ICD-10-CM > O00-O9A > O20-O29 > O21 O21 Excessive vomiting in pregnancy Non-Billable/Non-Specific Codes O21.0Mild hyperemesis gravidarumO21.1Hyperemesis gravidarum with metabolic disturbanceO21.2Late vomiting of pregnancyO21.8Other vomiting complicating pregnancyO21.9Vomiting of pregnancy, unspecified