ICD-10 code for gravidarum mild hyperemesis

The ICD-10-CM code for gravidarum mild hyperemesis is O21.0 (Mild hyperemesis gravidarum). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on O21.0.

Within O21 (excessive vomiting in pregnancy), O21.0 is specifically for mild hyperemesis gravidarum. Related codes cover hyperemesis gravidarum with metabolic disturbance (O21.1), late vomiting of pregnancy (O21.2), other vomiting complicating pregnancy (O21.8) and vomiting of pregnancy, unspecified (O21.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 817 (Other Antepartum Diagnoses with O.R. Procedures with MCC, relative weight 2.0534), DRG 818 (Other Antepartum Diagnoses with O.R. Procedures with CC, relative weight 1.2942), DRG 819 (Other Antepartum Diagnoses with O.R. Procedures without CC/MCC, relative weight 0.7739), DRG 831 (Other Antepartum Diagnoses without O.R. Procedures with MCC, relative weight 1.1558), DRG 832 (Other Antepartum Diagnoses without O.R. Procedures with CC, relative weight 0.7585) and DRG 833 (Other Antepartum Diagnoses without O.R. Procedures without CC/MCC, relative weight 0.5002), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.