Infections of bladder in pregnancy, third trimester

This code signifies a urinary tract infection specifically localized to the bladder (cystitis) occurring in a pregnant patient during her third trimester. It indicates an active infectious process affecting the lower urinary tract in the final stage of gestation.

Apply this code when documentation confirms a diagnosis of cystitis in a pregnant patient who is beyond 28 weeks of gestation. Supporting documentation includes positive urine culture results, urinalysis indicating infection, and physician notes specifying the trimester.

• Ensure the documentation explicitly states "third trimester" or provides gestational age indicating this period.
• Do not use this code for asymptomatic bacteriuria; a confirmed infection of the bladder is required.
• Sequence this code after the primary obstetric code (e.g., O09.xx for supervision of normal pregnancy) if the infection is a complication of the pregnancy.