O21 ICD-10-CM Code: Excessive vomiting in pregnancy
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
O21Excessive vomiting in pregnancy
ICD-10-CM diagnosis code · United States clinical modification
Where O21 sits
- 1
Chapter 15
Pregnancy, childbirth and the puerperium (O00-O9A)
- 2
Section
Other maternal disorders predominantly related to pregnancy (O20-O29)
- 3
Category O21
Excessive vomiting in pregnancy
- 4
Code O21
Excessive vomiting in pregnancy
Codes under O21
O21 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for O21.
Code first
No “code first” instruction is listed for O21.
Use additional code
No “use additional code” instruction is listed for O21.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for O21.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for O21.
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code O21 mean?
O21 is the FY 2027 U.S. ICD-10-CM code for “Excessive vomiting in pregnancy.”
Is O21 a billable or specific ICD-10-CM code?
No. O21 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is O21 located in ICD-10-CM?
O21 is listed in Chapter 15, Pregnancy, childbirth and the puerperium (O00-O9A), within Other maternal disorders predominantly related to pregnancy (O20-O29) (O20–O29), under category O21, Excessive vomiting in pregnancy.
What coding notes are listed for O21?
No inclusion terms are listed for O21 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.