A18.5
Tuberculosis of eye
Clinical Classification Guidelines
Excludes Type 2
- lupus vulgaris of eyelid (A18.4)
Medical Intelligence & Overview
Tuberculosis of the eye is a rare form of extrapulmonary tuberculosis that affects the structures of the eye. Caused by the bacteria *Mycobacterium tuberculosis*, this condition can lead to vision problems and potential blindness if not diagnosed and managed appropriately. It often occurs in individuals with a history of tuberculosis elsewhere in the body, and its symptoms can mimic other eye diseases, making diagnosis challenging.
Causes & Symptoms
Clinical Causes: Spread of *Mycobacterium tuberculosis* bacteria from a primary lung infection or other TB-infected sites Hematogenous dissemination leading to infection within the eye Reactivation of dormant TB bacteria within ocular tissues Infection via contiguous spread from surrounding tissues Immunocompromised states, such as HIV/AIDS, increasing susceptibility
Key Symptoms: Blurred or decreased vision Eye redness and swelling Eye pain or discomfort Photophobia (sensitivity to light) Floaters or loss of peripheral vision Localized swelling or nodules on the eye surface In some cases, visible granulomas or lesions on the eye
Diagnostic & Treatment
Diagnosis Path: Diagnosis typically involves a comprehensive eye examination, medical history review, and laboratory testing. Tests may include tuberculin skin tests (Mantoux test), interferon-gamma release assays (IGRAs), ocular imaging such as slit-lamp examination, ocular ultrasound, and biopsy of ocular tissue when necessary. Additionally, chest X-rays or other imaging may be performed to identify concurrent tuberculosis infection elsewhere in the body.
Treatment Protocols: Treatment generally involves a prolonged course of anti-tuberculosis medications, which may include isoniazid, rifampicin, ethambutol, and pyrazinamide. The specific regimen is tailored based on the severity and extent of the infection. Regular monitoring during treatment is essential to assess response and manage potential side effects. In some cases, adjunct therapies such as corticosteroids are used to reduce inflammation and prevent tissue damage. Early diagnosis and management are crucial to preserve vision and prevent complications.
Clinical Advice & FAQs
Billing Guidance
Is A18.5 a billable ICD-10 code?
Yes, A18.5 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report A18.5?
Clinical documentation must specify the nature of Tuberculosis of eye and any associated comorbidities for accurate reporting.
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