P23 vs P35

P23 (Congenital pneumonia) compared with P35 (Congenital viral diseases), 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. P35 carries an Excludes2 note covering P23: “congenital pneumonia (P23.-)”

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

Side by side

	P23Congenital pneumonia	P35Congenital viral diseases
Billing status	Non-billable header Report instead: P23.0, P23.1, P23.2, P23.3, P23.4	Non-billable header Report instead: P35.0, P35.1, P35.2, P35.3, P35.4
Classification	P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)	P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)
Definition	Congenital pneumonia is a non-billable ICD-10-CM category code (P23).	Congenital viral diseases is a non-billable ICD-10-CM category code (P35).
Includes	infective pneumonia acquired in utero or during birth	infections acquired in utero or during birth

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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