O28.2Abnormal cytological finding on antenatal screening of mother

O28.2 is the ICD-10-CM diagnosis code for abnormal cytological finding on antenatal screening of mother. It belongs to category O28 (abnormal findings on antenatal screening of mother), block O20-O29 (other maternal disorders predominantly related to pregnancy) and chapter 15 (pregnancy, childbirth and the puerperium). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within O28 (abnormal findings on antenatal screening of mother), O28.2 is specifically for abnormal cytological finding on antenatal screening of mother. Related codes cover abnormal hematological finding on antenatal screening of mother (O28.0), abnormal biochemical finding on antenatal screening of mother (O28.1), abnormal ultrasonic finding on antenatal screening of mother (O28.3), abnormal radiological finding on antenatal screening of mother (O28.4), abnormal chromosomal and genetic finding on antenatal screening of mother (O28.5), other abnormal findings on antenatal screening of mother (O28.8) and unspecified abnormal findings on antenatal screening of mother (O28.9).

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.

The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 796.5 (abnormal finding on antenatal screening).