O28 vs R89
O28 (Abnormal findings on antenatal screening of mother) compared with R89 (Abnormal findings in specimens from other organs, systems and tissues), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. R89 carries an Excludes1 note covering O28: “abnormal findings on antenatal screening of mother (O28.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| O28Abnormal findings on antenatal screening of mother | R89Abnormal findings in specimens from other organs, systems and tissues | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Abnormal findings on antenatal screening of mother is a non-billable ICD-10-CM category code (O28). | Abnormal findings in specimens from other organs, systems and tissues is a non-billable ICD-10-CM category code (R89). |
| Includes | — | abnormal findings in nipple discharge abnormal findings in synovial fluid abnormal findings in wound secretions |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources