All ICD10 Codes

O21

Non-Billable
ChapterO00–O9A
Rankcategory
Official Description

Excessive vomiting in pregnancy

Use a more specific code (5 billable)
O21.0Mild hyperemesis gravidarumO21.1Hyperemesis gravidarum with metabolic disturbanceO21.2Late vomiting of pregnancyO21.8Other vomiting complicating pregnancyO21.9Vomiting of pregnancy, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A).

CH15 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • supervision of normal pregnancy (Z34.-)
Excludes2(Not included here. Code separately if applicable.)
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)
Use Additional Code
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

O20-O29 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  • maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)

Clinical Hierarchy

BillableHas subcodes
CH15Pregnancy, childbirth and the puerperium (O00-O9A)
O20-O29Other maternal disorders predominantly related to pregnancy (O20-O29)
O21Excessive vomiting in pregnancyNot billable
O21.0Mild hyperemesis gravidarumBillable
O21.1Hyperemesis gravidarum with metabolic disturbanceBillable
O21.2Late vomiting of pregnancyBillable
O21.8Other vomiting complicating pregnancyBillable
O21.9Vomiting of pregnancy, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to O21:

blockO20-O29
Other maternal disorders predominantly related to pregnancy (O20-O29)
View context instructions
chapterCH15
Pregnancy, childbirth and the puerperium (O00-O9A)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Excessive vomiting in pregnancy.

Search PCS Codes