I16 vs O10

I16 (Hypertensive crisis) compared with O10 (Pre-existing hypertension complicating pregnancy, childbirth and the puerperium), 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. I16 carries an Excludes2 note covering O10: “hypertensive disease complicating pregnancy, childbirth and the puerperium (O10-O11, O13-O16)”

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

Side by side

	I16Hypertensive crisis	O10Pre-existing hypertension complicating pregnancy, childbirth and the puerperium
Billing status	Non-billable header Report instead: I16.0, I16.1, I16.9	Non-billable header Report instead: O10.011, O10.012, O10.013, O10.019, O10.02
Classification	I00-I99 — Diseases of the Circulatory System (I00-I99)	O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
Definition	Hypertensive crisis is a non-billable ICD-10-CM category code (I16).	Pre-existing hypertension complicating pregnancy, childbirth and the puerperium is a non-billable ICD-10-CM category code (O10).
Includes	—	pre-existing hypertension with pre-existing proteinuria complicating pregnancy, childbirth and the puerperium
Use additional code	code to identify: exposure to environmental tobacco smoke (Z77.22) history of tobacco dependence (Z87.891)	—

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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