O16
Header — not billableUnspecified maternal hypertension
The ICD-10 code for unspecified maternal hypertension is O16.
O16 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 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.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under O16
- O16.1Unspecified maternal hypertension, first trimester
- O16.2Unspecified maternal hypertension, second trimester
- O16.3Unspecified maternal hypertension, third trimester
- O16.4Unspecified maternal hypertension, complicating childbirth
- O16.5Unspecified maternal hypertension, complicating the puerperium
- O16.9Unspecified maternal hypertension, unspecified trimester
Related codes in this category
- O10Pre-existing hypertension complicating pregnancy, childbirth and the puerperiumnon-billable header
- O11Pre-existing hypertension with pre-eclampsianon-billable header
- O12Gestational [pregnancy-induced] edema and proteinuria without hypertensionnon-billable header
- O13Gestational [pregnancy-induced] hypertension without significant proteinurianon-billable header
- O14Pre-eclampsianon-billable header
- O15Eclampsianon-billable header
- O16Unspecified maternal hypertensionnon-billable header