Convert ICD-10-CM O21.1 to ICD-9-CM

ICD-10-CM O21.1 converts approximately to:
  • 2015 ICD-9-CM 643.13 Hyperemesis gravidarum with metabolic disturbance, antepartum condition or complication

Note: approximate conversions between ICD-9-CM codes and ICD-10-CM codes may require clinical interpretation in order to determine the most appropriate conversion code(s) for your specific coding situation.

Source: 2022 ICD-10-CM CMS General Equivalence Mappings.