Gestational proteinuria, first trimester

This code signifies the presence of proteinuria that develops during pregnancy, specifically identified within the first trimester. It indicates a renal manifestation of pregnancy, distinct from pre-existing kidney disease or pre-eclampsia.

Apply this code when a pregnant patient presents with new-onset proteinuria detected before the 14th week of gestation, without other signs or symptoms of pre-eclampsia or a history of chronic kidney disease. Documentation should clearly state the presence of proteinuria and the gestational age at diagnosis.

• Differentiate from pre-eclampsia (O14.x) which includes hypertension and other systemic signs.
• Ensure documentation specifies "first trimester" to support this specific code.
• Do not use if proteinuria is known to be pre-existing or due to a chronic renal condition.