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Table 1 Definitions of hypertensive disorders of pregnancy

From: Korea hypertension fact sheet 2021: analysis of nationwide population-based data with special focus on hypertension in women

Diagnosis Definition
Chronic hypertension (A) Having insurance claims for diagnosis of (1) hypertension (ICD-10: I10-I15) before delivery, or (2) chronic maternal hypertension (ICD-10: O10) or preeclampsia superimposed on chronic hypertension (ICD-10: O11) before or within 12 weeks after delivery
Pregnancy-induced hypertension (B) Not meeting criteria for chronic hypertension; AND
Having insurance claims for diagnosis of gestational hypertension (ICD-10: O13) or preeclampsia/eclampsia (ICD-10: O14, O15) within 40 weeks before or 12 weeks after delivery
Unspecified hypertension (C) Not meeting criteria for chronic or pregnancy-induced hypertension; AND
Having insurance claims for diagnosis of unspecified maternal hypertension (ICD-10: O16) within 40 weeks before or 12 weeks after delivery
Preeclampsia/Eclampsia Having insurance claims for diagnosis of preeclampsia/eclampsia (ICD-10: O14, O15) or preeclampsia superimposed on chronic hypertension (ICD-10: O11) within 40 weeks before or 12 weeks after delivery
Hypertensive disorders of pregnancy A or B or C
  1. ICD-10, International Classification of Diseases, 10th revision