Maternal hypotension syndrome, third trimester

This code represents a condition in pregnant individuals during their third trimester where the uterus compresses the inferior vena cava when lying supine, leading to a drop in blood pressure, dizziness, and other symptoms of reduced cardiac output. It is also known as supine hypotensive syndrome of pregnancy.

Apply this code when documentation clearly indicates a pregnant patient in their third trimester experiencing symptoms of hypotension (e.g., dizziness, nausea, pallor, syncope) that are relieved by changing position, particularly from a supine to a lateral recumbent position. Supporting documentation should describe the positional nature of the hypotension.

• Ensure the documentation specifies the third trimester; otherwise, consider other unspecified maternal hypotension codes if trimester is not documented.
• Do not confuse with general maternal hypotension not specifically linked to supine positioning or other causes of hypotension in pregnancy.
• Code any associated symptoms (e.g., R42 for dizziness, R11.0 for nausea) in addition to this diagnosis, if documented and clinically relevant.