A52.75 Syphilis of kidney and ureter

Name of the Condition

• Syphilis of kidney and ureter

Summary

Syphilis of kidney and ureter is a late-stage manifestation of syphilis infection, occurring years after initial exposure, that specifically affects the kidney and ureteral tissues. It results from untreated or inadequately treated earlier stages of the disease and can involve inflammatory or destructive changes in these structures, potentially leading to functional impairment or complications.

Causes

Syphilis of kidney and ureter is caused by the bacterium Treponema pallidum. It develops when the infection progresses untreated through primary, secondary, and latent stages, allowing the bacteria to invade and damage kidney and ureteral tissues in the tertiary phase. The condition arises due to the persistence of the infection and the body's immune response to the bacteria over time.

Risk Factors

• Untreated or inadequately treated syphilis
• Prolonged latency period without medical intervention
• Immune system compromise (e.g., HIV infection)
• High-risk sexual behaviors or exposure to infected individuals

Symptoms

• Urinary: hematuria (blood in urine), dysuria (painful urination), or urinary frequency
• General: fatigue, weight loss, or low-grade fever
• Localized: flank pain or renal dysfunction due to kidney involvement

Diagnosis

Diagnosis involves serologic testing for syphilis, such as nontreponemal (e.g., RPR, VDRL) and treponemal (e.g., FTA-ABS, TPPA) tests, to confirm active infection. Urinalysis may show hematuria or proteinuria, and imaging (e.g., ultrasound, CT) can assess structural changes in the kidney or ureter. Biopsy may be considered in atypical cases to rule out other conditions.

Treatment Options

Treatment typically involves intramuscular or intravenous penicillin, the preferred antibiotic for syphilis, administered according to CDC guidelines based on disease stage and patient factors. Follow-up serologic testing is recommended to monitor treatment response. Adjunctive therapies may address symptoms (e.g., pain management) or complications (e.g., renal support).

Prognosis and Follow-Up

With appropriate antibiotic treatment, prognosis is generally good, though residual damage from late-stage infection may persist. Regular follow-up serologic testing (e.g., at 6, 12, and 24 months) is essential to confirm cure and detect reinfection. Patients with renal impairment may require ongoing monitoring of kidney function.

Complications

• Chronic kidney disease or renal failure due to tissue destruction
• Ureteral strictures or obstruction
• Increased risk of other infections or systemic complications from untreated syphilis

Lifestyle & Prevention

• Practice safe sex (e.g., consistent condom use) to reduce exposure risk
• Get tested for syphilis if sexually active or at high risk
• Complete prescribed antibiotic courses to prevent progression
• Avoid sharing needles or other drug paraphernalia

When to Seek Professional Help

Seek medical care if you experience persistent urinary symptoms (e.g., blood in urine, pain), unexplained fatigue, or signs of infection (e.g., fever) after potential syphilis exposure. Early evaluation is critical to prevent irreversible organ damage.

Tips for Medical Coders

Code A52.75 is specific to syphilis affecting the kidney and ureter. Document the anatomical involvement clearly, as this code excludes other organ systems. Ensure clinical correlation with serologic testing and imaging to support the diagnosis. Do not use this code for latent or asymptomatic syphilis; it applies only to symptomatic late-stage disease with documented renal/ureteral involvement.