Mild to moderate pre-eclampsia, third trimester

This diagnosis code signifies a hypertensive disorder of pregnancy characterized by new-onset hypertension and proteinuria, or hypertension with signs of organ dysfunction, occurring during the third trimester. The "mild to moderate" designation indicates the severity of the pre-eclampsia, falling between gestational hypertension and severe pre-eclampsia.

Apply this code when documentation confirms a diagnosis of pre-eclampsia with a severity specified as mild or moderate, and the patient is in her third trimester of pregnancy. Supporting documentation should include blood pressure readings, proteinuria levels (if applicable), and the gestational age at diagnosis.

• Differentiate carefully between mild/moderate and severe pre-eclampsia; the latter has distinct codes.
• Ensure the trimester is clearly documented, as pre-eclampsia can occur in other trimesters.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when complicating another condition.