I08 vs Q23

I08 (Multiple valve diseases) compared with Q23 (Congenital malformations of aortic and mitral valves), 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. I08 carries an Excludes2 note covering Q23: “multiple valve disease specified as nonrheumatic (I34.-, I35.-, I36.-, I37.-, I38.-, Q22.-, Q23.-, Q24.8-)”

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

Side by side

	I08Multiple valve diseases	Q23Congenital malformations of aortic and mitral valves
Billing status	Non-billable header Report instead: I08.0, I08.1, I08.2, I08.3, I08.8	Non-billable header Report instead: Q23.0, Q23.1, Q23.2, Q23.3, Q23.4
Classification	I00-I99 — Diseases of the Circulatory System (I00-I99)	Q00-Q99 — Congenital Malformations, Deformations and Chromosomal Abnormalities (Q00-Q99)
Definition	Multiple valve diseases is a non-billable ICD-10-CM category code (I08).	Congenital malformations of aortic and mitral valves is a non-billable ICD-10-CM category code (Q23).
Includes	multiple valve diseases specified as rheumatic or unspecified	—

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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