceration of popliteal artery, left leg, subsequent encounter

Summary

A laceration of the popliteal artery in the left leg is a traumatic injury involving a cut or tear to the blood vessel behind the left knee. This condition disrupts blood flow and may lead to complications such as ischemia, hemorrhage, or limb-threatening damage. The "subsequent encounter" designation indicates this is a follow-up visit for the injury, not the initial episode of care.

Causes

Direct trauma to the left popliteal artery, such as from penetrating injuries (e.g., knife wounds, gunshot), blunt force (e.g., fractures, severe contusions), or iatrogenic injury during surgical procedures near the left knee. Motor vehicle accidents, falls, or sports-related injuries are common mechanisms.

Risk Factors

• High-impact activities or occupations with exposure to left leg trauma.
• Preexisting vascular conditions that weaken arterial walls.
• Advanced age, which may reduce tissue elasticity.
• Use of anticoagulant medications increasing bleeding risk.

Symptoms

• Sudden pain or swelling behind the left knee.
• Weak or absent pulses in the left lower leg.
• Coolness, pallor, or numbness in the left foot or toes.
• Visible bruising or hematoma in the left popliteal area.
• Difficulty bearing weight or moving the left knee.

Diagnosis

Physical examination to assess pulses, skin temperature, and sensory function. Doppler ultrasound or angiography to evaluate blood flow and identify vessel damage. CT angiography or MRI may be used to assess surrounding tissues and confirm the extent of injury.

Treatment Options

Surgical repair of the lacerated artery, such as end-to-end anastomosis or bypass grafting, to restore blood flow. Anticoagulant therapy may be used to prevent clot formation. Pain management and monitoring for complications are standard. Physical therapy may be recommended during recovery.

Prognosis and Follow-Up

Prognosis depends on the severity of the injury, time to treatment, and presence of complications. Early intervention improves outcomes. Follow-up care includes monitoring for signs of infection, ischemia, or graft failure. Long-term surveillance may be necessary to assess vascular function.

Complications

• Ischemia or tissue necrosis due to prolonged reduced blood flow.
• Hemorrhage or hematoma formation.
• Infection at the injury site.
• Graft failure or aneurysm formation after repair.
• Chronic pain or functional impairment.

Lifestyle & Prevention

Avoid high-risk activities without proper protection. Use seatbelts and protective gear during sports or work. Manage vascular conditions (e.g., hypertension, diabetes) to reduce arterial vulnerability. Promptly treat knee injuries to prevent progression.

When to Seek Professional Help

Seek immediate care for sudden severe pain, swelling, or discoloration behind the left knee. Contact a healthcare provider if pulses are weak or absent, or if numbness, coolness, or difficulty moving the leg occurs. Follow up as directed for post-treatment monitoring.

Tips for Medical Coders

Code S85.012D is used for a subsequent encounter of a left popliteal artery laceration. Document the laterality (left leg) and encounter type (subsequent) clearly. Include details on treatment provided and any complications to support coding accuracy. Ensure documentation aligns with the injury’s clinical course.