Free Medical Coding > ICD10 CM > 2024 ICD-10-CM Codes > 2024 ICD-10-CM Codes O00-O9A – Pregnancy, childbirth and the puerperium (O00-O9A) > 2024 ICD-10-CM Codes O10-O16 – Edema, proteinuria and hypertensive disorders in pregnancy, childbirth and the puerperium (O10-O16) > 2024 ICD-10-CM Codes O10 – Pre-existing hypertension complicating pregnancy, childbirth and the puerperium (O10) > 2024 ICD-10-CM Codes O10.4 – Pre-existing secondary hypertension complicating pregnancy, childbirth and the puerperium (O10.4)