2020 ICD-10-CM Diagnosis Code O21

Excessive vomiting in pregnancy

    2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
  • O21 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
  • The 2020 edition of ICD-10-CM O21 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of O21 - other international versions of ICD-10 O21 may differ.
The following code(s) above O21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to O21:
  • O00-O9A
    2020 ICD-10-CM Range O00-O9A

    Pregnancy, childbirth and the puerperium

    Note
    • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
    • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
    • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
    • 1st trimester- less than 14 weeks 0 days
    • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
    • 3rd trimester- 28 weeks 0 days until delivery
    Type 1 Excludes
    • supervision of normal pregnancy (Z34.-)
    Type 2 Excludes
    • 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 from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
    Pregnancy, childbirth and the puerperium
  • O20-O29
    2020 ICD-10-CM Range O20-O29

    Other maternal disorders predominantly related to pregnancy

    Type 2 Excludes
    • 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)
    Other maternal disorders predominantly related to pregnancy
Clinical Information
  • Intractable vomiting that develops in early pregnancy and persists. This can lead to dehydration and weight loss.
  • Severe, intractable vomiting during pregnancy (usually the first trimester) accompanied by dehydration, weight loss, and electrolyte imbalances.
Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to O21:
  • Type 1 Excludes: R11
    ICD-10-CM Diagnosis Code R11

    Nausea and vomiting

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • cyclical vomiting associated with migraine (G43.A-)
    • excessive vomiting in pregnancy (O21.-)
    • hematemesis (K92.0)
    • neonatal hematemesis (P54.0)
    • newborn vomiting (P92.0-)
    • psychogenic vomiting (F50.89)
    • vomiting associated with bulimia nervosa (F50.2)
    • vomiting following gastrointestinal surgery (K91.0)
ICD-10-CM Codes Adjacent To O21
O16.1 Unspecified maternal hypertension, first trimester
O16.2 Unspecified maternal hypertension, second trimester
O16.3 Unspecified maternal hypertension, third trimester
O16.4 Unspecified maternal hypertension, complicating childbirth
O16.5 Unspecified maternal hypertension, complicating the puerperium
O16.9 Unspecified maternal hypertension, unspecified trimester
O20 Hemorrhage in early pregnancy
O20.0 Threatened abortion
O20.8 Other hemorrhage in early pregnancy
O20.9 Hemorrhage in early pregnancy, unspecified
O21 Excessive vomiting in pregnancy
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
O22 Venous complications and hemorrhoids in pregnancy
O22.0 Varicose veins of lower extremity in pregnancy
O22.00 …… unspecified trimester
O22.01 …… first trimester
O22.02 …… second trimester

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.