O28 vs R80

O28 (Abnormal findings on antenatal screening of mother) compared with R80 (Proteinuria), 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. R80 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	R80Proteinuria
Billing status	Non-billable header Report instead: O28.0, O28.1, O28.2, O28.3, O28.4	Non-billable header Report instead: R80.0, R80.1, R80.2, R80.3, R80.8
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).	Proteinuria is a non-billable ICD-10-CM category code (R80).

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources