O28 vs R76

O28 (Abnormal findings on antenatal screening of mother) compared with R76 (Other abnormal immunological findings in serum), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. R76 carries an Excludes2 note covering O28: “abnormal findings on antenatal screening of mother (O28.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

	O28Abnormal findings on antenatal screening of mother	R76Other abnormal immunological findings in serum
Billing status	Non-billable header Report instead: O28.0, O28.1, O28.2, O28.3, O28.4	Non-billable header Report instead: R76.0, R76.11, R76.12, R76.81, R76.89
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).	Other abnormal immunological findings in serum is a non-billable ICD-10-CM category code (R76).

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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