Diphtheritic cystitis

This code describes inflammation of the urinary bladder specifically caused by Corynebacterium diphtheriae, the bacterium responsible for diphtheria. It represents a rare manifestation of diphtheria affecting the genitourinary system, characterized by the formation of a pseudomembrane within the bladder.

Use this code when documentation clearly indicates a diagnosis of cystitis directly attributed to diphtheria. This typically requires laboratory confirmation of Corynebacterium diphtheriae in urine cultures or bladder tissue, along with clinical signs of bladder inflammation.

• Ensure documentation explicitly links the cystitis to diphtheria, not just a general infection.
• Code any underlying diphtheria infection (e.g., respiratory diphtheria) as the primary diagnosis if it is the causal condition.
• Do not confuse with other forms of bacterial cystitis; the diphtheritic etiology must be specified.