O21

Excessive vomiting in pregnancy

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027

SourceCMS ICD-10-CM order file

ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

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

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.