Tuberculous iridocyclitis

This code signifies inflammation of both the iris and ciliary body of the eye, specifically caused by a Mycobacterium tuberculosis infection. It represents an ocular manifestation of tuberculosis, often indicating systemic involvement or a localized infection within the eye.

Use this code when documentation confirms iridocyclitis (anterior uveitis) and laboratory or clinical findings establish a tuberculous etiology. This diagnosis is typically supported by a positive tuberculin skin test (TST), interferon-gamma release assay (IGRA), or identification of M. tuberculosis from ocular fluid or tissue.

• Always code the underlying systemic tuberculosis infection first, if present and active, using codes from category A15-A19.
• Distinguish from other forms of iridocyclitis (e.g., viral, autoimmune) by ensuring the documentation explicitly states "tuberculous."
• If laterality is specified (e.g., right eye, left eye, bilateral), ensure the appropriate laterality subcode is used if available for the parent code.