O21.0

ICD-10Billable

Mild hyperemesis gravidarum

Official ICD-10-CM descriptor (FY2026)

Mild hyperemesis gravidarum

O21.0 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Hyperemesis gravidarum, mild or unspecified, starting before the end of the 20th week of gestation

Related codes in O21

Where this code sits

Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: Other maternal disorders predominantly related to pregnancy (O20-O29)
Parent code: O21

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.