O28 vs R83
O28 (Abnormal findings on antenatal screening of mother) compared with R83 (Abnormal findings in cerebrospinal fluid), 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. R83 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 | R83Abnormal findings in cerebrospinal fluid | |
|---|---|---|
| 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 cerebrospinal fluid is a non-billable ICD-10-CM category code (R83). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources