O28 – Abnormal findings on antenatal screening of mother

ICD-10-CM 2027 diagnosis code · Other maternal disorders predominantly related to pregnancy

Non-billable header

ICD-10-CM code O28

Code: O28 (claims format: O28)
Description: Abnormal findings on antenatal screening of mother
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O20-O29 Other maternal disorders predominantly related to pregnancy

Billable codes under O28

O28 is a header code and cannot be used on claims. Choose the most specific code:

Notes for O28

Excludes1 (not coded here):

diagnostic findings classified elsewhere - see Alphabetical Index

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block O20-O29

Excludes2 (not included here):

maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)

Frequently asked questions

What is ICD-10 code O28?

O28 is the ICD-10-CM code for abnormal findings on antenatal screening of mother, in the block O20-O29 (Other maternal disorders predominantly related to pregnancy).

Is O28 a billable code?

No. O28 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.