Unspecified maternal hypertension, unspecified trimester

This code represents a diagnosis of high blood pressure occurring during pregnancy where the specific type of hypertension (e.g., gestational, pre-existing, pre-eclampsia) is not documented, and the trimester of onset or diagnosis is also unknown. It indicates a general hypertensive state in a pregnant patient without further clinical detail.

This code is appropriate when the medical record clearly states "maternal hypertension" or "hypertension in pregnancy" but lacks further specificity regarding the type of hypertension or the trimester. It should be used only when the provider's documentation does not allow for a more precise code from the O10-O15 series.

• Avoid using this code if documentation allows for a more specific code from categories O10-O15.
• Query the provider for clarification on the type of hypertension and trimester if possible.
• This code is often a last resort when documentation is insufficient for more specific coding.