ICD-10-CM O21: Excessive vomiting in pregnancy

ICD-10-CM Diagnosis Code (2025)

Official Description for O21

Excessive vomiting in pregnancy

Coding Notes & Guidelines for O21

Use Additional Code

code, to identify cause.

Inclusion Terms

Hyperemesis gravidarum, mild or unspecified, starting before the end of the 20th week of gestation

Inclusion Terms
  • Hyperemesis gravidarum, starting before the end of the 20th week of gestation, with metabolic disturbance such as carbohydrate depletion
  • Hyperemesis gravidarum, starting before the end of the 20th week of gestation, with metabolic disturbance such as dehydration
  • Hyperemesis gravidarum, starting before the end of the 20th week of gestation, with metabolic disturbance such as electrolyte imbalance
Inclusion Terms

Excessive vomiting starting after 20 completed weeks of gestation

Inclusion Terms

Vomiting due to diseases classified elsewhere, complicating pregnancy

Child Codes (More Specific Codes for O21):

O21.0 - Mild hyperemesis gravidarum O21.1 - Hyperemesis gravidarum with metabolic disturbance O21.2 - Late vomiting of pregnancy O21.8 - Other vomiting complicating pregnancy O21.9 - Vomiting of pregnancy, unspecified

About ICD-10-CM Code O21 (Excessive vomiting in pregnancy)

ICD-10-CM code O21 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM O21 became effective on October 1, 2024.

This page provides detailed information about O21 - Excessive vomiting in pregnancy. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Excessive vomiting in pregnancy.