O28.4 — Abnormal radiological finding on antenatal screening of mother
O28.4 is a billable, specific ICD-10-CM code for abnormal radiological finding on antenatal screening of mother. It is valid for submission on a claim.
Excludes1 inherited from the categories above O28.4
These are not written on O28.4, but they bind it: a note on a category applies to every code beneath it. Billing O28.4 with anything listed here is a denial.
Written on O28 — Abnormal findings on antenatal screening of mother
- diagnostic findings classified elsewhere - see Alphabetical Index
Risk adjustment
O28.4 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
O28.4 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A55326Billing and Coding: Zika Virus Testing by PCR and ELISA Methods
How O28.4 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to O28.4.
- Findings, abnormal, inconclusive, without diagnosis›antenatal screening of mother›radiological
- Pregnancy›complicated by›abnormal, abnormality›findings on antenatal screening of mother›radiological
Code history
O28.4 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share O28. If O28.4 is not quite right, the correct code is usually one of these.
- O28.0Abnormal hematological finding on antenatal screening of mother
- O28.1Abnormal biochemical finding on antenatal screening of mother
- O28.2Abnormal cytological finding on antenatal screening of mother
- O28.3Abnormal ultrasonic finding on antenatal screening of mother
- O28.5Abnormal chromosomal and genetic finding on antenatal screening of mother
- O28.8Other abnormal findings on antenatal screening of mother
- O28.9Unspecified abnormal findings on antenatal screening of mother
Questions about O28.4
- Is O28.4 a billable ICD-10-CM code?
- Yes. O28.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does O28.4 sit in the tabular list?
- Pregnancy, childbirth and the puerperium (O00-O9A), in the block Other maternal disorders predominantly related to pregnancy (O20-O29).
- What cannot be coded together with O28.4?
- O28.4 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above O28.4 (O28) and apply to it just the same.