Unspecified maternal hypertension (O16)

The ICD-10 code O16 and its subcodes represent various types of unspecified maternal hypertension occurring during pregnancy, childbirth, and the postpartum period. These codes are used when a pregnant individual has high blood pressure without a more specific diagnosis.

The section covers unspecified high blood pressure during different stages: O16.1 for the first trimester, O16.2 for the second trimester, and O16.3 for the third trimester. It also includes codes for hypertension complicating childbirth (O16.4) and the puerperium, the period after childbirth (O16.5). The general code O16.9 applies when the trimester or specific timing is unspecified. Terms like “hypertension complicating pregnancy, childbirth and the puerperium” and “chronic hypertension in obstetric context” are synonymous with these codes. These ICD-10 codes help accurately document maternal hypertension without further detail, ensuring proper care and monitoring during pregnancy-related healthcare encounters. This understanding assists medical coders in selecting the correct ICD-10 code for maternal hypertension when precise details are unavailable.