O98.112 Syphilis complicating pregnancy, second trimester

Name of the Condition

• Syphilis complicating pregnancy, second trimester (ICD Code: O98.112)

Summary

This condition refers to syphilis infection that occurs during the second trimester of pregnancy. Syphilis, caused by Treponema pallidum, is a sexually transmitted infection that can affect both maternal and fetal health. Management during this stage requires specialized care to mitigate risks and prevent complications.

Causes

Syphilis complicating pregnancy is caused by infection with Treponema pallidum, typically transmitted through sexual contact or vertical transmission from mother to fetus. The infection may be newly acquired during pregnancy or represent a reactivation of latent disease.

Risk Factors

• Unprotected sexual activity with an infected partner
• Lack of prenatal syphilis screening
• History of syphilis or other sexually transmitted infections
• Substance use (e.g., intravenous drug use)
• Limited access to prenatal care

Symptoms

• Primary stage: Painless chancre (ulcer) at the infection site
• Secondary stage: Rash, fever, swollen lymph nodes, or mucous membrane lesions
• Latent stage: Asymptomatic but serologically positive
• Tertiary stage: Neurological or cardiovascular complications (rare in pregnancy)

Diagnosis

Diagnosis involves serological testing, including nontreponemal tests (e.g., RPR, VDRL) and confirmatory treponemal tests (e.g., FTA-ABS, TPPA). Prenatal screening is standard, and additional testing may be performed if exposure is suspected.

Treatment Options

• Penicillin G, the preferred treatment, administered according to stage and pregnancy trimester
• Follow-up serological testing to monitor response
• Partner notification and testing to prevent reinfection

Prognosis and Follow-Up

With timely treatment, maternal and fetal outcomes improve significantly. Follow-up includes serial serological testing to ensure treatment efficacy and monitor for reinfection. Untreated or inadequately treated syphilis can lead to severe complications.

Complications

• Congenital syphilis (if transmitted to the fetus)
• Preterm birth or stillbirth
• Neonatal death
• Maternal transmission to the fetus during pregnancy

Lifestyle & Prevention

• Consistent use of barrier protection during sexual activity
• Routine prenatal screening for syphilis
• Early treatment of infected partners
• Avoidance of high-risk sexual behaviors

When to Seek Professional Help

Seek care if symptoms of syphilis (e.g., sores, rash, or unexplained fever) occur during pregnancy, or if exposure to an infected partner is suspected. Prompt evaluation is critical to prevent transmission to the fetus.

Tips for Medical Coders

Document the trimester (second trimester) and confirm the syphilis diagnosis with supporting clinical or laboratory findings. Ensure the code aligns with the timing of infection and pregnancy stage for accurate reporting.