Infections of kidney in pregnancy, first trimester

This code signifies a bacterial or other infectious process affecting the renal system (kidney) occurring during the initial three months of a pregnancy. It specifically identifies an infection such as pyelonephritis or a complicated urinary tract infection localized to the kidney in a pregnant patient.

Apply this code when a pregnant patient in her first trimester is diagnosed with a kidney infection. Documentation should clearly state the presence of a kidney infection and confirm the gestational age falling within the first trimester.

• Always sequence this code as the primary diagnosis when the kidney infection is the reason for the encounter.
• Ensure documentation specifies "first trimester" to accurately assign this code; otherwise, consider other O23.0x codes.
• Code any specific infectious organism identified (e.g., B95.x, B96.x) as an additional diagnosis.