O28 vs R94
O28 (Abnormal findings on antenatal screening of mother) compared with R94 (Abnormal results of function studies), 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. R94 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 | R94Abnormal results of function studies | |
|---|---|---|
| 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 results of function studies is a non-billable ICD-10-CM category code (R94). |
| Includes | — | abnormal results of radionuclide [radioisotope] uptake studies abnormal results of scintigraphy nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan] nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR] |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources