O10.91
Header — not billableUnspecified pre-existing hypertension complicating pregnancy
The ICD-10 code for unspecified pre-existing hypertension complicating pregnancy is O10.91.
O10.91 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under O10.91
- O10.911Unspecified pre-existing hypertension complicating pregnancy, first trimester
- O10.912Unspecified pre-existing hypertension complicating pregnancy, second trimester
- O10.913Unspecified pre-existing hypertension complicating pregnancy, third trimester
- O10.919Unspecified pre-existing hypertension complicating pregnancy, unspecified trimester
Related codes in this category
- O10.92Unspecified pre-existing hypertension complicating childbirth
- O10.93Unspecified pre-existing hypertension complicating the puerperium
- O10.91Unspecified pre-existing hypertension complicating pregnancynon-billable header