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 312 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, second trimester
 * O10.313 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, third trimester
 * O10.319 Pre-existing hypertensive heart and chronic kidney disease complicating pregnancy, unspecified trimester
 * O10.32 Pre-existing hypertensive heart and chronic kidney disease complicating childbirth
 * O10.33 Pre-existing hypertensive heart and chronic kidney disease complicating the puerperium
 * O10.4 Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium
 * Any condition in I15 specified as a reason for obstetric care during pregnancy, childbirth or the puerperium
 * Use additional code from I15 to identify the type of secondary hypertension
 * O10.41 Pre-existing secondary hypertension complicating pregnancy
 * O10.411 Pre-existing secondary hypertension complicating pregnancy, first trimester
 * O10.412 Pre-existing secondary hypertension complicating pregnancy, second trimester
 * O10.413 Pre-existing secondary hypertension complicating pregnancy, third trimester
 * O10.419 Pre-existing secondary hypertension complicating pregnancy, unspecified trimester
 * O10.42 Pre-existing secondary hypertension complicating childbirth
 * O10.43 Pre-existing secondary hypertension complicating the puerperium
 * O10.9 Unspecified pre-existing hypertension complicating pregnancy, childbirth and the puerperium
 * O10.91 Unspecified pre-existing hypertension complicating pregnancy
 * O10.911 Unspecified pre-existing hypertension complicating pregnancy, first trimester
 * O10.912 Unspecified pre-existing hypertension complicating pregnancy, second trimester
 * O10.913 Unspecified pre-existing hypertension complicating pregnancy, third trimester
 * O10.