Abnormal findings on antenatal screening of mother (O28) ICD-10-CM
The O28 code range covers abnormal findings on antenatal screening of mother with 9 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- diagnostic findings classified elsewhere - see Alphabetical Index
Codes in the O28 Range 9 codes · 8 billable
- O28 Abnormal findings on antenatal screening of motherNon-billable
- O28.0 Abnormal hematological finding on antenatal screening of mother
- O28.1 Abnormal biochemical finding on antenatal screening of mother
- O28.2 Abnormal cytological finding on antenatal screening of mother
- O28.3 Abnormal ultrasonic finding on antenatal screening of mother
- O28.4 Abnormal radiological finding on antenatal screening of mother
- O28.5 Abnormal chromosomal and genetic finding on antenatal screening of mother
- O28.8 Other abnormal findings on antenatal screening of mother
- O28.9 Unspecified abnormal findings on antenatal screening of mother
About the O28 Code Range
These codes describe abnormal findings from screening a mother during pregnancy. The subdivisions separate findings by the kind of screening result.
O28.0 is for blood findings, O28.1 for body chemistry, and O28.2 for cell findings. Imaging findings are divided between ultrasound in O28.3 and radiology in O28.4. O28.5 identifies chromosomal or genetic findings. O28.8 is for other abnormal findings, while O28.9 is for unspecified abnormal findings.
Questions About This Page
How many billable codes are in the O28 range?
Of the 9 codes in this range, 8 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the O28 range classify?
The range classifies abnormal findings on antenatal screening of mother. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
