Infections of kidney in pregnancy, third trimester

This code signifies a urinary tract infection specifically affecting the kidney (pyelonephritis) occurring in a pregnant patient during her third trimester. This condition can lead to serious maternal and fetal complications if not promptly treated.

Apply this code when documentation clearly indicates a diagnosis of pyelonephritis in a pregnant patient who is in her third trimester (typically defined as 28 weeks gestation to delivery). Supporting documentation would include physician notes detailing symptoms, diagnostic test results (e.g., urinalysis, urine culture), and gestational age.

• Always confirm the specific trimester documented by the provider.
• Do not use this code for lower urinary tract infections (e.g., cystitis) during pregnancy; use the appropriate O23.1- code.
• Sequence this code as a primary diagnosis when the pyelonephritis is the reason for the encounter, followed by codes for any associated organisms or complications.