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 919 Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester
 * O10.92 Unspecified pre-existing hypertension complicating childbirth
 * O10.93 Unspecified pre-existing hypertension complicating the puerperium

O11 Pre-existing hypertensive disorder with superimposed proteinuria

 * Includes: Conditions in Ol0 complicated by increased proteinuria
 * Superimposed pre-eclampsia
 * Use additional code from O10 to identify the type of hypertension
 * O11.1 Pre-existing hypertensive disorder with superimposed proteinuria, first trimester
 * O11.2 Pre-existing hypertensive disorder with superimposed proteinuria, second trimester
 * O11.3 Pre-existing hypertensive disorder with superimposed proteinuria, third trimester
 * O11.9 Pre-existing hypertensive disorder with superimposed proteinuria, unspecified trimester

O12 Gestational [pregnancy-induced] edema and proteinuria without hypertension

 * O12.0 Gestational edema
 * O12.00 Gestational edema, unspecified trimester
 * O12.01 Gestational edema, first trimester
 * O12.02 Gestational edema, second trimester
 * O12.03 Gestational edema, third trimester
 * O12.1 Gestational proteinuria
 * O12.10 Gestational proteinuria, unspecified trimester
 * O12.11 Gestational proteinuria, first trimester
 * O12.12 Gestational proteinuria, second trimester
 * O12.13 Gestational proteinuria, third trimester
 * O12.2 Gestational edema with proteinuria
 * O12.20 Gestational edema with proteinuria, unspecified trimester
 * O12.21 Gestational edema with proteinuria, first trimester
 * O12.22 Gestational edema with proteinuria, second trimester
 * O12.23 Gestational edema with proteinuria, third trimester

O13 Gestational [pregnancy-induced] hypertension without significant proteinuria

 * Includes: gestational hypertension NOS
 * O13.1 Gestational [pregnancy-induced] hypertension without significant proteinuria, first trimester
 * O13.