O16 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Unspecified maternal hypertension.
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Unspecified maternal hypertension, first trimester
Unspecified maternal hypertension, second trimester
Unspecified maternal hypertension, third trimester
Unspecified maternal hypertension, complicating childbirth
Unspecified maternal hypertension, complicating the puerperium
Unspecified maternal hypertension, unspecified trimester
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