O22.23 Superficial thrombophlebitis in pregnancy, third trimester

Name of the Condition

• Superficial Thrombophlebitis in Pregnancy, Third Trimester (O22.23)

Summary

Superficial thrombophlebitis in pregnancy, third trimester, is a condition involving inflammation and clot formation in a superficial vein during the third trimester of pregnancy. It arises from venous stasis, hypercoagulability, and mechanical compression, and may present with localized pain, redness, and swelling. The condition is typically managed conservatively but requires monitoring to rule out progression to deep vein thrombosis.

Causes

The development of superficial thrombophlebitis in pregnancy, third trimester, is driven by increased venous stasis due to uterine compression of pelvic veins, hypercoagulability from pregnancy-related hormonal changes, and mechanical factors such as prolonged immobility. Inflammation of the vein wall often accompanies clot formation, contributing to symptoms.

Risk Factors

• Multiple pregnancies (e.g., twins or higher-order multiples).
• Prolonged standing or sitting.
• Pre-existing venous insufficiency or varicosities.
• Obesity or excessive weight gain during pregnancy.
• History of thromboembolic events.

Symptoms

• Localized pain, tenderness, or warmth along the affected vein.
• Redness or discoloration of the overlying skin.
• Swelling or hardening of the vein.
• Mild fever or systemic discomfort in severe cases.

Diagnosis

Diagnosis is typically clinical, based on physical examination findings of a tender, erythematous, palpable cord along a superficial vein. Ultrasound may be used to confirm the presence of a thrombus and rule out deep vein thrombosis. Laboratory tests, such as D-dimer, may be considered to assess for coagulation abnormalities, though results must be interpreted in the context of pregnancy.

Treatment Options

Treatment focuses on symptom relief and preventing complications. Conservative measures include leg elevation, warm compresses, and nonsteroidal anti-inflammatory drugs (NSAIDs) if not contraindicated. Compression stockings may be recommended to improve venous return. Anticoagulation is generally not required unless there is extension to the deep venous system or other risk factors for thromboembolism.

Prognosis and Follow-Up

The prognosis is generally favorable with appropriate management. Most cases resolve without serious complications, though recurrence or progression to deep vein thrombosis is possible. Follow-up may involve monitoring for symptom improvement and repeat imaging if deep vein thrombosis is suspected. Patients should be educated on recognizing worsening symptoms and the importance of adherence to preventive measures.

Complications

• Extension of the thrombus to the deep venous system, leading to deep vein thrombosis.
• Pulmonary embolism, though rare with superficial thrombophlebitis alone.
• Post-thrombotic syndrome, characterized by chronic pain, swelling, or skin changes.
• Superficial tissue necrosis in severe cases.

Lifestyle & Prevention

• Avoid prolonged standing or sitting; take regular breaks to move.
• Maintain a healthy weight and manage weight gain during pregnancy.
• Use compression stockings as recommended by a healthcare provider.
• Stay hydrated and engage in regular, gentle exercise (e.g., walking) to promote circulation.
• Elevate legs when resting to reduce venous pressure.

When to Seek Professional Help

Seek immediate medical attention if symptoms worsen, such as increased pain, swelling, or discoloration, or if signs of deep vein thrombosis (e.g., unilateral leg swelling, chest pain, shortness of breath) develop. Prompt evaluation is necessary to rule out serious complications and initiate appropriate management.

Tips for Medical Coders

Code O22.23 is specific to superficial thrombophlebitis occurring in the third trimester of pregnancy. Documentation should clearly indicate the trimester and confirm the superficial nature of the thrombophlebitis. Ensure the diagnosis is supported by clinical findings, such as physical examination or imaging, and that there is no evidence of deep vein thrombosis or other complications that would require a different code.