1. ICD-10-CM Codes
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2. O00-O9A Pregnancy, childbirth and the puerperium
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3. O20-O29 Other maternal disorders predominantly related to pregnancy
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4. O21- Excessive vomiting in pregnancy
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5. 2021 ICD-10-CM Diagnosis Code O21.1

2021 ICD-10-CM Diagnosis Code O21.1

Hyperemesis gravidarum with metabolic disturbance

2016 2017 2018 2019 2020 2021 Billable/Specific Code Maternity Dx (12-55 years)

• O21.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2021 edition of ICD-10-CM O21.1 became effective on October 1, 2020.
• This is the American ICD-10-CM version of O21.1 - other international versions of ICD-10 O21.1 may differ.

• O21.1 is applicable to maternity patients aged 12 - 55 years inclusive.

• Hyperemesis gravidarum (excessive vomiting in pregnancy), severe
• Hyperemesis gravidarum (severe vomiting in pregnancy) with metabolic disturbance
• Severe hyperemesis gravidarum

• 817 Other antepartum diagnoses with o.r. Procedures with mcc
• 818 Other antepartum diagnoses with o.r. Procedures with cc
• 819 Other antepartum diagnoses with o.r. Procedures without cc/mcc
• 831 Other antepartum diagnoses without o.r. Procedures with mcc
• 832 Other antepartum diagnoses without o.r. Procedures with cc
• 833 Other antepartum diagnoses without o.r. Procedures without cc/mcc

Convert O21.1 to ICD-9-CM

• 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
• 2021 (effective 10/1/2020): No change

• Type 1 Excludes: E87
  ICD-10-CM Diagnosis Code E87

  Other disorders of fluid, electrolyte and acid-base balance

  2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code

  Type 1 Excludes

  • diabetes insipidus (E23.2)
  • electrolyte imbalance associated with hyperemesis gravidarum (O21.1)
  • electrolyte imbalance following ectopic or molar pregnancy (O08.5)
  • familial periodic paralysis (G72.3)

• Hyperemesis R11.10
  ICD-10-CM Diagnosis Code R11.10

  Vomiting, unspecified

  2016 2017 2018 2019 2020 2021 Billable/Specific Code

  Applicable To

  • Vomiting NOS
  • gravidarum (mild) O21.0
    ICD-10-CM Diagnosis Code O21.0

    Mild hyperemesis gravidarum

    2016 2017 2018 2019 2020 2021 Billable/Specific Code Maternity Dx (12-55 years)

    Applicable To

    • Hyperemesis gravidarum, mild or unspecified, starting before the end of the 20th week of gestation
    • with
      • carbohydrate depletion O21.1
      • dehydration O21.1
      • electrolyte imbalance O21.1
      • metabolic disturbance O21.1
    • severe O21.1 (with metabolic disturbance)
• Imbalance R26.89
  ICD-10-CM Diagnosis Code R26.89

  Other abnormalities of gait and mobility

  2016 2017 2018 2019 2020 2021 Billable/Specific Code
  • electrolyte E87.8
    ICD-10-CM Diagnosis Code E87.8

    Other disorders of electrolyte and fluid balance, not elsewhere classified

    2016 2017 2018 2019 2020 2021 Billable/Specific Code

    Applicable To

    • Electrolyte imbalance NOS
    • Hyperchloremia
    • Hypochloremia
    • due to hyperemesis gravidarum O21.1

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